Machinery's Handbook, 31st Edition
RETAINING RINGS
1913
Table 10. Heavy Duty External Spiral Retaining Rings MIL-R-27426 Table 10. (Continued) Heavy Duty External Spiral Retaining Rings MIL-R-27426
Ring
Groove
Static Thrust Load (lb)
Ring
Groove
Static Thrust Load (lb)
Shaft Dia. A
Shaft Dia. A
Dia. G
Wall E
Dia. C
Width D
Dia. G
Wall E
Dia. C
Width D
Ring Ring Groove 2.750 2.584 0.225 2.602 0.103 32140 20380 13.000 12.361 0.662 12.448 0.209 305490 359330 2.875 2.702 0.225 2.721 0.103 33600 22170 13.250 12.598 0.662 12.687 0.209 311360 373530 2.937 2.760 0.225 2.779 0.103 34320 23240 13.500 12.837 0.662 12.927 0.209 317240 387340 3.000 2.818 0.225 2.838 0.103 35060 24340 13.750 13.074 0.662 13.166 0.209 323110 402090 3.062 2.878 0.225 2.898 0.103 35780 25140 14.000 13.311 0.662 13.405 0.209 328990 417110 3.125 2.936 0.225 2.957 0.103 36520 26290 14.250 13.548 0.662 13.644 0.209 334860 432410 3.156 2.965 0.225 2.986 0.103 36880 26860 14.500 13.787 0.750 13.884 0.209 340740 447250 3.250 3.054 0.225 3.076 0.103 37980 28320 14.750 14.024 0.750 14.123 0.209 346610 463090 3.344 3.144 0.225 3.166 0.103 39080 29800 15.000 14.262 0.750 14.363 0.209 352490 478450 3.437 3.234 0.225 3.257 0.103 40170 30980 Groove Source: Spirolox Retaining Rings, RSN Series. All dimensions are in inches. Depth of groove d = ( A − C )/2. Thickness indicated is for unplated rings; add 0.002 to upper tolerance for plated rings. Standard material: carbon spring steel (SAE 1070-1090). Ring Thickness, F : For shaft size 0.469, 0.025; for sizes 0.500 through 0.669, 0.035; for sizes 0.688 through 1.023, 0.042; for sizes 1.062 through 1.500, 0.050; for sizes 1.562 through 2.000, 0.062; for sizes 2.062 through 2.687, 0.078; for sizes 2.750 through 3.437, 0.093; for sizes 3.500 through 5.000, 0.111; for sizes 5.250 through 6.000, 0.127; for sizes 6.250 through 7.250, 0.156; for sizes 7.500 through 15.000, 0.187. Ring Free Diameter Tolerances: For shaft sizes 0.469 through 1.500, +0.000, − 0.013; for sizes 1.562 through 2.000, +0.000, − 0.020; for sizes 2.062 through 2.687, + 0.000, − 0.025; for sizes 2.750 through 3.437, +0.000, − 0.030; for sizes 3.500 through 5.000, +0.000, − 0.035; for sizes 5.250 through 6.000, +0.000, − 0.050; for sizes 6.250 through 7.000, +0.000, − 0.060; for sizes 7.250 through 10.000, +0.000, − 0.070; for sizes 10.250 through 12.500, +0.000, − 0.090; for sizes 12.750 through 15.000, +0.000, − 0.110. Ring Thickness Tolerances: For shaft sizes 0.469 through 1.500, ± 0.002; for sizes 1.562 through 5.000, ± 0.003; for sizes 5.250 through 6.000, ± 0.004; for sizes 6.250 through 15.000, ± 0.005. Groove Diameter Tolerances: For shaft sizes 0.469 through 0.562, ± 0.002; for sizes 0.594 through 1.023, ± 0.003; for sizes 1.062 through 1.500, ± 0.004; for sizes 1.562 through 2.000, ± 0.005; for sizes 2.062 through 5.000, ± 0.006; for sizes 5.250 through 6.000, ± 0.007; for sizes 6.250 through 10.000, ± 0.008; for sizes 10.250 through 12.500, ± 0.010; for sizes 12.750 through 15.000, ± 0.012. Groove Width Tolerances: For shaft sizes 0.469 through 1.023, +0.003, − 0.000; for sizes 1.062 through 2.000, +0.004, − 0.000; for sizes 2.062 through 5.000, +0.005, − 0.000; for sizes 5.250 through 6.000, +0.006; − 0.000; for sizes 6.250 through 7.250, + 0.008, − 0.000; for sizes 7.500 through 15.000, +0.008, − 0.000. Thrust Load Capacity: The most important criterion in determining which ring is best suited for a specific application is thrust load capacity. The strength of the retaining ring and groove must both be considered when analyzing the thrust load capacity of an application to determine whether the groove or the retaining ring is likely to fail first. When a retaining ring application fails, the fault will usually be with the groove, unless the groove material is of very high strength. Ring Material: The standard materials for spiral-wound retaining rings are SAE 1070 to 1090 carbon spring steels and 18-8 type 302 stainless steels. The 1070 to 1090 carbon spring steels provide high-strength retaining rings at low cost. Type 302 stainless steel withstands ordinary rusting. Other materials are used for specialized applications, such as the type 316 stainless frequently used in the food industry. For high-temperature use, superalloy A286 rings can be used at up to 900 ° F (482 °C) and Inconel X-750 at up to 1200 ° F (649 °C). Other materials, such as 316 stainless steel, 17-7PH and Inconel stainless steels are sometimes used for special-purpose and custom-made rings. Standard ring are typically supplied uncoated, however, special finishes such as cadmium, phosphate, zinc, or black oxide coatings for carbon spring steel rings and passivation of stainless steel rings are available.
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