1350K

Group Standards Department ©

STANDARD en 1350 KPage Date Edition

2008-08-22 10 1 (19)

GENERAL TOLERANCES AND STANDARD REFERENCES

This standard endorses, for general tolerances, ISO 2768-1:1989 and ISO 2768-2:1989

Additions to ISO 2768-1:1989, see Table 1 and Table 2 (notes 1, 2, 3 and 4). For drawings with drawing owner “TOO”, see addition to ISO 2768-2:1989 in Table 6 (note 5).

CONTENTS Page 1 GENERAL....................................................................................................................................................................... 2 2 GENERAL TOLERANCES............................................................................................................................................. 2 2.1 GENERAL.......................................................................................................................................................................... 2 2.2 REJECTION ....................................................................................................................................................................... 3 2.3 LINEAR AND ANGULAR DIMENSIONS .................................................................................................................................... 3 2.3.1 Scope .............................................................................................................................................................................. 3 2.3.1.1 Linear dimensions ........................................................................................................................................................... 3 2.3.1.2 Angular dimensions......................................................................................................................................................... 4 2.4 GEOMETRICAL TOLERANCES.............................................................................................................................................. 4 2.4.1 Definitions ....................................................................................................................................................................... 5 2.4.2 Tolerances for single features......................................................................................................................................... 5 2.4.2.1 Straightness and flatness................................................................................................................................................ 5 2.4.2.2 Roundness ...................................................................................................................................................................... 5 2.4.2.3 Cylindricity....................................................................................................................................................................... 5 2.4.3 Tolerances for related features ....................................................................................................................................... 5 2.4.3.1 Parallelism....................................................................................................................................................................... 5 2.4.3.2 Perpendicularity .............................................................................................................................................................. 5 2.4.3.3 Symmetry ........................................................................................................................................................................ 6 2.4.3.4 Coaxiality......................................................................................................................................................................... 6 2.4.3.5 Circular run-out ............................................................................................................................................................... 6 2.4.4 Examples ........................................................................................................................................................................ 7 2.4.4.1 General ........................................................................................................................................................................... 7 2.4.4.2 Roundness ...................................................................................................................................................................... 8 2.4.4.3 Cylindricity....................................................................................................................................................................... 8 2.4.4.4 Parallelism....................................................................................................................................................................... 8 2.4.4.5 Symmetry ........................................................................................................................................................................ 9 2.4.4.6 Drawing example .......................................................................................................................................................... 10 2.4.4.7 Interpretation of drawing example................................................................................................................................. 10 2.4.5 Miscellaneous ............................................................................................................................................................... 11 3 GENERAL STANDARD REFERENCES...................................................................................................................... 11 3.1 GENERAL........................................................................................................................................................................ 11 3.1.1 Availability of standards ................................................................................................................................................ 11 3.1.2 ISO compared to AC-STD............................................................................................................................................. 12 3.2 LIST OF STANDARDS ........................................................................................................................................................ 12 3.2.1 Lines, arrows and dimensioning.................................................................................................................................... 12 3.2.2 Text ............................................................................................................................................................................... 12 3.2.3 Project methods ............................................................................................................................................................ 12 3.2.4 Views and sections ....................................................................................................................................................... 12 3.2.5 Item references ............................................................................................................................................................. 13 3.2.6 Quantities and units ...................................................................................................................................................... 13 3.2.7 Symbols ........................................................................................................................................................................ 13 3.2.8 Components and characteristics................................................................................................................................... 13 3.2.9 Dimensioning and tolerancing....................................................................................................................................... 14 3.2.10 Geometrical tolerancing ................................................................................................................................................ 14 3.2.11 Surface texture.............................................................................................................................................................. 14 3.2.12 Document handling ....................................................................................................................................................... 15 3.3 EXAMPLES OF DRAWING INDICATIONS............................................................................................................................... 15 3.3.1 General standard references ........................................................................................................................................ 15 3.3.2 Non general standard references.................................................................................................................................. 16 4 INDICATION ON DRAWINGS...................................................................................................................................... 17 4.1 GENERAL STANDARD REFERENCES ONLY ......................................................................................................................... 17 4.2 LINEAR AND ANGULAR DIMENSIONS .................................................................................................................................. 17 4.3 DIMENSIONAL TOLERANCES AND GEOMETRICAL TOLERANCES ........................................................................................... 17 4.4 GEOMETRICAL TOLERANCES ONLY ................................................................................................................................... 17 4.5 BOTH DIMENSIONAL, GEOMETRICAL AND ENVELOPE REQUIREMENTS.................................................................................. 17

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5 OLDER DRAWING INDICATIONS............................................................................................................................... 18 5.1 LINEAR MEASURES .......................................................................................................................................................... 18 5.2 ROUNDING-OFF RADII AND CHAMFERS .............................................................................................................................. 18 5.3 ANGULAR DIMENSIONS .................................................................................................................................................... 18 5.4 OLD METHODS OF INDICATION.......................................................................................................................................... 19 5.4.1 One tolerance class ...................................................................................................................................................... 19 5.4.2 Different tolerance classes............................................................................................................................................ 19


STANDARD en 1350 K 2008-08-22 10 2 (19)

Date Edition Page

These advantages are fully obtained only when there is sufficient reliability that the general tolerances will not be exceeded, i.e. when the customary workshop accuracy of the particular workshop is equal to or finer than the general tolerances indicated in the drawing.

