MIL-DTL-21248C
3.5.4.3.3 Type III rings. Bevel edge dimension "U" plus dimension "d", and thickness dimension
"T" plus dimension "d" shall not exceed the limitations of dimensions "U" or "T" respectively, as
specified on the MS Drawing for the applicable class and size of ring.
3.5.4.4 Radial kink. The radial kink of retaining rings shall not exceed the limitations specified in
3.5.4.4.1 through 3.5.4.4.4 for the applicable type and class of ring.
3.5.4.4.1 Type I, Classes 1 and 3; Type II, Class 1; and Type II, Class 1 retaining rings.
Dimension "V" (see Figure 15) shall not exceed the limitations specified in Table XIV for the
applicable size ring.
FIGURE 15. Radial Kink, Internal Rings.
TABLE XIV. Radial Kink Limitations for Type I, Classes 1
and 3; Type II, Class 1; and Type III, Class 1 Retaining Rings.
Ring Size
Dimension V (max)
(inches)
(inches)
0.250 through 0.750
0.020
0.777 through 1.500
0.031
1.562 through 2.500
0.062
2.531 through 5.000
0.094
Over
5.000
0.124
3.5.4.4.2 Type I, Classes 2, 4 and 10; Type II, Class 2; and Type III, Class 2 retaining rings.
Dimension "V" (see Figure 16) shall not exceed the limitations specified in Table XV for the applicable
size ring.
3.5.4.4.3 Type I, Classes 5, 6, 8 and 9; and Type II, Classes 3 and 4 retaining rings. Radial
kink (dimension V, Figure 16) readily visible to the normal eye will not be acceptable.
FIGURE 16. Radial Kink, External Rings.
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