top edge

"Type E" Bearings - Selection

Royersford "Type E" tapered-roller bearings have the capacity to carry heavy radial loads, thrust loads and combined radial/thrust loads.  The maximum recommended load which can be applied is limited by various components in the system, such as bearing, housing, shaft, shaft attachment, speed and life requirements as listed in this catalog.

Select a bearing from the "Type E" Selection Chart having a radial load rating at operating speed equal to or greater than the calculated "Equivalent Radial Load" for a desired L10 Life.  This simple method is all that is required for the majority of general applications and provides for occasional average shock loads.  (Equivalent Radial    Load = P.)

L10 Hours Life - is the life which may be expected from at least 90% of a given group of bearings operating under identical conditions.

For a L10 Hours Life other than those listed in the selection chart, multiply the Equivalent Radial Load by one of the following factors.  For 50,000 L10 Hours Life use factor of 1.16; 80,000, 1.34.  Then select a bearing from the bold face (30,000) L10 ratings only in the selection chart having rating equal to or greater than this value.

Heavy Service - For heavy shock loads, frequent shock loads or severe vibrations, add up to 50% (according to severity of conditions) to the Equivalent Radial Load to obtain a Modified radial Load.

Thrust load values shown in the table below are recommended as a guide for general applications that will give adequate L10 Life.  Where substantial radial load is also present, it is advisable to calculate the L10 Life to assure it meets the requirements.  The maximum thrust load should not exceed the limits shown in the table labeled "Allowable Thrust-Pillow Block Housings."  The effectiveness of the shaft attachment to carry thrust load depends on proper tightening of the setscrews, shaft tolerance, and shaft deflections.  Therefore, it is advisable to use auxiliary thrust carrying devices such as shaft shoulder, snap ring, or a thrust collar to locate the bearing under heavier thrust loads or where extreme reliability is desired.

The shaft tolerances recommended are adequate for normal radial, thrust, and radial/thrust load applications.  The radial load is limited by the attachment to the shaft (see Table 1).  Since the allowable load, especially at low speed, is very large, the shaft should be checked to assure adequate shaft strength.

The magnitude and direction of both the thrust and radial load must be taken into account when selecting a housing.  When pillow blocks are utilized, heavy loads should be directed through the base.  Where a load pulls the housing away from the mounting base, both the hold-down bolts and housing must be of adequate strength.  Auxiliary load carrying devices such as shear bars are advisable for side or end loading of pillow blocks and radial loads for flange units.  To determine the L10 Hours Life for loads and RPM's not listed, use the following equation:

equation Where: L10 = Life, Hours
C90 = Dynamic Capacity, lbs. (Table 1)
P = Equivalent Radial Load, lbs.

When the load on a two row roller bearing is solely a radial load with no thrust (axial) load, the load is shared equally by both rows of rollers and the equivalent radial load (P) is equal to the actual radial load.  However, when a thrust (axial) load is applied, the loading on the two rows is shared unequally depending on the ratio of thrust to radial load.  The use of the X (radial factor) and Y (thrust factor) from Table 1 convert the actual applied thrust and radial loads to an equivalent radial load which has the same effect on the life of a bearing as a radial load of the magnitude.

P=XFR + YFA

Where:
P  =   Equivalent radial load, lbs.
FR =  Radial load, lbs. - (See Table 1
for allowable slip fit maximum)
FA = Thrust (axial) load, lbs.
e  =   Thrust load to radial load factor
(Table 1)
X  =  Radial load factor (Table 1)
Y  =  Thrust load factor (Table 1)

To find X and Y, first calculate FA/FR and compare to e.  Determine X and Y from Table 1.  Light thrust FA/FR less than or equal to e or heavy thrust FA/FR greater than e.

Substitute all known values into the equivalent radial load equation.  The equivalent radial load (P) thus determined can be used in the L10 life formula or compared to the allowable equivalent radial load rating desired in the expanded rating table below to select a bearing.

If calculated value of P is less than FR use P = FR.