1 GENERAL General tolerances should be stated whenever required, with a reference to AC-STD 1350 K, with ISO tolerance class (-es) added, according to paragraph 2, page 2 for linear and angular dimensions and paragraph 2.4, page 4 for geometrical tolerances.

Reference to AC-STD 1350 K, without stating of tolerance class, means that general standards under paragraph 3, page 11 can be applied on a drawing without any reference stated.

ISO 2768-1:1989 and ISO 2768-2:1989 mainly applies to features produced by material removal or formed from sheet metal.

For indications on drawings, see example under paragraph 4, page 16.

2 GENERAL TOLERANCES

2.1 General All features on component parts always have a size and a geometrical shape. For the deviation of size and for the deviations of the geometrical characteristics (form, orientation and location) the function of the part requires limitations which, when exceeded, impair this function.

General tolerances are tolerances which shall apply where no other tolerances have been indicated. This standard mainly applies to features which are manufactured by removal of material.

If there are general tolerances for other processes, as specified in other standards, reference shall be made to them on the drawings or associated specifications. For a dimension between an unfinished and a finished surface, e.g. of cast or forged parts, for which no individual tolerance is directly indicated, the larger of the two general tolerances in question applies.

The tolerancing on the drawing should be complete to ensure that the elements of size and geometry of all features are controlled, i.e. nothing shall be implied or left to judgement in the workshop or in the inspection department.

The use of general tolerances for size and geometry simplifies the task of ensuring that this prerequisite is met.

ISO tolerance class (classes) for general tolerances should be used when the values in question correspond to the customary workshop accuracy. If tighter limits are required, or if larger deviations are permitted, the tolerances should be indicated directly on the drawing.

When selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration. If smaller tolerances are required or larger tolerances are permissible and more economical for any individual feature, such tolerances should be indicated adjacent to the relevant nominal dimension (s).

The use of general tolerances provides the following advantages:

a) drawings are easier to read and thus communication is made more effective to the user of the drawing.

b) the design draughtsman saves time by avoiding detailed tolerance calculations. It is sufficient enough to know that the function allows a tolerance greater than or equal to the general tolerance.

c) the drawing readily indicates which feature can be produced by normal process capability. d) assists quality engineering by reducing inspection levels. e) those dimensions remaining, which have individually indicated tolerances, will, for the most part,

be those controlling features for which the function requires relatively small tolerances. This will be helpful for production planning and will assist quality control services in their analysis of inspection requirements.

f) purchase and sub-contract supply engineers can negotiate orders more readily since the “customary workshop accuracy” is known before the contract is placed. This also avoids discrepancies on delivery between the buyer and the supplier, since in this respect the drawing is complete.


STANDARD en 1350 K 2008-08-22 10 3 (19)

Date Edition Page

its customary

curacy does not deteriorate.

2.2 The tolerance which the function allows is often greater than the general tolerance. The function of the part is, therefore, not always impaired when the general tolerance is (occasionally)

d at any feature of the work-piece. Exceeding the general tolerance should lead to a

2.3 Linea

specifications refer to ISO tolerance classes f, m, c or v (ISO 2768-1:1989). raph 4, page 16.

2.3.1 Scope ap imensions without individual

tolerance indications in four tolerance classes.

rd applies to the dimensions of parts that are produced by metal removal or parts

following dimensions which do not have an

sizes, internal sizes, step sizes, diameters, radii, distances,

g angular dimensions usually not indicated, e.g. right angles (90⁰),

assembled parts.

rds on general tolerances.

2.3.1.1 Values in millimetres.

ear dimensions except for broken edges, see also table 2).

class

The workshop should, therefore:

– measure and determine the workshop accuracy. – accept only those drawings having general tolerances equal to or greater than

workshop accuracy. – check by sampling that its customary workshop ac

Rejection

exceederejection of the work-piece only if the function is impaired.

r and angular dimensions General tolerances for linear and angular dimensions apply when drawings or belonging

NOTE: For drawing indications, see parag For older tolerance classes (1, 2, 3, and 4), see paragraph 5, page 17.

P h 2.3 specifies general tolerances for linear and angular daragr

The standathat are formed from sheet metal.

This part of AC STD 1350 K only applies for the individual tolerance indication:

a) linear dimensions, e.g. externalexternal radii and chamfer heights for broken edges.

b) angular dimensions, includinunless reference to AC-STD 1350 K paragraph 2.4 is made, or angles of uniform polygons.

c) linear and angular dimensions produced by machining The standard does not apply for the following dimensions:

a) linear and angular dimensions which are covered by reference to other standa

b) auxiliary dimensions indicated in brackets. c) theoretically exact dimensions indicated in rectangular frames.

Linear dimensions General tolerances for linear dimensions are given in tables 1 and 2.

