"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:

Where: L ₁₀ = 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=XF_R + YF_A

Where:
P = Equivalent radial load, lbs.
F _R = Radial load, lbs. - (See Table 1
for allowable slip fit maximum)
F _A = 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 F_A/F_R and compare to e. Determine X and Y from Table 1. Light thrust F_A/F_R less than or equal to e or heavy thrust F_A/F_R 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 F_R use P = F_R.

Table 1 - Radial/Thrust Factors

Shaft
Size

F_A/F_R < or = e

F_A/F_R > e

Dynamic Capacity
C90 *

Maximum
RPM

Maximum
Slip Fit Radial
Load, FA **

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	Shaft Sizes	L10 Hours Life *	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.