Rolling bearings
® SKF, Duoflex, CARB, ICOS, INSOCOAT, KMT, KMTA, Monoflex, Multiflex, NoWear, SensorMount, SKF Explorer, SYSTEM 24 and Wave are registered trademarks of the SKF Group.
™ AMP Superseal 1.6 Series is a trademark of the TE connec
tivity family of companies
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Rolling bearings
Rolling bearings
Unit conversions . . . 8
Foreword . . . 9
This is SKF . . . 14
SKF – the knowledge engineering company . . . 16
Principles of bearing selection and application . . . 18
A Bearing basics . . . 21
Selecting rolling bearings. . . 22
Terminology . . . 23
Bearing types and designs . . . 26
Boundary dimensions. . . 40
Basic bearing designation system . . . 42
Basic selection criteria . . . 46
B Selecting bearing size . . . 61
A systems approach to bearing selection . . . 62
Bearing life and load ratings . . . 63
Selecting bearing size using the life equations . . . 64
Dynamic bearing loads . . . 84
Selecting bearing size using static load carrying capacity . . . 87
Calculation examples . . . 90
SKF calculation tools . . . 92
SKF Engineering Consultancy Services . . . 94
SKF life testing . . . 95
C Friction . . . 97
Estimating the frictional moment . . . 98
Tolerances . . . 132
Bearing internal clearance . . . 149
Materials for rolling bearings . . . 150
F Design considerations . . . 159
Bearing systems . . . 160
Radial location of bearings . . . 165
Axial location of bearings . . . 204
Design of associated components . . . 210
Selecting internal clearance or preload . . . 212
Sealing solutions . . . 226
G Lubrication . . . 239
Basics of lubrication . . . 240
Grease lubrication . . . 242
Lubricating greases . . . 244
SKF greases . . . 249
Relubrication . . . 252
Relubrication procedures . . . 258
Oil lubrication . . . 262
H Mounting, dismounting and bearing care . . . 271
General . . . 272
Mounting . . . 275
Dismounting . . . 285
Bearing storage . . . 291
Inspection and cleaning . . . 291
Product data . . . 292
1 Deep groove ball bearings . . . 295
Product tables 1.1 Single row deep groove ball bearings . . . 322
1.2 Capped single row deep groove ball bearings . . . 346
1.3 ICOS oil sealed bearing units . . . 374
1.4 Single row deep groove ball bearings with a snap ring groove . . . 376
1.5 Single row deep groove ball bearings with a snap ring and shields . . . 382
1.6 Stainless steel deep groove ball bearings . . . 386
1.7 Capped stainless steel deep groove ball bearings . . . 394
1.8 Single row deep groove ball bearings with filling slots . . . 410
1.9 Single row deep groove ball bearings with filling slots and a snap ring . . . 414
1.10 Double row deep groove ball bearings . . . 416
2 Y-bearings (insert bearings) . . . 421
Product tables 2.1 Ybearings with grub screws, metric shafts . . . 458
2.2 Ybearings with grub screws, inch shafts . . . 460
2.3 Ybearings with an eccentric locking collar, metric shafts . . . 464
2.4 Ybearings with an eccentric locking collar, inch shafts . . . 466
2.5 SKF ConCentra Ybearings, metric shafts . . . 468
2.6 SKF ConCentra Ybearings, inch shafts . . . 469 3
2.9 Ybearings with a standard inner ring, metric shafts . . . 472
3 Angular contact ball bearings . . . 475
Product tables 3.1 Single row angular contact ball bearings . . . 506
3.2 Double row angular contact ball bearings . . . 522
3.3 Capped double row angular contact ball bearings . . . 526
3.4 Fourpoint contact ball bearings . . . 530
4 Self aligning ball bearings . . . 537
Product tables 4.1 Selfaligning ball bearings . . . 552
4.2 Sealed selfaligning ball bearings . . . 560
4.3 Selfaligning ball bearings with an extended inner ring . . . 562
4.4 Selfaligning ball bearings on an adapter sleeve . . . 564
5 Cylindrical roller bearings . . . 567
Product tables 5.1 Single row cylindrical roller bearings . . . 604
5.2 Highcapacity cylindrical roller bearings . . . 640
5.3 Single row full complement cylindrical roller bearings . . . 644
5.4 Double row full complement cylindrical roller bearings . . . 656
5.5 Sealed double row full complement cylindrical roller bearings . . . 668
6 Needle roller bearings . . . 673