Table 1. Permissible deviations for linTolerance Permissible deviations for basic size range

De-si De- >3 >6 >30 >120 >400 >1000 >2000 >4000 >8000 >12000 g--a- scrip-

tion ntion

-31) -6 -30 -120 120002) -160002) >16000

-200002) -400 -1000 -2000 -4000 -80002) -

f fine ±0,05 ± ± ±0,05 0,1 0,15 ±0,2 ±0,3 ±0,5 – – – – –

m medium ± ±0,1 0,1 ±0,2 ±0,3 ±0,5 ±0,8 ±1,2 ±2 ±3 ±4 ±5 ±6

c c oarse ±0,2 ±0,3 ±0,5 ±0,8 ±1,2 ±2 ±3 ±4 ±5 ±6 ±7 ±8

v very coarse – ±0,5 ±1 ±1,5 ±2,5 ±4 ±6 ±8 ±8 ±10 ±12 ±12

1) In ISO 2768- , s d s all sic s the and way t be indicated for smaller basic sizes. ver, he Atlas Copco group, it has been indicated deviations are applicable also for basic sizes smaller than 0,5 mm, in order to facilitate the interpretation of older drawings.

2) Not included in ISO 2768-1:1989, but constitutes a Swedish addition in SS-ISO 2768-1:1990.

1:1989 0 5 mm ha been inHowe

icated awithin t

the sm est ba ize in table, decided t

also that individual tolerances alhat the

s mus


STANDARD en 1350 KDate Edition

2008-08-22 10 4 (19) Page

e range 4)

Table 2. Permissible deviations for broken edges (internal , external radii and chamfer heights) Note: If general requirements according to AC-STD 1436 K have been stated, those requirements apply.

3)

Tolerance class 4) Permissible deviations for basic sizDesignation Description 3) ≦3 4) >3-6 >6

f Fine m Medium

±0,2 ±0,5 ±1

c Coarse v Very coarse

±0,4 ±1 ±2

3) Internal radii and chamfer heights are cluded in ISO 1:1989, but w las Copco it h en decided to do that.

For sharp corners in grooves, witho imension, max allowed radius is 0,2 mm. For other sh rs, radius 0,4 mm is allowed. 4) In ISO 2768-1:1989 0,5 mm has been indicated as the smallest basic size in the table, and also that individual tolerances always must be

indicated for smaller basic sizes. Ho thin the Atla o group, it ha n decided that applicable also for basic sizes smaller than 0,5 mm, in order to facili interpretation der drawings. For new drawings, and for drawin d that, normally general, requirements according to AC-STD 1436 K

maximum distance b e shall be the least possible

not in 2768- ithin At as bearp corneut radius d

wever, wi s Copctate the

s bee of ol

the indicated deviations are

g modifications, it is recommendeare indicated for edges, corners, and when required, also for radii.

2.3.1.2 Angular dimensions General tolerances specified in angular units control only the general orientation of lines or line elements of surfaces, but not their form deviations. The general orientation of the line derived from the actual surface is the orientation of the contacting line of ideal geometrical form. The

etween the contacting line and the actual linvalue, see figure 1.

The permissible deviations of angular dimensions are given in table 3.

Contacting line

Figure 1. Example 45°angle.

Table 3. Permissible deviations imensions.

Tolerance class Permissible deviations for ranges llimeters, of the shorter side of e angle concerned

of angular d

of lengths in mi th

Designation 0-50 >50-120 >120-400 >400 Description -10 >1f fine m medium

±1° ±0°30’ ±0°20’ ±0°10’ ±0°5’

c coarse ±1°30’ ±1° ±0°30’ ±0°15’ ±0°10’ v very coarse ±3° ±2° ±1° ±0°30’ ±0°20’

2.4 Geometrical tolerances General geometrical tolerances a n dra gs or a ted spetoleran class H, ISO 2 989). apply ents that do not have individual geome cal tole tionsNote: For drawing indications, see paragraph 4, page 16.

When selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration. If smaller tolerances are required or larger tolerances are permissible

Contacting line Actual lines

4 deviations) 5⁰ (± Permissible

pply whe768-2:1

winThey

ssociato elem

cifications refer to ISO ce K or L (tri rance indica .



2008-08-22 10 5 (19) Page

or any individual feature, such tolerances should be indicated according

of any surface, angularity, coaxiality, positional tolerances

2.4.1 Dehis standard, the definitions given in AC-STD 4551 K and AC-STD 4552 K

2.4.2 To

2.4.2.1 Strance is selected from table 4, it shall be based, in the case of straightness, on the

eral tolerances on straightness and flatness.

htness and flatness tolerances for ranges of nominal length

and more economical fto AC-STD 4551 K.

General geometrical tolerances apply to all geometrical tolerance characteristics, excluding cylindricity, profile of any line, profileand total run-out.

General geometrical tolerances in accordance with this standard should always be indicated.

finitions For the purposes of tapply.

lerances for single features

aightness and flatness When a tolerlength of the corresponding line and, in the case of flatness, on the longer lateral length of the surface, or the diameter of the circular surface.

