Machinery's Handbook, 31st Edition
RETAINING RINGS
1897
RETAINING RINGS Retaining Rings.— The purpose of a retaining ring is to act as an artificial shoulder that will retain an object in a housing (internal ring), as shown in Fig. 1 , or on a shaft (external ring). Two types of retaining ring are common, the stamped ring and the spiral-wound ring. The stamped-type of retaining ring, or snap ring, is stamped from tempered sheet metal and has a nonuniform cross section. The typical spiral-wound retaining ring has a uniform cross section and is made up of two or more turns of coiled, spring-tempered steel, although one-turn spiral-wound rings are common. Spiral-wound retaining rings provide a continuous gapless shoulder to a housing or shaft. Most stamped rings can only be installed at or near the end of a shaft or housing. The spiral-wound design generally requires installation from the end of a shaft or housing. Both types, stamped and spiral, are usually installed into grooves on the shaft or housing.
Housing
Max. Groove Chamfer or Radius
Retained Part
+ Max. Side Clearance + Max. Retained Part Chamfer or Radius = Maximum Total
Radius or Chamfer
Fig. 1. Typical Retaining Ring Installation Showing Maximum Total Radius or Chamfer ( Courtesy Spirolox Retaining Rings ) In the section that follows, Table 1 through Table 6 give dimensions and data on general- purpose tapered and reduced-cross-section metric retaining rings (stamped-type) covered by ANSI/ASME B27.7-1977 (R2017). Table 1 and Table 4 cover Type 3AM1 tapered external retaining rings, Table 2 and Table 5 cover Type 3BM1 tapered internal rings, and Table 3 and Table 6 cover Type 3CM1 reduced-cross-section external rings. Table 7 through Table 10 cover inch sizes of internal and external spiral retaining rings corresponding to MIL-R-27426 Types A (external) and B (internal), Class 1 (medium duty) and Class 2 (heavy duty). Table 11 through Table 17 cover stamped retaining rings in inch sizes. Table 1. American National Standard Metric Tapered Retaining Rings —Basic External Series.—3AM1 ANSI/ASME B27.7-1977 (R2017) Z W D t
E
d
R
G S Detail of Groove
P
J
Lug configuration for sizes –4, –5 and –6
P
B
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