Machinery's Handbook, 31st Edition
RETAINING RINGS 1921 Table 17. Inch Series Internal and External Self-Locking Retaining Rings Internal T C External
C
T
D
D
E
E
Housing
Ring Dimensions
Shaft
Ring Dimensions
Static Thrust Load
Static Thrust Load
Min. D
Max. D
Thick. T
Dia. D
Margin E
Min. D
Max. D
Thick. T
Dia. D
Margin E
0.311 0.313 0.010 0.136 0.040 0.374 0.376 0.010 0.175 0.040 0.437 0.439 0.010 0.237 0.040 0.498 0.502 0.010 0.258 0.040 0.560 0.564 0.010 0.312 0.040 0.623 0.627 0.010 0.390 0.040 0.748 0.752 0.015 0.500 0.060 0.873 0.877 0.015 0.625 0.060 0.936 0.940 0.015 0.687 0.060 0.998 1.002 0.015 0.750 0.060 1.248 1.252 0.015 0.938 0.060 1.436 1.440 0.015 1.117 0.060 1.498 1.502 0.015 1.188 0.060
80 75 70 60 50 45 75 70 70 70 60 60 60
0.093 0.095 0.010 0.250 0.040 0.124 0.126 0.010 0.325 0.040 0.155 0.157 0.010 0.356 0.040 0.187 0.189 0.010 0.387 0.040 0.218 0.220 0.010 0.418 0.040 0.239 0.241 0.015 0.460 0.060 0.249 0.251 0.010 0.450 0.040 0.311 0.313 0.010 0.512 0.040 0.374 0.376 0.010 0.575 0.040 0.437 0.440 0.015 0.638 0.060 0.498 0.502 0.015 0.750 0.060 0.560 0.564 0.015 0.812 0.060 0.623 0.627 0.015 0.875 0.060 0.748 0.752 0.015 1.000 0.060 0.873 0.877 0.015 1.125 0.060 0.998 1.002 0.015 1.250 0.060
15 20 25 35 35 35 40 40 40 50 50 50 50 50 55
60 Source: Industrial Retaining Rings, 6000 Series (internal) and 6100 Series (external). All dimen sions are in inches, thrust loads are in pounds. Thickness indicated is for unplated rings. Standard material: carbon spring steel (SAE 1060-1090). Internal Rings: Thrust loads are for rings made of standard material inserted into cold-rolled, low-carbon housing. Ring Thickness Tolerances: For housing sizes 0.311 through 0.627, ± 0.001; for sizes 0.748 through 1.502, ± 0.002. Ring Diameter Tolerances: For housing sizes 0.311 through 0.439, ± 0.005; for sizes 0.498 through 1.502, ± 0.010. External Rings: Thrust loads are for rings made of standard material installed onto cold-rolled, low-carbon shafts. Ring Thickness Tolerances: For shaft sizes 0.093 through 0.220, ± 0.001; for size 0.239, ± 0.002; for sizes 0.249 through 0.376, ± 0.001; for sizes 0.437 through 1.002, ± 0.002. Ring Diameter Tolerances: For shaft sizes 0.093 through 0.502, ± 0.005; for sizes 0.560 through 1.002, ± 0.010. Centrifugal Capacity: Proper functioning of a retaining ring depends on the ring remain ing seated on the groove bottom. External rings “cling” to the groove bottom because the ring ID is slightly smaller than the diameter at the bottom of the groove. Ring speed should be kept below the allowable steady-state speed of the ring, or self-locking rings specially designed for high-speed applications should be used, otherwise an external ring can lose its grip on the groove. Applications of large retaining rings that tend to spin in their grooves when subjected to sudden acceleration or deceleration of the retained part can benefit from a ring with more “cling” (i.e., a smaller interior diameter) as long as the stress of installation is within permissible limits. Special rings are also available that lock into a hole in the bottom of the groove, thereby preventing rotation. The following equation can be used to determine the allowable steady-state speed N of an external spiral retaining ring:
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