Table 1 - Radial/Thrust Factors

Shaft
Size
e FA/FR < or = e FA/FR > e Dynamic Capacity
C90 *
Maximum
RPM
Maximum
Slip Fit Radial
Load, FA **
X Y X Y Lbs. Newtons
1 3/16  -  1 1/4
1 3/8  -  1 7/16
1 1/2  -  1 11/16
1 3/4  -  2
2 3/16
2 1/4  -  2 1/2
2 11/16  -  3 1/2
3 3/16  -  3 1/2
3 15/16  -  4
4 7/16  -  4 1/2
4 15/16  -  5 
.49
.46
.44
.33
.36
.40
.46
.50
.49
.53
.47
.87
.87
.87
.87
.87
.87
.87
.87
.87
.87
.87
1.77
1.89
1.96
2.64
2.38
2.17
1.87
1.71
1.77
1.63
1.83
.70
.70
.70
.70
.70
.70
.70
.70
.70
.70
.70
2.14
2.28
2.37
3.18
2.87
2.63
2.26
2.07
2.14
1.97
2.21
2.980
4.760
6.140
8.070
8.550
9.090
9.600
15.300
21.000
25.800
35.500
13.260
21.180
27.320
35.908
38.044
40.447
42.716
68.078
93.440
114.799
157.959
4.490
3.820
3.320
3.050
2.730
2.420
2.060
1.640
1.530
1.360
1.200
3,100
5,000
6,400
8,400
8,900
9,500
10,000
16,000
22,000
27,000
35,000

Allowable Thrust - Pillow Block Housing

Bore Size 1 3/16 - 1 1/4 1 3/8 - 1 7/16 1 1/2 - 1 11/16 1 3/4 - 2 2 3/16 2 1/4 - 2 1/2 2 11/16 - 3 3 3/16 - 3 1/2 3 15/16 - 4 4 7/16 - 4 1/2 4 15/16 - 5
2 - Bolt 1300 2200 2200 2300 3300 3300 4500 5500 ----- ----- -----
4 - Bolt ----- ----- ----- ----- ----- 3300 4500 16500 14600 13400 10600
*    C90 - Dynamic capacity based on a rated life of 90 million revolutions or 3000 hours at 500 RPM.
**  If load exceeds maximum allowable slip fit radial load (FR), line to the t-light press fit of shaft required.  Maximum slip fit
      radial loads are recommended shaft tolerances are used.

Radial Load Ratings in Pounds

Dynamic Capacity C90

Shaft
Sizes

L10
Hours Life
*

Allowable Equivalent Radial Load Ratings (lbs.) at Various Revolutions Per Minute

