Machinery's Handbook, 31st Edition
1920 RETAINING RINGS intended to be used as guidelines by the designer, and to ensure the ring application will withstand published and calculated values of static thrust loads. In analyzing the retaining ring loading conditions, a static, uniformly applied load is usually assumed. Dynamic and eccentric loads, however, are frequently encountered. Eccentric loading occurs when the load is concentrated on a small portion of the ring, such as may be caused by incorrectly machined surfaces, cocking of the retained part, and axial misalignment of parts. Conditions leading to eccentric loading on the ring should be avoided. In addition to the factors that affect the static thrust capacity, applications in which shock or impact loading occurs must be evaluated very carefully and tested in service to assess the effect of the mass and velocity of the retained part striking the ring. Vibration caused by impact loading can also cause the ring to fail if the resonant frequency of the system (retaining ring application) coincides with the resonant frequency of the retaining ring. Table 16. Dimensions of Inch Series Self-Locking External Retaining Rings
A
T
W
L
D
GD
S
U
E
H
Shaft Diameter
Ring
Optical Groove
a Static Thrust Load (lb)
Thickness T
Diameter G
Width W
Margin
Min. D 0.078 0.092 0.123 0.134 0.154 0.185 0.248 0.310 0.373 0.434 0.497 0.622 0.745
Max. D 0.080 0.096 0.127 0.138 0.158 0.189 0.252 0.316 0.379 0.440 0.503 0.628 0.755
Free Dia. A
E Ring Groove
0.074 0.089 0.120 0.130 0.150 0.181 0.238 0.298 0.354 0.412 0.470 0.593 0.706
0.025 0.025 0.025 0.025 0.025 0.035 0.035 0.042 0.042 0.050 0.050 0.062 0.062
10 10 20 20 22 25
0 0 0 0 0 0
The use of grooves with these shaft sizes is not suggested.
0.240 0.041 0.030 35
90
0.303 0.048 0.030 50 110 0.361 0.048 0.030 55 185 0.419 0.056 0.030 60 280 0.478 0.056 0.040 65 390 0.599 0.069 0.045 85 570 0.718 0.069 0.050 90 845
a Thrust Load Safety Factors: Ring, 1; groove, 2. Source: Industrial Retaining Rings, 7100 Series. All dimensions are in inches. Depth of groove d = ( D − G )/2. Standard material: carbon spring steel (SAE 1060-1090). Thickness indicated is for unplated rings; for plated, phosphate coated, and stainless steel rings, the maximum ring thickness may be exceeded by 0.002 inch. Ring Free Diameter Tolerances: For shaft sizes 0.078 through 0.138, +0.002, − 0.003; for sizes 0.154 through 0.252, +0.002, − 0.004; for sizes 0.310 through 0.440, +0.003, − 0.005; for sizes 0.497 through 0.755, +0.004, − 0.006. Ring Thickness Tolerances: For shaft sizes 0.078 through 0.158, ± 0.002; for sizes 0.185 through 0.503, ± 0.003; for sizes 0.622 through 0.755, ± 0.004. Groove Diam eter Tolerances: For shaft sizes less than 0.248, grooves are not recommended; for other sizes, grooves are optional. For shaft sizes 0.248 through 0.316, +0.005, − 0.0015; for sizes 0.373 through 0.628, +0.001, − 0.002; for sizes 0.745 and 0.755, +0.002, − 0.003. Groove Width Tolerances: For shaft sizes 0.248 through 0.379, +0.003, − 0.000; for sizes 0.434 through 0.755, +0.004, − 0.000.
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