Table 4. Gen

StraigTolerance class

0 >10–30 >30–100 >100–300 >300–1000 >1000–3000 –1

H 0,02 0,05 0,1 0,2 0,3 0,4

K 0,05 0,1 0,2 0,4 0,6 0,8

L 0,1 0,2 0,4 0,8 1,2 1,6

2.4.2.2 Roundness T nc roun equal to the i nce, but in no case shall it be greate e respegiven in table 7, page ee als ple in paragraph 2.4.4.2, pa

2.4.2.3 Cylindricity General tolerances ar spec

dricity deviation comprises three components: roundness deviation, straightness deviation and

dual cylindricity tolerance in accordance with AC-STD 4551 K should be indicated for the feature concerned.

cases, e.g. in the case of a fit, the indication of the envelope requirement

he general tolera e on dness isr than th

numerical vnce valu

alue of the de for circul

ameter toleraar radial run-out ctive tolera

6. S o exam ge 8.

e not ified. Note: The cylin

parallelism deviation of opposite generator lines. Each of these components is controlled by its individually indicated tolerance or its general tolerance.

If, for functional reasons, the cylindricity deviation has to be smaller than the combined effect (see paragraph 2.4.4.3) of the general tolerances on roundness, straightness and parallelism, an indivi

In some is appropriate, see

2.4.3 ToThe .3.1 – 2.4.3.5 apply to all features, which are in relati

2.4.3.1 ParalleliThe or the flatne rance, whichever is greater. The longer of the two features shall be

tures are of equal nominal length, either may be taken as the

2.4.3.2 Pel tolerances on perpendicularity are given in table 5. The longer of the two sides right angle shall be taken as the datum. If the sides are of equal nominal length,

paragraph 4.5, page 17

lerances for related features tolerances specified in paragraph 2.4on to one another and which have no respective individual indication.

sm general tolerance on parallelism is equal to the numerical value of the size tolerance ss/straightness tole

taken as the datum. If the feadatum, see paragraph 2.4.4.4, page 8.

rpendicularity The generaforming theeither may be taken as the datum.


STANDARD en 1350 K 2008-08-22 10 6 (19)

Date Edition Page

rances for ranges of nominal lengths of the shorter side

Table 5. General tolerances on perpendicularity.

Perpendicularity toleTolerance class

–100 >100–300 >300–1000 >1000–3000

H 0,2 0,3 0,4 0,5

K 0,4 0,6 0,8 1

L 0,6 1 1,5 2

2.4.3.3 Symmetry The general tolerances on symmetry are given in table 6. The longer of the two features shall be taken as the datum. If the features are of equal nominal length, either may be taken as the datum. Note: The general tolerances on symmetry apply where at least one of the two features has a median plane,

or the axes of the two features are perpendicular to each other.

See examples in paragraph 2.4.4.5, page 9.

Table 6. General tolerance on symmetry

Symmetry tolerances for ranges of nominal lengths of the shorter side Tolerance class

–100 >100–300 >300–1000 >1000–3000

H 0,5 5)

K 0,6 5) 0,8 1

L 0,6 1 1,5 2

Note: Note: When changing an old tolerance class, see paragraph 5 page 17, symmetry tolerances according to AC-STD 4551 K (ISO 1101:2004) may be required for some dimensions.

5) For all drawings with drawing owner “TOO“ the general tolerance for symmetry is 0,2 mm, unless otherwise indicated.

2.4.3.4 Coaxiality General tolerances are not specified. Note: The deviation in coaxiality may, in extreme cases, be as great as the tolerance value for circular radial run-out

given in table 7, since the deviation in radial run-out comprises the deviation in coaxiality and the deviation in roundness.

2.4.3.5 Circular run-out The general tolerances on circular run-out are given in table 7.

For general tolerances on circular run-out, the bearing surfaces shall be taken as the datum. Otherwise, for circular radial run-out, the longer of the two features shall be taken as the datum. If the features are of equal nominal length, either may be taken as the datum.

Table 7. General tolerances on circular run-out.

Tolerance class Tolerances on circular run-out

H 0,1

K 0,2

L 0,5



2008-08-22 10 7 (19) Page

2.4.4 Ex

2.4.4.1 GeneAccording to the principl depen STD al tolerances apply independently of the actual local size of the work- e features. rdingly, the general geometrical tolerances m used even if the feature r maximum material size everywh , see figure 2 w.

amples

ral e of in dency (AC- 4555 K) general geometric

piecs are at thei

Accoay be

ere belo

If the envelope requirement (AC-STD 4555 K) is indi cent to the feature or generally to all features of size as described in paragraph 4.5, page 17, this requirement

be complied with.

vidually indicated adja

should also

Figure 2. Priciples of independency; maximum permissible deviations on the same feature.

-mH

Maximum straightness deviation

Maximum limit of size

Maximumsult

General tolerances AC-STD 1350 K

roundness deviation re ing from a loNote: The value 0

table7, page ee also ragraph 2.4.2.2, page 5.

bed form,1 mm comes from 6. S

pa

Maximum limit of size



2008-08-22 10 8 (19) Page

re 3 and 4. (See also paragraph 2.4.2.2, page 5.) 2.4.4.2 Roundness

See figu

In figure 3, the permissible deviation of the diameter is indicated directly on the drawing. The general tolerance on roundness is equal to the numerical value of the diameter tolerance, since the value in table 7, page 6 is larger.