LBS

Newtons

10

25

50

100

250

500

750

1000

1250

1500

1750

2000

2500

3000

3500

3040

13523

1 3/16
1 1/4

10,000
30,000
40,000
60,000
100,000

6850
4927
4519
4002
3433

5204
3743
3433
3040
2608

4227
3040
2789
2469
2118

3433
2469
2265
2006
1721

2608
1876
1721
1524
1307

2118
1524
1398
1238
1062

1876
1349
1238
1096
940

1721
1238
1135
1005
862

1609
1157
1062
940
807

1524
1096
1005
890
764

1455
1046
960
850
729

1398
1005
922
816
700

1307
940
862
764
655

1238
890
816
723
620

1182
850
780
690
592

4860

2168

1 3/8
1 7/16

10,000
30,000
40,000
60,000
100,000

10951
7876
7225
6398
5489

8319
5983
5489
4860
4169

6757
4860
4458
3948
3387

5489
3948
3621
3206
2751

4169
2999
2751
2436
2090

3387
2436
2234
1978
1607

2999
2157
1978
1752
1503

2751
1978
1815
1607
1379

2573
1850
1697
1503
1289

2436
1752
1607
1423
1221

2326
1673
1534
1359
1166

2234
1607
1474
1305
1120

2090
1503
1379
1221
1047

1978
1423
1305
1156
992

1889
1359
1246
1104
947

6260

27846

1 1/2
1 5/8
1 11/16

10,000
30,000
40,000
60,000
100,000

14106
10145
9306
8241
7070

10716
7707
7070
6260
5371

8704
6260
5742
5085
4362

7070
5085
4664
4130
3543

5371
3863
3543
3137
2692

4362
3137
2878
2548
2186

3863
2778
2548
2257
1936

3543
2548
2338
2070
1776

3314
2383
2186
1396
1661

3137
2257
2070
1833
1572

2996
2155
1976
1750
1501

2878
2070
1899
1681
1442

2692
1936
1776
1572
1349

2548
1833
1681
1489
1277

-----
-----
-----
-----
-----

8230

36609

1 3/4
1 7/8
1 15/16
2

10,000
30,000
40,000
60,000
100,000

18545
13338
12235
10834
9295

14088
10132
9295
8230
7061

11443
8230
7550
6685
5735

9295
6685
6132
5430
4658

7061
5078
4658
4125
3539

5735
4125
3784
3350
2874

5078
3652
3350
2967
2545

4658
3350
3073
2721
2335

4357
3133
2874
2545
2184

4125
2967
2721
2410
2067

3938
2833
2598
2301
1974

3784
2721
2496
2210
1896

3539
2545
2335
2067
1774

3350
2410
2210
1957
1679

-----
-----
-----
-----
-----

8720

38788

2 3/16

10,000
30,000
40,000
60,000
100,000

19649
14132
12964
11479
9848

14927
10736
9848
8720
7481

12124
8720
7999
7083
6076

9848
7083
6497
5753
4936

7481
5381
4936
4370
3749

6076
4370
4009
3550
3045

5381
3870
3550
3143
2697

4936
3550
3256
2883
2474

4616
3320
3045
2697
2314

4370
3143
2883
2553
2190

4173
3001
2753
2438
2091

4009
2883
2645
2342
2009

3749
2697
2474
2190
1879

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

9270

41235

2 1/4
2 7/16
2 1/2

10,000
30,000
40,000
60,000
100,000

20888
15023
13781
12203
10469

15868
11413
10469
9270
7953

12889
9270
8504
7530
6460

10469
7530
6907
6116
5247

7953
5720
5247
4646
3986

6460
4646
4262
3774
3238

5720
4114
3774
3342
2867

5247
3774
3462
3065
2630

4907
3529
3238
2867
2459

4646
3342
3065
2714
2329

4436
3191
2927
2591
2223

4262
3065
2812
2490
2136

3986
2867
2630
2329
1998

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

9790

43548

2 11/16
2 3/4
2 15/16
3

10,000
30,000
40,000
60,000
100,000

22060
15866
14554
12887
11056

16758
12053
11056
9790
8339

13612
9790
8981
7952
6822

11056
7952
7294
6459
5541

8399
6041
5541
4907
4209

6822
4907
4501
3985
3419

6041
4345
3985
3529
3028

5541
3985
3656
3237
2777

5182
3727
3419
3028
2597

4907
3529
3237
2866
2459

4685
3369
3091
2737
2348

4501
3237
2969
2629
2256

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

15600

69392

3 3/16
3 1/4
3 7/16
3 1/2

10,000
30,000
40,000
60,000
100,000

35152
25282
23192
20536
17618

26704
19206
17618
15600
13384

21690
15600
14310
12671
10871

17618
12671
11623
10292
8830

13384
9626
8830
7819
6708

10871
7819
7172
6351
5448

9626
6923
6351
5623
4824

8830
6351
5826
5158
4425

8258
5939
5448
4824
4139

7819
5623
5158
4568
3919

7465
5369
4925
4361
3741

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

21400

95192

3 15/16
4

10,000
30,000
40,000
60,000
100,000

48222

34682
31814
28171
24168

36632
26346
24168
21400
18359

29754
21400
19631
17382
14912

24168
17382
15945
14119
12113

18359
13205
12113
10725
9202

14912
10725
9839
8712
7474

13205
9497
8712
7714
6618

12113
8712
7991
7076
6071

11328
8148
7474
6618
5678

10725
7714
7076
6266
5375

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----

-----
-----

26300

116988

4 7/16
4 1/2

10,000
30,000
40,000
60,000
100,000

59263
42623
39099
34621
29702

45020
32379
29702
26300
22563

36567
26300
24125
21362
18327

29702
21362
19596
17352
14886

22563
16228
14886
13181
11308

18327
13181
12091
10706
9185

16228
11672
10706
9480
8133

14886
10706
9821
8696
7461

13922
10013
9185
8133
6978

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

36200

161026

4 15/16
5

10,000
30,000
40,000
60,000
100,000

81571
58668
53817
47653
40882

61966
44567
40882
36200
31057

50332
36200
33207
29404
25226

40882
29404
26972
23883
20490

31057
22337
20490
18143
15565

25226
18143
16643
14737
12643

22337
16065
14737
13049
11195

20490
14737
13518
11970
10269

19163
13782
12643
11195
9604

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

-----
-----
-----
-----
-----

*  "Minimum Hours Life" is the life which may be expected from at least 90% of a given group of bearings operating under identical conditions.
The average life will be approximately five times the minimum life.

Note:  Because the allowable loads, especially at low speeds, are extremely high, be sure that the shaft strength is adequate and pillow blocks are
base loaded.  When the load line falls outside the base, fastener and housing deflection or failure may occur.  These conditions require
designs using proper engineering principles applied to materials, fasteners, mounting and etc. with adequate safety factors.