MIL-DTL-27426C
3.2.1 Carbon steel rings. Carbon steel retaining rings shall have a tensile
strength and a hardness conforming to ANSI B27.6 (reference).
3.2.2 Corrosion-resisting steel rings . Corrosion resisting steel retaining
rings shall meet the physical requirements of AMS5866. Material shall not be rejected
on the basis of hardness, provided that the tensile strength requirements are met.
3.2.3 Copper-beryllium alloy rings . Material used to manufacture copper-
beryllium alloy retaining rings shall meet the tensile requirements of ASTM B197.
3.3 Protective Finish. Protective finish shall conform to 3.3.1, 3.3.2 or 3.3.3
as specified in the contract or purchase order (see 6.2).
3.3.1 Cadmium plating. Cadmium plating shall be in accordance with QQ-P-416,
Type II, Class 2. NOTE: Use of this finish is not recommended.
3.3.2 Phosphate coating.
Phosphate coating shall be in accordance with DOD-P-
16232, Type Z, Class 2.
3.3.3 Passivation.
Corrosion-resisting steel rings shall be passivated in
accordance with QQ-P-35.
3.4 Design. The design, shape, mechanical requirements, and dimensions of
retaining rings furnished under this specification shall conform to all the
requirements specified in 3.4.1 through 3.4.9 for the applicable type, class, and size
of ring.
3.4.1 Type 2A01 rings. Type 2A01 rings shall conform to the dimensions,
tolerance and requirements specified in MIL-DTL-27426/1.
3.4.2 Type 2A02 rings. Type 2A02 rings shall conform to the dimensions,
tolerances and requirements specified in MIL-DTL-27426/2.
3.4.3 Type 2B01 rings. Type 2B01 rings shall conform to the dimensions,
tolerances and requirements specified in MIL-DTL-27426/3.
3.4.4 Type 2B02 rings. Type 2B02 rings shall conform to the dimensions,
tolerances and requirements specified in MIL-DTL-27426/4.
3.4.5 Notches and slots. All rings shall be either notched in accordance with
3.4.5.1 or slotted to facilitate removal of the rings from the grooves, using a
screwdriver or similar common type tool. Special removal tools shall not be required.
Ring sizes 2.750 inches and smaller shall be notched. Unless specified in contract or
order (see 6.2), ring sizes 2.812 inches and larger may be notched or slotted at the
option of the manufacturer.
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