Indication on the drawing Roundness tolerance zone

AC-STD 1350 K -K

Figure 3. Example of gener

In figure 4, the permissible deviat ccording to the general tolerance for AC-STD 1350 K –mK. The permissible deviations for the diameter of 25 mm are ± 0,2 mm. These deviations lead to the numerical value of 0,4 mm, which is greater than the value of 0,2

e 6. The value of ndness

al tolerance on roundness.

ion of the diameter is a

mm given in table 7, pagtolerance.

Indication on the drawing

0,2 mm, therefore, applies for the rou

Roundness tolerance zone

AC-STD 1350 K -mK

Figure 4. Example of general tolerance on roundness.

2.4.4.3 Cyli city The combined effect of the general tolerances of roundness, straightness and parallelism is, for geometrical reasons, smaller than the sum of the three tolerances since there is also a certain limitation by the size tolerance. However, in order to decide whether the envelope requirement

ndri

or an individual cylindricity tolerance is to be indicated, the sum of the three tolerances can be taken into account.

2.4.4.4 Parallelism Depending on the shapes of the deviations of the features, the parallelism deviation is limited by the numerical value of the size tolerance, see figure 5, or by the numerical value of the straightness or flatness tolerances, see figure 6.



Page 2008-08-22 10 9 (19)

2.4.4.5 Symmetry See example figure 7.

a) Datum: longer feature (l2)

re (l1) b) Datum: longer featu

c) Datum: longer feature (l2)

d) Datum: longer feature (l1)

Figure 7. Examples of general tolerances on symmetry. Note: According to ISO 1101:2004 (Annex A) references now should always be stated with a reference letter.

Direct reference as shown in this figure (ISO 2768-2:198

9) is no longer permitted.

nal tolerance Straightness tolerance

Figure 5. Parallelism deviation equal to the numerical value of the size tolerance

Figure 6. Parallelism deviation equal to the numerical value of the straightness tolerance

Dimensio



2008-08-22 10 10 (19) Page

2.4.4.6 Dra ing example w

Figure 8. Drawing example (reference to 1350 K -mH).

2.4.4.7 Interpretation of drawing example

ote: The tolerances shown in chain thin dashed lines (boxes and circles) are general tolerances. These tolerance

values would be automatically achieved by machining in a workshop with a customary accuracy equal to or be inspected.

As some tolerances also limit the deviations of other characteristics of the same feature, e. g. the perpendicularity tolerance also limits the straightness deviations, not all general tolerances are shown in the interpretations above.

Figure 9. Interpretation of drawing example.

1)

1) According to ISO 1101:2004 (Annex A) references now should always be stated with a reference letter. Direct reference as shown in this figure (ISO 2768-2:1989) is no longer permitted

N

finer than AC-STD 1350 K -mH and would not normally require to


STANDARD en 1350 K 2008-08-22 10 11 (19)

Date Edition Page

2.4.5 MisGene 50

) in accordance with paragraph 4, page 16.

eral tolerances correspond to tolerance classes of customary workshop ropriate tolerance class should be selected and indicated on the drawing.

Above a certain tolerance value, which corresponds to the customary workshop accuracy, there is usually no gain in manufacturing economy by enlarging the tolerance. In any event, workshop machinery and the usual workmanship normally do not manufacture features with greater deviations. For example, a feature having a 35 mm diameter could be manufactured to a high level of conformance in a workshop with ”customary medium accuracy”. Specifying a tolerance of ± 1 mm would be of no benefit in this particular workshop, as the general tolerance values of ± 0,3 mm would be quite adequate. A feature of 25 mm ± 0,1 mm diameter by 80 mm long manufactured in a workshop with a customary accuracy equal to or finer than AC STD 1350 K –mH contains the geometrical deviations well within 0,1 mm for roundness, 0,1 mm for straightness of surface elements, and 0,1 mm for circular radial run-out (the values given have been taken from this part of AC STD 1350 K). Specifying tolerances would be of no benefit in this particular workshop.

However, if, for functional reasons, a feature requires a smaller tolerance value than the general tolerances, then that feature should have the smaller tolerance indicated individually adjacent to the particular feature. This type of tolerance falls outside the scope of general tolerances.

In cases where the function of a feature allows a geometrical tolerance equal to or larger then the general tolerance values. This should not be individually indicated, but should be stated on the drawing as described in paragraph 4, page 16. This type of tolerance allows full use of the concept of general geometrical tolerancing.

There will be “exceptions to the rule” whereby the function allows a larger tolerance than the general tolerances, and the larger tolerance will provide a gain in manufacturing economy. In these special cases, the larger geometrical tolerance should be indicated individually adjacent to the particular feature, e.g. the roundness tolerance of a large and thin ring.

