297 Roller bearing units F SYE 2 7 / 16 NH - 118 1 2 3 4 5 F Four bolt base (on SYE only) 1. Prefix: 3. Shaft size: N ConCentra design H Held unit Y Closed end (end cover supplied) PA Housing with take-up frame (for TRH) 4. Suffix: F Unit with locating bearing L Unit with non-locating bearing TS Unit with labyrinth seals 4. Suffix: (SYT only) -3 Garter spring seal (for collar mounted) -18 Labyrinth seal (for collar mounted) -118 Labyrinth seal (for ConCentra) -xx Travel code, inches (length of travel for take-up frames) 5. Suffix/options/specials: SYE Pillow block SYR Pillow block SYT Pillow block FYE Square flange unit FYR Round flange unit FYRP Piloted flange unit TBR Center pull take-up unit TRH Take-up unit TFT Take-up frame only (for SYR / SYE) PA Take-up frame only (for TRH) 2. Housing style: Nomenclature
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297
Roller bearing units
F S Y E 27⁄16 NH - 118
12
34
5
F Four bolt base(on SYE only)
1. Prefix: 3. Shaft size:
N ConCentra design
H Held unit
Y Closed end (end cover supplied)
PA Housing with take-up frame(for TRH)
4. Suffix:
F Unit with locating bearing
L Unit with non-locating bearing
TS Unit with labyrinth seals
4. Suffix: (SYT only)
-3 Garter spring seal (for collar mounted)
-18 Labyrinth seal (for collar mounted)
-118 Labyrinth seal (for ConCentra)
-xx Travel code, inches(length of travel fortake-up frames)
5. Suffix/options/specials:
SYE Pillow block
SYR Pillow block
SYT Pillow block
FYE Square flange unit
FYR Round flange unit
FYRP Piloted flange unit
TBR Center pull take-up unit
TRH Take-up unit
TFT Take-up frame only (for SYR / SYE)
PA Take-up frame only (for TRH)
2. Housing style:
Nom
enclature
298
Roller bearing units
SKF roller bearing pillow blocks, flange blocksand take-up units are offered with collarmounting. SKF roller bearing pillow blocks andtake-up units are offered with ConCentramounting. Both are based on the SKF 22200series spherical roller bearing. Fully assembledand pre-greased, the units need no internalbearing adjustments at assembly. This savestime and eliminates the risk of bearingcontamination during assembly.
TriGard™ seals asstandard. Garter springcontact seals, labyrinthseals, and end covers also available.
Shaft ready assembly; pre-assembled and pre-greased.
High capacity SKFspherical roller bearingwith running or staticmisalignment of ±11/2°.
Shaft attachmentcollar mounting forease of installation and holding power.
Rugged one-piece cast-ironhousing. Available in a variety of mounting styles.
Controlled bearing fitin the housing. Available as a held orfree assembly.
Roller bearing units offer many of theadvantages of the split housing series but withthe convenience of just slipping it on the shaft.Running or static misalignment, free or heldassemblies, two- or four-bolt bases, cast ironand a variety of seal options make the rollerbearing unit a preferred alternative to the split housing.
Extreme ease of mounting anddismounting, only tool necessary is a hex head wrench.
Proven effective TriGard seals,labyrinth seals and end coversare also available.
Patented multi-taper sleeveuniformly clamps its inner ringaround the entire shaftcircumference and eliminatesmounting problems. The result:The unit is centered with theshaft and the inner ring secure,preventing slipping or “walking”on the shaft caused by a loosefit between the bearing innerring and shaft.
Rugged one-piece cast-iron housing.
Controlled bearing fit inthe housing. Available asa held or free assembly.
SKF has taken every effort to assurethat quality and trouble-free operation is designed into each roller bearing unit. SKFroller bearing units incorporate the worldleading SKF 22200 series spherical rollerbearing. Housing strength, housing boretolerance, machined base flatness and seals areclosely evaluated and tested, and are monitoredto assure optimum performance in a wide rangeof applications. Some typical applications are:
Offered in a range of shaft sizes from17
16" to 41516", SKF roller bearing units are
a convenient, economical choice to yourmounted bearing solution.
