Ball and Roller Bearings Machinery's Handbook, 31st Edition
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Table 31. Values of f c for Radial Roller Bearings
cos d m
cos d m
cos d m
D
D
D
f c
f c
f c
α
α
α
Metric a
Inch b 4680 5460 5970 6350 6660 6910 7120
Metric a
Inch b 7980 7980 7970 7950 7920 7890 7850
Metric a
Inch b 7140 7060 6970 6890 6800 6700 6610
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17
52.1 60.8 66.5 70.7 74.1 76.9 79.2 81.2 82.8 84.2 85.4 86.4 87.1 87.7 88.2 88.5 88.7
0.18 0.19 0.20 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30 0.31 0.32 0.33 0.34
88.8 88.8 88.7 88.5 88.2 87.9 87.5 87.0 86.4 85.8 85.2 84.5 83.8 83.0 82.2 81.3 80.4
0.35 0.36 0.37 0.38 0.39 0.40 0.41 0.42 0.43 0.44 0.45 0.46 0.47 0.48 0.49 0.50
79.5 78.6 77.6 76.7 75.7 74.6 73.6 72.5 71.4 70.3 69.2 68.1 67.0 65.8 64.6 63.5
7290 7440 7570 7670 7760 7830 7880 7920 7950 7970
7810 7760 7710 7650 7590 7520 7450 7380 7300 7230
6510 6420 6320 6220 6120 6010 5910 5810 5700
… … …
a For α = 0°, F a = 0 and X = 1. b Use to obtain C in pounds when l
eff and D are given in inches. Table 32. Values of f c for Thrust Roller Bearings
45 ° < α < 60 °
60 ° < α < 75 °
75 ° ≤ α < 90 °
α = 90 °
cos d m
D
D
α
f c
f c
d
m
Metric a Inch b Metric a Inch b Metric a Inch b 127.8 11460 124.7 11180 123.0 11030 139.5 12510 136.2 12220 134.3 12050 148.3 13300 144.7 12980 142.8 12810 155.2 13920 151.5 13590 149.4 13400 109.7 9840 107.1 9610 105.6 9470 160.9 14430 157.0 14080 154.9 13890 165.6 14850 161.6 14490 159.4 14300 169.5 15200 165.5 14840 163.2 14640 172.8 15500 168.7 15130 166.4 14930 175.5 15740 171.4 15370 169.0 15160 179.7 16120 175.4 15730 173.0 15520 182.3 16350 177.9 15960 175.5 15740
Metric a
Inch b 9500 11000 12100 12800 13200 14100 14500 15100 15400 15900 16300 17000 17500 18000 18500 18800 19100 19600 19900 20100
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.12 0.14 0.16 0.18 0.20 0.22 0.24 0.26 0.28 0.30
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.12 0.14
105.4 122.9 134.5 143.4 150.7 156.9 162.4 167.2 171.7 175.7 183.0 189.4 195.1 200.3 205.0 209.4 213.5 217.3 220.9 224.3
183.7 16480 179.3 16080 184.1 16510 179.7 16120 183.7 16480 179.3 16080
… … 0.16 … … 0.18 … … 0.20
182.6 16380 180.9 16230 178.7 16030
… … … … 0.22 … … … … 0.24 … … … … 0.26
………………0.28 ………………0.30
a Use to obtain C b Use to obtain C
a in newtons when l eff and D are given in mm.
a in pounds when l eff and D are given in inches. Roller Bearing Rating Life.— The Rating Life L 10 of a group of apparently identical roller bearings is the life in millions of revolutions that 90 percent of the group will com plete or exceed. For a single bearing, L 10 also refers to the life associated with 90 percent reliability.
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