3 GENERAL STANDARD REFERENCES In paragraph 3.2.1 - 3.2.12 below, standards have been listed, which normally can be applied on Atlas Copco drawings and manufacturing documents without any specific references to the

Please note that, the conditions required, for such general standard references, is that a TD 1350 K) has been made on the drawing.

3.1 General In order to be able to interpret dimensioning, symbols, etc. on a drawing, it is necessary that references are made to the applied standards. Those references may be very extensive, making it more difficult to read the drawing. Therefore, a list of general standard references has been added to this standard.

When other standards than those listed below are applied, a reference to th standards must always be made, if the standard documents are needed for interpretation of the stated requirements. Note: If all required dimensions, etc. in a standard have been stated on the drawing, a reference to the applied standard

is normally not necessary.

3.1.1 Availability of standards All Atlas Copco standards listed below are internally available in database ”Standard Documents - GSD”, and externally for subsuppliers on internet:

www.atlascopco.com/gsd

cellaneous ral tolerances should be indicated on the drawing by referring to this part of (AC STD 13

K

The values of genaccuracy. The app

concerned standard documents.

reference to this standard (AC-S

ose

Note: When searching Atlas Copco standards on internet, only the

between the number and capital ”K”) should be stated, witho

External standards (ISO, DIN, etc.) are available or ca in the Atlas Copco Group via database ”External Standards 2.0 - GSD”. Because of licence agreements, external standards must not be placed at disposal by Atlas Copco to subsuppliers.

standard number, e.g. 1350 K (a single space ut any additions.

n be ordered for use with


STANDARD en 1350 K 2008-08-22 10 12 (19)

Date Edition Page

3.1.2 ISOEarli

apply external standards directly. When required rsed through simplified Atlas Copco standards,

ents about application, additions, exclusions, etc.

3.2 List ockets in the tables below, are for information

-

3.2.1 Lin

compared to AC-STD er, Atlas Copco internal standards (AC-STD) were always created, when required. They still

exist to a large extent, and are mainly based on international standards (ISO). There also exist Atlas Copco standards without any connection to external standards.

Today, the ambition is, to a higher degree, toexternal standards, preferably ISO, can be endocontaining comm

f standards Standards, and other information, shown within braonly, and should normally only be used with a reference to concerned standard, e.g. ISO 12823 must be referred to when used.

es, arrows and dimensioning

ISO AC-STD Comments

128-1 Index

128-20 Basic conventions for lines

128-21 Lines in CAD systems

128-22 1211 K No informative divergences. Leader lines and reference lines

(128-23) (constructions)

128-24 1211 K, 1312 K No informative divergences. Mechanical designs

(128-25) (shipbuilding)

129-1 1420 K No informative divergences, besides threads, which also are included in 1420 K. Dimensioning

3.2.2 Text

ISO AC-STD Comments

3098-0 1212 K No informative divergences. Lettering - General requirements

3098-2 1212 K No informative divergences. Latin alphabet

3098-3 Greek alphabet

3098-4 Diacritical and particular marks for the latin alphabet

3098-5 CAD lettering of the latin alphabet

3098-6 Cyrillic alphabet

1213 K Writing rules

3.2.3 Project methods

ISO AC-STD Comments

5456-1 Synopsis

5456-2 Orthographic representations

5456-3 Axonometric representations

5456-4 Central projection

10209-2 Terms

3.2.4 Views and sections

ISO AC-STD Comments

128- ative divergences. Basic conventions for views 30 1310 K No inform

128-34 1310 K No informative divergences. Views for mechanical designs

128-40 1311 K No informative divergences. Basic conventions for cuts and sections

128-44 1311 K No informative divergences. Sections for mechanical designs


STANDARD en 1350 K 2008-08-22 10 13 (19)

Date Edition Page

ative divergences. Basic conventions for for representing areas on 128-50 1311 K No informcuts and sections

3.2.5 Item references

ISO AC-STD Comments

6433 1910 K Certain divergences, but no contradiction. Parts list

3.2.6 Qu

antities and units

ISO AC- Comments STD 31-0 - 31-13, 1000 2131 K Certain divergences, but no contradiction. (ISO 31-3 = Mechanical designs)

3.2.7 Symbols

ISO AC-STD Comments

701 Gears - Symbols for geometrical data

1043-1 2051 K No informative divergences. Plastics - Symbols

1219-1 1280 K No informative divergences. Symbols for fluid diagrams 3952-1 - 3952-4 Kinematic diagrams

5784-1 - Symbols for flu5784-3 id diagrams, logic functions

81714-1 Design of graphical symbols

3.2.8 Com s and aracteri-

ponent ch stics

ISO ACSTD Comments

68-2 3514 K ces. UNC threads No informative divergen228-1 3524 K No informative divergences. Pipe threads (G)

3514 K gences. UNC threads No informative diver263

3517 K No informative divergences. UNF threads 272, 4762 No informative divergences. Widths across flats 4341 K

273 4361 K 4361 A

No informative divergences. Clearance holes for bolts and screws Note: 4361 A is mainly intended for business line CT (Airpower)

2162-1,-2,-3 1330 K No informative divergences. Springs 2203 1330 K No informative divergences. Gears 2306 e divergences. Drill diameters for threads 6272 K No informativ2553 6890 K No informative divergences. Welding symbols 2901 3544 K No informative divergences. Trapetzoidal threads 2901, 2902,

