MIL-DTL-21248C
3.3.1 Hardness. The hardness of retaining rings shall be as specified on the applicable MS
drawing for the type, class, material and size of ring required (see 3.5).
3.3.2 Stress relief. Corrosion resisting steel retaining rings shall be stress relived as required to
meet the physical requirements specified for the respective type, class, material and size of ring
required (see 3.5).
3.4 Protective finish. When specified in the contract or order (see 6.2) retaining rings shall be
plated, treated or coated in accordance with 3.4.1, 3.4.2 or 3.4.3 as applicable.
3.4.1 Cadmium plating. Cadmium plating shall be in accordance with SAE AMS-QQ-P-416,
Type II, Class 3.
3.4.2 Passivation. Corrosion resisting steel rings shall be passivated in accordance with SAE
AMS2700.
3.4.3 Phosphate coating. Phosphate coating shall be in accordance with MIL-DTL-16232,
Type Z, Class 2.
3.5 Design and dimensions. Unless otherwise specified in the contract or order, retaining rings
furnished under this specification shall conform to the design, shape, dimensions and other
requirements, specified on the applicable MS drawing type, class, material, protective finish and
size of retaining ring specified in the contract or order (see 6.2).
3.5.1 Additional thickness tolerance. For plated rings and corrosion resisting steel rings, the
plus thickness tolerance specified in the applicable tables shall be increased as follows:
(a) The additional plus tolerance for Type I, Classes 1, 2, 3, 4, 5, 6, 8, 9 and 10
plated rings and corrosion resisting steel rings shall be:
Ring thickness
Additional thickness tolerance
(inch)
(inch)
0.010 and 0.015
0.0008
0.025 through 0.042
0.0018
Over 0.042
0.002
(b) The additional plus tolerance for Type I, class 7 and all classes of Type II and
Type III plated rings and corrosion resisting steel rings shall be 0.002 inch.
3.5.2 Type I and Type II retaining rings. Type I and Type II retaining rings shall have a regular
rectangular cross section conforming to the limitations specified in 3.5.4.1 and shall otherwise
conform to the requirements of 3.5.2.1 or 3.5.2.2 as applicable.
3.5.2.1 Type I retaining rings. Type I retaining rings shall be flat (not bowed) in the same plane
within limits of 3.5.4.5 and shall conform to the requirements of 3.5.2.1.1 through 3.5.2.1.10 and 3.5.4
as applicable.
3.5.2.1.1 Type I, Class 1 retaining rings. Type I, Class 1 retaining rings shall be similar to
Figure 1 and shall conform to the hardness requirements and the dimensions of MS16625 and the
supplementary dimensions of Table I.
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