MountingCollar-mounted roller bearing units slide easilyonto the shaft and are locked in place with atwo set screw locking collar. The locking collarkeeps pressure on the set screws helping tomaintain the tight fit with the shaft. For addedholding power, the largest sizes are designedwith two locking collars, indicated in thedimension tables. Mounting is quick and easy.
HousingsThere are a variety of housing styles in the SKFroller bearing unit product line, including pillowblocks, flange units and take–ups. Pillow blocksare made in two configurations: the SYE isdimensionally interchangeable with competitor"E" designs and the SYR is dimensionallyinterchangeable with units such as the DodgeS–2000, Linkbelt P–B22400, and Rexnord ZA2000 series.
Seals
TriGard seal (standard)
End covers (suffix Y)
Garter spring seal (suffix – 3)
Labyrinth seal
Introduction
Roller bearing units are supplied completelyassembled with bearings, seals, and grease.They are ready for installation right out of thebox and require no internal adjustment.
BearingsThe bearings used in SKF roller bearing unitsare based on the high capacity SKF 22200series spherical roller bearing. They can handleheavy radial and axial loads, running and staticmisalignment, and high operating temperatures.Clearances in the bearing are preset; noadjustment is required during mounting.
Bearing based on SKF 22200 series sphericalroller bearing. Heavy loads and runningmisalignment.
Note: When the load is heavy, C/P < 8.3, a press fitmust be used. Consult SKF Applications Engineering.
GreaseAll roller bearing units are factory lubricatedwith SKF LGEP2 grease or equivalent.
17⁄16 to 23⁄16 (2) 3⁄8" - 24 250 51527⁄16 to 31⁄2 (2) 1⁄2" - 20 620 900311⁄16 to 4 (2) 5⁄8" - 18 1325 120047⁄16 to 415⁄16 (4) 5⁄8" - 18 1325 2400
Table 2
Recommended shaft tolerances
Shaft diameter Tolerance
Up to 115⁄16" Nominal to -0.0005"2" to 415⁄16" Nominal to -0.0010"
301
MountingThe ConCentra roller bearing unit uses apatented multi–tapered sleeve arrangement,making it easy to mount the bearing to theshaft. This method provides nearly 360° ofinterference fit, which does not offset the centerline of the shaft and helps reduce fretting.
HousingsThere are a variety of housing styles in theConCentra roller bearing unit product lineincluding pillow blocks and take-ups. Pillowblocks are made in three configurations: the SYEis dimensionally interchangeable with competitor"E" designs, the SYR is dimensionallyinterchangeable with units such as the DodgeS–2000, Linkbelt P–B22400, and SKF collar-mounted unit roller bearings; and the SYT isdimensionally interchangeable with plummerblock assemblies of series SNL 5.
Seals
TriGard seal (standard)
Labyrinth seal (suffix – 118)
*End covers (suffix Y)
*Consult SKF for Availability
Introduction
ConCentra roller bearing units are suppliedcompletely assembled with bearings, seals, andgrease. They are ready for installation right outof the box and require no internal adjustment.
ConCentra units can be used in the sameapplications as collar-mounted roller bearingunits. The difference between the two types isthat the ConCentra unit mounts with a near360° interference fit (see "Mounting", to theright, and Product descriptions on followingpage).
BearingsThe bearings used in ConCentra roller bearingunits are based on the high capacity SKF 22200series spherical roller bearing. They can handleheavy radial and axial loads, running and staticmisalignment, and high operating temperatures.Clearances in the bearing are preset; noadjustment is required during mounting.
GreaseAll roller bearing units are factory lubricatedwith SKF LGEP2 grease or equivalent.