04 5 K ergences. Trapetzoidal threads 2903, 29 354 No informative div

5261 Bars and profile sections 5455 1210 K (for CAD other scales are permitted) No informative divergences. Scales5845-1 Assembly of parts with fasteners 6410-1 divergences. Threads 1330 K No informative6410-2 1330 K No informative divergences. Thread inserts 6410-3 1330 K No informative divergences. Threads, simplified representation 6413 e divergences. Splines 1330 K No informativ8826-1, -2 1330 K divergences. Rolling bearings No informative 9222-1, -2 1330 K divergences. Seals No informative

(13715) 1436 K d corners. (1436 K includes additions to ISO.) Major informative divergences. Edges an


STANDARD en 1350 K 2008-08-22 10 14 (19)

Date Edition Page

der and a cone ..., etc. 14660-2 Extracted median line of a cylin

Note: dards w

63) AC-STD 6885 K, erical codes for welding, etc.

-STD 6892 K, quality levels for welding, etc.

11) ACormally c t not required, when no reference to standard has been made.)

520- 6

3.2.9 Dimen and tolera ng

Examples of stan

(ISO 40

hich requ

num

ire a reference:

(ISO 5817) AC

(ISO 64(N

-STD 4251 K, cententre holes a

re holes. re permitted, bu

(ISO 6 1) AC-STD 892 K, quality levels for welding, etc.

sioning nci

ISO AC-STD Comments

1 Standard reference temperature for geometrical product specification and verification

129-1 1420 K No informative divergences. Dimensioning 286-1, -2 4501 K No informative divergences. ISO system of limits and fits 406 1305 K No informative divergences. Tolerancing of linear and angular dimensions 1660 Dimensioning and tolerancing of profiles 3040 4031 K Dimensioning and tolerancing of cones (3302-1, -2) 1359 K Major informative divergences. Rubber 3508 e divergences. Thread run outs 4316 K No informativ(4753) 4331 K Flat screw ends with chamfer. (ISO 4753 not specifically for chamfers) 6410-1 1330 K No informative divergences. Threads 7083 Geometrical tolerances, proportions of symbols

8015 4555 K No informative divergences. Relation between dimensional tolerances and lerances geometrical to

10135 Castings TR 16015 Vocabulary of metrology TR 14638,

-1, -2

TS 17450TS 17450

Geometrical Product Specification (GPS)

Note: dards which require a reference:

768- -2) 1350 K pply.

62) AC-STD 613 achining allowances on castings.

ISO 10579, non-rigid parts. It is considered neccessary to reference this standard, by the note (ISO 10579-NR),

3.2.10 Geo al tolera

Examples of stan

(ISO 2 1, , i.e. this standard, which has to be referenced to a

(ISO 80 1 K, dimensional tolerances and m

whenever it is applied.

metric ncing

ISO AC-STD Comments

1101 4551 K Minor divergences, see ISO 1101 Annex A. Tolerances of form and position

2692 rial principle (ISO also include 4553 K No informative divergences. Maximum mate”Least material requirement”)

5458 4551 K No informative divergences. Positional tolerancing

5459 4552 K No informative divergences. Datums and datum systems

7083 Geometrical tolerancing, symbol proportions

14660-1, -2 Geometrical features

10578 d tolerance zone 4551 K No informative divergences. Projecte

3.2.11 Surface texture

STD ISO AC- Comments

(1302, 4287) 1254 K Major divergences. 1254 K follows older ISO edition. Surface texture


STANDARD en 1350 K 2008-08-22 10 15 (19)

Date Edition Page

3098-3 Greek alphabet 3274, 4287, 4288 Profile method

8785 Surface imperfections

10135 Castings

11562 Profile method - Phase correct filters

12085 Motif Parameters 13565-1, -2, -3 Profile method - Filtering, Height characterization, etc.

14253-1, TS 14253-2,TS 14253-3

Inspection. Measuring equipment

14660-1 General terms and definitions. Geometrical Product Specifications (GPS)

3.2.12 Document handling

ISO AC-STD Comments

545 of drawing sheets 7 1120 K No informative divergences. Sizes

1511 K Abbreviations for used CAD system

(6428) 2602 K Major divergences. Requirements for microcopying

(72 2342 K diction. Title blocks and document headers 00) 1220K, Major divergences, but no contra

(7573) 1910 K Major divergences, but no contradiction. Parts list (Item lists)

(11442) 1 nces. Secrecy of drawings 102 K Major diverge

11442 Document management

(16016) 1102 K ces. Secrecy of drawings Major divergen

1010 K Drawing principles

1 dels 016 K Transfer of drawing ownership - Original drawings/CAD mo

1100 K Filing drawings

1220:01 K Drawings subject for authority approval

3 e, modification and withdrawal order 391 K Guidelines for design, notification, releas

3.3 Examples of drawing i

3.3.1 Gen dard rBelow, is tabula d a sel . Those indications may be used without as been made to AC-STD 1

indicat ons

eral stan eferences te ection of commonly used drawing indications any reference to concerned standards, under the condition that a reference h

350 K.



Page 2008-08-22 10 16 (19)

3.3.2 Non general standard references ree examples of drawing indications, which always Below, for information only, are shown th

require standard references.