Product tables 6.1 Needle roller and cage assemblies . . . 722
6.2 Drawn cup needle roller bearings . . . 730
6.3 Needle roller bearings with machined rings with flanges, without an inner ring . . . 744
6.4 Needle roller bearings with machined rings with flanges, with an inner ring . . . 758
6.5 Needle roller bearings with machined rings without flanges, without an inner ring . . . 770
6.6 Needle roller bearings with machined rings without flanges, with an inner ring . . . 774
6.7 Alignment needle roller bearings, without an inner ring . . . 776
6.8 Alignment needle roller bearings with an inner ring . . . 778
8 Spherical roller bearings . . . 879
Product tables 8.1 Spherical roller bearings . . . 904
8.2 Sealed spherical roller bearings . . . 928
8.3 Spherical roller bearings for vibratory applications . . . 936
8.4 Spherical roller bearings on an adapter sleeve . . . 940
8.5 Spherical roller bearings on a withdrawal sleeve . . . 946
8.6 Sealed spherical roller bearings on an adapter sleeve . . . 954
9 CARB toroidal roller bearings . . . 957
Product tables 9.1 CARB toroidal roller bearings . . . 980
9.2 Sealed CARB toroidal roller bearings . . . 996
9.3 CARB toroidal roller bearings on an adapter sleeve . . . 1000
9.4 CARB toroidal roller bearings on a withdrawal sleeve . . . 1004
10 Thrust ball bearings . . . 1009
Product tables 10.1 Single direction thrust ball bearings . . . 1016
10.2 Single direction thrust ball bearings with a sphered housing washer . . . 1026
10.3 Double direction thrust ball bearings . . . 1030
10.4 Double direction thrust ball bearings with sphered housing washers . . . 1034
11 Cylindrical roller thrust bearings . . . 1037
Product table 11.1 Cylindrical roller thrust bearings . . . 1048
12 Needle roller thrust bearings . . . 1057
Product tables 12.1 Needle roller and cage thrust assemblies and appropriate washers . . . 1070
12.2 Needle roller thrust bearings with a centring flange and appropriate washers . 1074 13 Spherical roller thrust bearings . . . 1077
Product table 13.1 Spherical roller thrust bearings . . . 1090
14 Track runner bearings . . . 1099
Product tables 14.1 Single row cam rollers . . . 1126
14.2 Double row cam rollers . . . 1128
14.3 Support rollers without flange rings, without an inner ring . . . 1130
14.4 Support rollers without flange rings, with an inner ring. . . 1132
14.5 Support rollers with flange rings, with an inner ring . . . 1134
14.6 Cam followers . . . 1140
15 Engineered products . . . 1149
15A Sensor bearing units . . . 1151
Product table 15A.1 Motor encoder units . . . 1166
5
15B.1 Single row deep groove ball bearings for extreme temperatures . . . 1178
15B.2 Ybearings for extreme temperatures, metric shafts . . . 1182
15B.3 Ybearings for extreme temperatures, inch shafts . . . 1183
15C Bearings with Solid Oil . . . 1185
15D SKF DryLube bearings . . . 1191
15E INSOCOAT bearings . . . 1205
Product tables 15E.1 INSOCOAT deep groove ball bearings . . . 1212
15E.2 INSOCOAT cylindrical roller bearings . . . 1214
15F Hybrid bearings . . . 1219
Product tables 15F.1 Hybrid deep groove ball bearings . . . 1230
15F.2 Sealed hybrid deep groove ball bearings . . . 1232
15F.3 XL hybrid deep groove ball bearings . . . 1236
15F.4 Hybrid cylindrical roller bearings . . . 1238
15G NoWear coated bearings . . . 1241
15H Polymer ball bearings . . . 1247
Product tables 15H.1 Polymer single row deep groove ball bearings . . . 1262
15H.2 Polymer thrust ball bearings . . . 1266
16 Bearing accessories . . . 1269
Product tables 16.1 Adapter sleeves for metric shafts . . . 1290
16.2 Adapter sleeves for inch shafts . . . 1298
16.3 Adapter sleeves with inch dimensions . . . 1304
16.4 Withdrawal sleeves . . . 1310
16.5 KM(L) and HM .. T lock nuts . . . 1316
16.6 MB(L) lock washers. . . 1318
16.7 HM(E) lock nuts . . . 1320
16.8 MS locking clips . . . 1324
16.9 N and AN inch lock nuts . . . 1326
16.10 W inch lock washers . . . 1330
16.11 PL inch locking plates . . . 1332
16.12 KMK lock nuts with an integral locking device . . . 1333
16.13 KMFE lock nuts with a locking screw . . . 1334
16.14 KMT precision lock nuts with locking pins . . . 1336