TolerancesIn normal cases shafts machined to tolerance h9can be used. The cylindricity as defined in ISO1101:1996 should be according to IT5/2. Forless demanding applications h10 and IT7/2 maybe satisfactory.
Table 3
Recommended shaft tolerances
Shaft diameter Tolerance
Up to 11⁄2" +0.000" to -0.003"(Up to 38.10 mm) (+0 to -76 µm)
111⁄16" to 21⁄2" +0.000" to -0.004"(42.86 to 63.50 mm) (+0 to -101 µm)
211⁄16" to 4" +0.000" to -0.005"(68.26 to 101.60 mm) (+0 to -127 µm)
Grease characteristics
Base oil Mineral
Thickener Lithium
Application temperature -4° to 230° F (-20° to 110° C)
NLGI 2
Viscosity at 100° F (40° C) 900 SUS (190 cSt)
212° F (100° C) 82 SUS (16 cSt)
Roller bearing units
302
SKF roller bearing units are available in avariety of housing styles and two mountingmethods. These units are simple and economicbearing arrangements combining the high loadcapacity and self-aligning features of the SKFspherical roller bearing with the convenience ofset screw mounting and a rugged cast-ironhousing. They come pre-greased and fullyassembled. Installation time is reduced andthere is no risk of bearing contamination duringassembly. Roller bearing units can accommodaterunning or static misalignment of ±11⁄2° and can be supplied as free or held assemblies. Allunits incorporate triple protection TriGard sealsas standard, but can also be supplied withoptional seals.
Collar-mounted units use a locking collardesign to firmly secure the bearing inner ring tothe shaft. The two set screws extended throughthe inner ring of the bearing and lock into theshaft. The elasticity of the locking collarsmaintains pressure on the set screws helping tomaintain a secure fit to the shaft even in severepower transmission applications. Mounting isquick and easy. Slide the unit on the shaft, boltthe housing securely to the mounting surfaceand tighten the two set screws.
ConCentra units combine the advantages ofadapter mounting found in split pillow blockswith the convenience of set screw mountingfound in collar mounted roller bearing units. Theresult is a positive, near 360° interference fitwith the shaft. This is achieved with a uniquepatented multi-tapered sleeve arrangementdeveloped by SKF. The shaft is held concentric tothe bore of the bearing resulting in reducedfretting corrosion, good balance and lowvibration. Dismounting is just as easy. Loosen themounting set screws and tighten thedismounting set screws until the multi-taperedsleeve releases its grip, usually with a “POP”. Noneed for cutting torches or other mechanicaldevices. Downtime and shafting cost are saved.
ConCentra units are available inSYE-N, FSYE-N, SYR-N, and SYT (metric) pillowblocks as well as TBR-N and TRH-N take-uphousings. FYR and FYRP flange housing areavailable on an application review basis. This isdue to the often limited access to thedismounting set screws.
SYE/SYE-N
FSYE/FSYE-N
SYR/SYR-N
SYE/SYE-NCast-iron two-bolt base SYE and SYE-N unitroller pillow blocks are available in shaft sizesfrom 17⁄16" to 31⁄2". Pages 306 and 307.
FSYE/FSYE-NThe four-bolt base version of the SYE(-N) unit isthe FSYE(-N). They are available for shafts from27⁄16" to 415⁄16" (ConCentra is available up to a 4";please check SKF for availability). Pages 308 and 309.
SYR/SYR-NThese SYR and SYR-N are cast-iron two-boltbase unit roller pillow blocks. They are availablein shaft sizes ranging from 17⁄16" to 4". Pages 310 and 311.
Product descriptions
FYE
FYEFYE four-bolt flange cast-iron roller bearingunits are available in shaft sizes 17⁄16" to 4".These units typically occupy the bottom positionin vertical heat exchanger fan arrangements.The SKF spherical roller bearing provides lowvibration, quiet running performance. Page 313.
SYT
SYTThe SYT is a two-bolt base, cast-iron pillowblock that is dimensionally interchangeable with metric split plummer block housings. Onlyavailable with ConCentra insert bearings andmetric shaft diameters 35 mm - 75 mm. Page 312.