Example i Comments s of draw ng indications ISO AC-STD

8062 6131 K Castings. System of dimensional tolerances and machining allowances

10579 Tolerances of Form and position for ”Non-Rigid parts”

Surface character for sharp K peaks 1254:03



2008-08-22 10 17 (19) Page

erence to this standard (AC-STD 1350 K) should be made in the thin the Atlas Copco Group. Hereby, general references to all

ral tolerances to be applicable ISO tolerance classes has to be indicated. Note: ISO tolerance classes are shown under paragraph 2.3, page 3 for linear and angular dimensions, and

according to paragraph 2.4, page 4 for geometrical tolerances.

4.1 Generrd references according to

paragraph 3, page 11 are required, this shall be indicated according to the example below.

4 INDICATION ON DRAWINGSIndication on drawings, with reftitle block on most drawings wistandards stated in paragraph 3, page 11 always apply.

The standard designation (1350 K) may be stated with or without ISO tolerance classes (se below), but in order for the gene

al standard references only If general tolerances are not applicable, but general standa

4.2 for only linear and angular dimensions in

ndard and ISO tolerance class shall be indicated according to example below.

Linear and angular dimensions If general standard references and general tolerancesaccordance with AC STD 1350 K shall apply, reference to this sta

4.3 If general standard references and general linear and angular tolerances together with general geometrical tolerances shall apply, reference to this standard followed by ISO tolerance classes shall be indicated according to example below.

Note: For ISO tolerance classes (f, m, c, v), see table 1-3, page 3-4

Dimensional tolerances and geometrical tolerances

Note: In this case the general tolerances for right angles (90°), paragraph 2.3, do not apply, because paragraph 2.4

specifies general tolerances on perpendicularity.

For ISO tolerance classes (f, m, c, v and H, K, L ), see table 1 - 7, page 3 - 6.

4.4 Geometrical tolerances only If the linear and angular dimensional tolerances shall not apply, their designation shall be omitted.

Note: For ISO tolerance classes (H, K, L), see table 4 - 7, page 5 - 6.

4.5 Both dimensional, geometrical and envelope requirements In cases where the envelope requirement also applies to all single features of size, the designation –E shall be added after the ISO tolerance class (AC-STD 4555 K). Note: For the purpose of this part of AC-STD 1350 K a single feature of size comprises a cy wo

parallel plane surfaces.

The envelope requirement

lindrical surface or t

cannot apply to featur indicated strai hich are greater than their size tolerances, e.g. raw materials.

es with individually ghtness tolerances, w



2008-08-22 10 18 (19) Page

5 OLDER DRAWING INDICATIONS Older general tolerances and their meaning are explained below.

5.1 Linear measures Permissible deviations

Tolerance class Nominal sizes 1 2 3 4

- 3 ± 0,05 ± 0,1 - - (3) - 6 ± 0,05 ± 0,1 ± 0,2 ± 0,5 (6) - 30 ± 0,1 ± 0,2 ± 0,5 ± 1

(30) - 120 ± 0,15 ± 0,3 ± 0,8 ± 1,5 (120) - 315 ± 0,2 ± 0,5 ± 1,2 ± 2 (315) - 1000 ± 0,3 ± 0,8 ± 2 ± 3

(1000) - 2000 ± 0,5 ± 1,2 ± 3 ± 4 (2000) - 4000 ± 0,8 ± 2 ± 4 ± 6 ( ± 8 4000) - 8000 - ± 3 ± 5 (8000) - 12000 - ± 4 ± 6 ± 10

(12000) - 16000 - ± 5 ± 7 ± 12 (16000) - 20000 - ± 6 ± 8 ± 12

5.2 Rounding-off radii and chamfers Permissible deviations

Tolerance class Nominal sizes 1 and 2 3 and 4

- 3 ± 0,2 ± 0,4 (3) - 6 ± 0,5 ± 1 (6) - 30 ± 1 ± 2

(30) - 120 ± 2 ± 4 (120) - 315 ± 4 ± 8

5.3 Angular dimensions Permissible deviations

Tolerance class Nominal sizes (shortest side of

the angle) 1, 2 and 3 4 L Δα A Δα A *) *)

- 10 ± 1⁰ ± 1,75 ± 3⁰ ± 5,25

(10) - 50 ± 30' ± 0,9 ± 2⁰ ± 3,5

(50) - 120 ± 20' ± 0,6 ± 1⁰ ± 1,75

(120) - ± 10' ± 0,3 ± 30' ± 0,9

*) The values are valid for measuring lengths of 100 mm according to figure 10. For other me A shall be increased or decreased in

asuring lengths,

proportion to the measuring length.

Figure 10.

2008-08-22 10 19 (19)


STANDARD en 1350 KDate Edition Page

5.4.1 On

5.4 Old methods of indication

e tolerance class

Different tolerance classes 5.4.2