16.15 KMTA precision lock nuts with locking pins . . . 1338
Unit conversions
Unit conversions
Quantity Unit Conversion
Length inch 1 mm 0.03937 in. 1 in. 25,40 mm
foot 1 m 3.281 ft. 1 ft. 0,3048 m
yard 1 m 1.094 yd. 1 yd. 0,9144 m
mile 1 km 0.6214 mi. 1 mi. 1,609 km
Area square inch 1 mm2 0.00155 sqin 1 sqin 645,16 mm2
square foot 1 m2 10.76 sqft 1 sqft 0,0929 m2
Volume cubic inch 1 cm3 0.061 cuin 1 cuin 16,387 cm3
cubic foot 1 m3 35 cuft 1 cuft 0,02832 m3
imperial gallon 1 l 0.22 gallon 1 gallon 4,5461 l
US gallon 1 l 0.2642 US gallon 1 US gallon 3,7854 l
Speed,
velocity foot per second 1 m/s 3.28 ft/s 1 ft/s 0,30480 m/s
mile per hour 1 km/h 0.6214 mph 1 mph 1,609 km/h
Mass ounce 1 g 0.03527 oz. 1 oz. 28,350 g
pound 1 kg 2.205 lb. 1 lb. 0,45359 kg
short ton 1 tonne 1.1023 short ton 1 short ton 0,90719 tonne
long ton 1 tonne 0.9842 long ton 1 long ton 1,0161 tonne
Density pound per cubic inch 1 g/cm3 0.0361 lb/cuin 1 lb/cuin 27,680 g/cm3
Force poundforce 1 N 0.225 lbf. 1 lbf. 4,4482 N
Pressure,
stress pounds per square inch 1 MPa 145 psi 1 psi 6,8948 ¥ 103 Pa
1 N/mm2 145 psi
1 bar 14.5 psi 1 psi 0,068948 bar
Moment poundforce inch 1 Nm 8.85 lbfin 1 lbfin 0,113 Nm
Power footpound per second 1 W 0.7376 ftlbf/s 1 ftlbf/s 1,3558 W
horsepower 1 kW 1.36 hp 1 hp 0,736 kW
Temperature degree Celsius tC = 0.555 (tF – 32) Fahrenheit tF = 1,8 tC + 32
Foreword
This catalogue contains the standard assort
ment of SKF rolling bearings typically used in industrial applications. To provide the highest levels of quality and customer service, these products are available worldwide through SKF sales channels. For information about lead times and deliveries, contact your local SKF representative or SKF Authorized Distributor.
The data in this catalogue reflect SKF’s stateoftheart technology and production capabilities as of 2012. The data contained within may differ from that shown in earlier catalogues because of redesign, technological developments, or revised calculation methods.
SKF reserves the right to continually improve its products with respect to materials, design and manufacturing methods, some of which are driven by technological developments.
Getting started
This catalogue contains detailed information about standard SKF rolling bearings, several special engineered products and bearing accessories. Engineered products include motor encoder units, which can measure the speed and direction of rotation, polymer bear
ings and rolling bearings designed to fulfil add itional requirements, such as:
• extreme temperatures
• electrical insulation
• dry lubrication
• insufficient lubrication
• rapid speed changes
• high vibration levels
• oscillating movements
The first section, which contains general tech
nical information, is designed to help the reader select the best, most effective products
for a particular application. In this section, bearing service life, speed capabilities, fric
tion, general design considerations and lubri
cation are discussed in detail. Installation and maintenance information is also included.
More practical information about mounting and maintenance is provided in the SKF bear- ing maintenance handbook (ISBN
9789197896641).
The latest developments
The main content updates compared to the previous catalogue include the addition of Ybearings and needle roller bearings as well as the following featured products:
SKF Energy Efficient bearings
To meet the everincreasing demand to reduce energy use, SKF has developed the SKF Energy Efficient (E2) performance class of rolling bearings. SKF E2 bearings are charac
terized by a frictional moment in the bearing
SKF Energy Efficient bearings are identified by the designation prefix E2.
9
that is at least 30% lower when compared to a samesized SKF standard bearing.
High-capacity cylindrical roller bearings SKF highcapacity cylindrical roller bearings combine the high load carrying capacity of full complement bearings and the high speed capability of bearings with a cage. They are designed for applications such as industrial gearboxes, gearboxes in wind turbines and mining equipment.