303
FYR FYRP
TFT
FYRFYR cast-iron flange unit roller bearings supportrotating shafts through walls, bulkheads, orother flat surfaces. The two smallest sizesmount to the surface with three bolts; all othersizes use four mounting bolts. They are availablefor shaft sizes from 17⁄16" to 4". These units relyon the mounting bolts for location and loadcarrying (FYR-N available on application review).Page 314.
FYRPThese piloted flange cast-iron flange units,available for shaft sizes from 17⁄16" to 4", have a machined extension on one side to fit into aprecisely machined bulkhead opening. Thisprovides additional location and support to theunit. All piloted flange units are supplied in four-bolt mounting arrangements (FYRP-Navailable on application review). Page 315.
TFTTFT top mount take-up frames are designed foruse with SYR, SYR-N, SYE and SYE-N unit rollerpillow blocks. TFT assemblies are used primarilyfor belt tensioning in conveyor applications. TheSYR blocks mount directly to the top of theframe and are positioned by turning theprotected adjustment screw at either end of theframe. TFT frames are available in travel lengthsranging from 12" to 48" and they accommodateSYR and SYR-N housings for shaft sizes from17⁄16" to 4". Pages 316 - 319.
Product descriptions
304
Roller bearing units
TriGard seal (standard)• Standard on all unit roller bearings• Features a double lip molded contact seal,
• Provides positive contact even undermisaligned conditions
• Permits ±11⁄2° misalignment• Low frictional torque• Limited to 200° F maximum operating
temperature
Labyrinth seal (suffix – 18)• Two-piece all metal labyrinth seal
provides for high operating speeds• Inboard flinger pressed on the inner ring
of the bearing helps retain grease andexclude contaminants
• Outboard stationary trash guard is pressedinto the housing and has close running toler-ance with the inner ring of the bearing toprevent the entrance of contaminants
• Design permits ±11⁄2° misalignment• No frictional torque• No temperature limitation
Garter spring seal (suffix – 3)• Features one-piece molded nitrile rubber seal
pressed into the housing bore• Provides greater grease retention and sealing
protection because stainless steel garterspring holds seal lip firmly to the groundinner ring
• Provides positive contact even undermisaligned conditions
• Permits ±11⁄2° misalignment• Provides good protection in moist
environment• Limited to 200° F maximum operating
temperature
End covers (suffix Y)• Steel end covers are simply pushed into
position in the housing bore• Provides additional sealing and protection
against exposed shaft ends
TriGard seal (standard)
Labyrinth seal (suffix – 18)
Garter spring seal (suffix – 3)
End covers (suffix Y)
Seal selection/collar-mounted roller bearing units
TriGard seal (standard)• Standard on all unit roller bearings• Features a double lip molded contact
seal, which rides on a ground surface of the mounting and dismounting collars
• Steel outboard trash guard protects the seal and excludes larger contaminants
• Provides positive contact even undermisaligned conditions
• Permits ±11⁄2° misalignment• Low frictional torque• Limited to 200° F maximum operating
temperature
Labyrinth seal (suffix – 118)• Three-piece all metal labyrinth seal
allows operation at the basic bearing grease speed rating
• Inboard flinger pressed on the inner ring of the bearing helps retain grease
• Outboard flinger pressed on the innerring flings contaminants away from the seal opening
• A stationary trash guard, positioned betweenthe two flingers, is pressed into the housingand helps create a difficult path labyrinth toprevent the ingress of contaminants
• Permits ±11⁄2° misalignment• No frictional torque• No temperature limitation
End covers (suffix Y)• Steel end covers are simply pushed into
position in the housing bore• Provides additional sealing and protection
4762(00)B and 4762(00)B-VSB seriesTable 19ARadial internal clearanceSKF unit roller insert bearings are produced as standardwith radial internal clearance within the limits shown inthe table below