Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. इंटरनेट मानक “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “प0रा1 को छोड न’ 5 तरफ” Jawaharlal Nehru “Step Out From the Old to the New” “जान1 का अ+धकार, जी1 का अ+धकार” Mazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 7859 (1975): Gauge Allowances and Manufacturing Tolerances for Plain Gauges for Inside Measurements for ISO Fit Sizes (nominal size up to 500 mm) [PGD 25: Engineering Metrology]
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Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 7859 (1975): Gauge Allowances and ManufacturingTolerances for Plain Gauges for Inside Measurements for ISOFit Sizes (nominal size up to 500 mm) [PGD 25: EngineeringMetrology]
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UDC 621.753.3 ( First’keprint MAR&l 1982 1
Indian Standard
IS : 7859 - 1976
m 1 I
GAUGE ALLOWANCES AND MANUFACTURING TOLERANCES FOR PLAIN GAUGES FOR INSIDE
MEASUREMENTS FOR IS0 FIT SIZES (NOMINAL SIZE UP TO 500 mm)
1. Scope - Lays down the gauge allowances and manufacturing tojerances for plain cylindrical ant flat plug gauges and spherical ended plain plug gauges for internal dimensions (holes) for IS0 fit sizes uf to 500 mm nominal size.
2. Symbols - Following symbols are used in this standard (see a/so Fig, 1):
Agn 2 Gauge allowance for GO member, new;
Ang = Gauge allowance for NO GO member;
Agw = Wear allowance for GO member, worn out;
Y = Margin, outside the GO workpiece limit, of the wear limit of gauges for holes;
z = Distance between centre of tolerance zone of new GO gauges for holes and GO workpiecr limit;
Note - For. values of y and z see Table 2 of IS : 3455-1971 ‘Gauging practice for plain workpieces (firs revision) .
rc = Safety zone provided for compensating measuring uncertainties of gauges for holes o nominal diameter above 180 mm ;
H = Tolerance on cylindrical plug or cylindrical bar gauges;
Hs = Tolerance on spherical ended plug gauges;
N = Nominal size of the workpiece;
T = Tolerance of the workpiece ;
G = Upper deviation of the workpiece;
K = Lower deviation of the workpiece.
3. Formulae for Determining Gauge Dimensions
Gauge Member Formulae Examples of Calculation
Cylindrical and Flat Plug Gauge Spherica\a;zed Plug
25 E9 100 H9 200 R7
GO member, new (NSAgn) i;* (25$0~049)10002 (loo+0 015)&O 003 (200-0~099)~0~003 5
=25~049+0~002 =100~015&0~003 =199~901~0~003 5
NO GO member W+ AW) q (25+0~092)&0~002 (100$0~067)~0~003 (200-0.063)&0~003 5
=25~092*0~002 =100~087&0~003 =199.937&0.003 5
GO member, worn out N+Agw 25+0.040 loot0 200-0~109
=25.040 ==1@0~000 = 199.891
*H.
? IS applicable for cylindrical and flat plug gauges. f-4
T plug gauges.
should be substituted for t In the formula for spherical ended
1. Disposition of Tolerance for Cylindrical and Flat Plug Gauges and Spherical Ended Plug ;auges - Figure 1 shows the disposition of tolerance for cylindrical and flat plug gauges and spherical snded plug gauges with relation to the workpiece tolerance.
1. Calculated Values - Calculated values (in pm) of the gauge allowances for cylindrical and flat plug lauges and spherical ended plug gauges for a few selected IS0 tolerance zones are given in Table 1 under A.
Adopted 10 October 1975 I-
8 May 1976. ISi I
Price Rs 13.z
INDlAh STANDARDS LNSTITUTION MANAK BHAVAN, 9 BAHADUR SHAH Z4FAR MARG
NEW DELHI llBOO2
.I - ._. .~ _ _. ___~.
1,
____
IS : 7859 - 1975
i i
0s Agw* o$
K /
t I I t t ZERO LINE
FOR SIZES UP TO 16Omm
* Ii* ;OR_iS-
-I -a
Ang*
,
FOR SIZES ABOVE 180mm 7
* For values in pm, see Table 1.
FIG. 1 DISPOSITION OF TOLERANCES
2
IS : 7859-1975
TABLE 1 GAUGE ALLOWANCES AND MANUFACTURING TOLERANCES FOR INSIDE MEASUREMENTS
( Clause 5 )
All values in pm.
I UPTO OVER, AND INCLUDING
3 6
6 10
10 18
18 30
30 40
40 50
50 65
65 80
80 100
100 120
120 140
140 160
160 180
180 200
200 225
225 / 250
TOLERANCE CLASS
iAUGE All Bll Cl1
An9 + 530 6.5 AWJ + 365 6.5 AW +340 -
An9 + 550 6.5 A9n -I- + 385 6.5 A9w + 360 - Aw t 600 7.5 AW -t 408 7.5 Aw + 380 -
IS : 3455-l 971 ‘Gauging practice for plain workpieces (first revision)’ specifies the dimensions for different types of plug, ring and gap gauges. This standard gives in a tabulated form, the calculated values of the gauging allowances and manufacturing tolerances for cylindrical and flat plug gauges and spherical ended plug gauges of nominal sizes up to 500 mm for selected IS0 tolerance zones as recommended in ISO/R 1829-1970 ‘Selection of tolerance zones for general purposes’. This standard supplements the details given in IS : 3455-l 971. For individual gauges reference should be made to the foilowing - standards :
a) IS : 6137-1971
b) IS : 6138-1971 30 mm)
c) IS : 6244-1971
d) IS : 62451971 100 mm)
e) IS : 6246-1971 250 mm)
f) IS : 6247-1971 250 mm)
g) IS : 7018-1973
Gauging members for plain plug gauges ‘GO member’ (size range 1 to 30 mm)
Gauging members for plain plug gauges ‘NO GO member’ (size range 1 to
Gauging members for plain plug gauges ‘GO’ member (size range 30 to 100 mm)
Gauging members for plain plug gauges ‘NO GO’ member (size range 30 to
Gauging members for plain plug gauges ‘GO’ member (size range 100 to
Gauging members for plain plug gauges ‘NO GO’ member (size range 100 to
Technical supply conditions for gauges
In the preparation of this standard assistance has been derived from DIN 7164-1966 ‘Arbeitslehrdorne und Kugelendmasse fur IS0 Passmasse von 1 bis 500 mm Nennmass Lehrenmasse und Herstelltoleranzen (Workshop plug gauges and spherical plug gauges for ISO-fit sizes from 1 up to 500 mm nominal size; deviations and tolerances for gauges)’ issued by DIN Deutsches lnstitut fur Normung.
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