SKF DryLube bearings
SKF DryLube bearings are a new option for extreme temperature applications. They are filled with a dry lubricant, based on graphite and molybdenum disulfide. The dry lubricant can protect the rolling elements and raceways from damage caused by solid contaminants.
SKF DryLube bearings provide effective lubri
cation for high temperature applications, low startup torque at any temperature and low frictional moment during operation.
Polymer ball bearings
Polymer ball bearings are an excellent solution from both a technical and economic perspec
tive, in applications where resistance to mois
ture or chemicals is essential. Polymer ball bearings use bearing rings or washers made of various polymer materials and balls made of glass, stainless steel or polymers. They are lightweight, self lubricating, quiet running, and resistant to corrosion, chemicals and wear and fatigue.
SKF ConCentra Y-bearings (insert bearings) The SKF ConCentra locking technology pro
vides a true concentric fit of the bearing on a shaft, to virtually eliminate fretting corrosion.
SKF high-capacity cylindrical roller bearing
SKF DryLube bearing
Polymer ball bearing
Printed and cut tabs simplify navigation Grease life estimation for capped bearings Grease life calculation for capped deep groove
ball bearings
Capped deep groove ball bearings and Ybear
ings (insert bearings) are typically greased for life. SKF did extensive research to enable a theoretical approach to estimate the grease life depending on bearing speed, operating temperature, load and other factors.
Extended assortment for value-added bearings The assortment of capped bearings, SKF Explorer bearings, electrically insulated bear
ings and hybrid bearings has been extended.
How to use this catalogue
This catalogue is divided into two main sec
tions: a technical section and a product sec
tion. The technical section describes in detail how to select and apply rolling bearings and covers eight main topics marked with printed tabs from A to H. The product section is div
ided into chapters by product type. Each chapter contains specific information about the bear
ing type and its optional variants and product tables. Each product chapter is clearly marked by cut tabs with an easily identifiable icon.
Find information quickly
The catalogue is designed so that specific information can be found quickly. At the front of the catalogue there is the full table of con
tents. At the back, there is a product index and a full text index.
A comprehensive text index helps to locate specific information quickly.
or capped bearings Grease life for capped bearings should be esti- mated according to the procedure described in this section. T
he grease life for capped bear- ings is presented as L10
, i.e. the time period at the end of w
hich 90% of the bearings are still reliably lubricated. The m
ethod to estimate relubrication intervals († Relubrication inter- vals, page 252
) represents the L01 grease life and should nThe grease lot be used.
ife for capped bearings depends on the operating temperature and the speed factor. It can be obtained f
rom the diagrams.
Diagram 1 is valid for s
tandard deep groove ball bearings. The grease performance factor (GPF) is listed in table 4 († p
age 305).
Diagram 2 is valid for SKF Energy Efficient deep groove
ball bearings.
The grease life for each is valid under the following operating conditions:
Diagram 1 Grease life for capped d
eep groove ball bearings where P = 0,05 C
n = rotation al speed [r/min]
dm = bearing m ean diameter [mm]
= 0,5 (d + D) 100 000
n dm = 100 000
n dm = 20 000 10 000
1 000
100
200 000 300 000 400 000 500 000 600 000 700 000
GPF = 1 GPF = 2 GPF = 4 40
55 70 45 7560 50 8065
55 70 85 7560 90 65 9580 70 10085 75 90 105 9580 110
10085 115 90 120105 95 110 125 100 115 130 120105 135 110 140125
115 130 145 Grease life L10 [h]
Operating tem perature [°C]
for various g
rease performance factors (GPF) horizontal shaft
• inner ring rotation
• light load (
• operating temP ≤ 0,05 C)perature w ithin the green
•
temperature zone of the grease († table 4
, page 305) stationary machine
• low vibration levels
• For stainless s
teel bearings filled with VT378 grease, use the scale corresponding to GPF = 1 and multiply t
he value obtained from the dia- gram by 0,2.
Bearing types a306 nd designs
Track runner bearings Track runner bearings († p
age 1099) are bearings with a t
hick walled o
uter ring. These ready-to-m
ount units are used in all types of cam drives, t
racks and conveyor systems.
Tapered roller thrust bearings1) single direction with or witho
ut (70) a cover screw down bearings double direction (71)
Cam rollers single row (72) double row (73)
Support rollers
without flangwith or withowith an inner rwithout an ine rings ut contact seaner ring ing (74) ls
with flange rings, based o
n needle roller bearings
with or withowith a full comwith a cage-gut contact seauided roller sls et (75) plement roller set
74
75
70
71
72
73
1) Refer to product information available online at skf.com/bearings or separate catalogue.
