MIL-DTL-21248C
TABLE XV. Radial Kink Limitations for Type I, Classes 2, 4
and 10; Type II, Class 2; and Type III, Class 2 Retaining Rings.
Ring Size
Dimension V (max)
(inches)
(inches)
0.125 through 0.750
0.016
0.781 through 1.500
0.031
1.562 through 2.500
0.047
2.562 through 5.000
0.078
Over
5.000
0.125
3.5.4.4.4 Type I, Class 7 retaining rings. Radial kink (dimension V) shall not exceed 3 percent
of the nominal free diameter of the applicable size ring.
3.5.4.5 Pitch. The pitch of retaining rings (see Figure 17) shall not exceed the limitations
specified in 3.5.4.5.1 through 3.5.4.5.3 for the applicable type and class of ring.
FIGURE 17. Helix.
3.5.4.5.1 Type I, Classes 1, 2, 3, 4 and 10; Type II, Classes 1 and 2; and Type III, Classes 1
and 2. The pitch of the ring shall not exceed 2 T, Where "T" equals thickness.
3.5.4.5.2 Type I, Classes 5, 6 and 9; Type II, Classes 3 and 4. The pitch of the ring shall not
exceed ½ "T" for ring sizes up to and including 0.500 inch and "T" for ring sizes over 0.500 inch.
3.5.4.5.3 Type I, Classes 7 and 8. The pitch of the ring shall not exceed ½ T.
3.5.4.6 Permanent set. All retaining rings shall be capable of undergoing the tests of 4.3.2
without showing any evidence of cracking and without taking a permanent set in excess of the
limitations specified in 3.5.4.6.1 through 3.5.4.6.5 for the applicable type and class of ring.
3.5.4.6.1 Type I, Class 1; Type II, Class 1; and Type III, Class 1 retaining rings. The rings shall
not crack and the permanent set shall not exceed the limitations specified in Table XVI.
TABLE XVI. Permanent Set Limits for Class 1 Retaining Rings.
Permanent Set (max)
Ring Size
(Percent of Free Diameter)
(inches)
Carbon Steel and
Corrosion Resistant
Beryllium-Copper
Steel
0.250 through 0.453
3.5
3.8
0.500 through 3.500
3.0
3.0
3.543 and over
2.5
2.5
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