35
A Deep groove b
all bearings 1 Y-bearings (ins
ert bearings ) 2 Angular co
ntact ball bea rings 3 Self-aligning b
all bearings 4 Cylindrical r
oller bearings 5 Needle roller b earings 6 Tapered rolle r bearings 7 Spherical rolle r bearings 8 CARB toroida l roller bearin g 9
Thrust ball b earings 1 0 Cylindrical r Needle roller t oller thrust b earings 1 1
hrust bearin gs 12 Spherical rolle r thrust bear ings 13
Track runner b earings 1 4 Engineered p roducts 1 5 Bearing acce ssories 1 6
Text index
A
A angular contact ball bearin gs 479, 504 lock nuts and locking devices 1280, 1289 motor encoder units 1161 track runner bearings 1
103, 1107, 1125 ABMA standards 41
abutment col lars 206 abutments
dimensions 208–209 tolerances 169, 200–202 AC 504
AC current protection w
ith hybrid bearings 1220, 1226 protection w
ith INSOCOAT bearings 1209 AC motors 1152
accessories 1269–1341 acetone 1251 acids
resistance of polymer ball b earings 1251 resistance o
f seal materials 156–157 acrylonitrile-butadiene rubber (NBR) 155
hydrogenated acrylonitrile-butadiene rubber (HNBR) 156 ADA 580, 602
adapter sleevbearing seat taxial load cares 1270–12rying capacity 8olerances 274, 1290–1394 09 00–201 coatings 1270
designation system 1288–1289 designs and variants 1270–1273 dimension stan
dards 1274 dismounting bearings 288–289
for CARB toroidal roller bearings 975, 1000–1003, 1273 for inch shafts 1298–1303
for metric shafts 1290–1297 for oil injection 1270–1272
for self-aligning ball bearings 546–547, 564–565, 1273 for spherical roller bearings 898–899, 940–945, 954–955,
1273
for Y-bearings 422–423, 427, 470–471 mounting bearings 278 on a stepped s
haft 207, 1270 product tables 1290–1309 spacer rings 2
07, 1270 tapers 1274 threads 1274 tolerances 1274 with inch dim
ensions 1304–1309 adapters 11
08, 1110 ADB 580, 602 additives
in grease 244, 248, 254 in oil 265–266 adjusted bearing systems 163 adjusted refadjustment faerence speed 120 ctors 121–124
calculation examples 125 compared to l
imiting speed 126 adjusting beafor preload 2for internal cangular contarings learance 2ct ball bearin77gs 498
18–220 procedures 221–225 tapered roller bearings 816–817 AFBMA standards 41 agricultural aspecification land Y-bearinpplications gs 435, 446ife 83 –447 AH 457
alcohols 1251 alignment n
eedle roller bearings 6 83, 776–779 cages 69
3–695, 714 designs and variants 683 dimension stan
dards 703 fits and tolerance classes 716 internal clear
ance 702–703 loads 711 misalignment 52, 702–703 mounting 718 product tables 776–779 temperatur
e limits 714 tolerances 702–703 aliphatic hydrresistance oocarbons
f fluoro rubber 156 resistance of polymer ball b
earings 1251 alkalis
resistance of
polymer ball bearings 1251 resistance of polyurethane 157 Allen wrenches † h
exagonal keys aluminiumin polymer b oxide (Al2O3)
all bearings 1251, 1260 on INSOCOAT bearings (coating) 1206 ambient temperature 240 amines 156 ammonia 152, 154
AMP Superseal™ connectors 1154, 1155, 1161 angle rings 5
71, 604–639 angle series 40 angular contact ball bearin
gs 475–535 adjustment d
uring mounting 221–225, 277 assortment 4
76, 500–502 axial load carrying capacity 476, 498 bearing arrangements 160–163 cages 480
–481, 497 combined with a needle r
oller bearing 6 84–685, 780–783 contact angle 4
76, 486–487, 498, 504 design provisions 498–499 designation system 504–505 designs and v
ariants 28, 476–484 dimension standards 486–487 dimensional stability 497 double row bearings 4
78–479, 522–529 for universal matching 4
77, 500, 506–521 four-point c
ontact ball bearings 4 80, 530–535 Note: Designation prefixe
s and suffixes are shown in bold.
1343
Index
11
