MIL-DTL-21248C
4.3.2.1.1.3 Type I, Class 3 retaining rings. Type I, Class 3 rings shall be compressed so that
the open ends of the ring touch but do not overlap. After compressing and releasing the ring 5
times, the ring shall be inspected for compliance with the requirements of 3.5.4.6.3.
4.3.2.1.1.4 Type I, Classes 5, 6, 8 and 9; and Type II, Classes 3 and 4 retaining rings. Type
I, Classes 5, 6, 8 and 9; and Type II, Classes 3 and 4 rings shall be radially assembled into a
groove or over a pin having the minimum groove diameter specified for the applicable size ring
and inspected for compliance with the requirements of 3.5.4.6.4.
4.3.2.1.1.5 Type I, Class 7 retaining rings. Type I, Class 7 rings shall be expanded over a
shaft having the maximum diameter (see Table VII) of the shaft on which the ring is intended for
use. After removal from the shaft, the ring shall be inspected for compliance with the
requirements of 3.5.4.6.5.
4.3.2.1.2 Hardness test. After the tests of 4.3.2.1.1 each sample retaining ring selected in
accordance with 4.2.3 shall be tested for conformance to the hardness requirements specified
herein for the applicable type, class, material and size of retaining ring. The surfaces of both
sides of each sample ring shall be prepared for hardness testing by removal of all plating and
other surface conditions which may affect the hardness reading. Hardness readings shall be
taken as close as practicable to the center of the widest surface of the ring.
4.3.2.1.3 Packaging, packing and marking. Samples of packaging and packing containers
selected in accordance with 4.2.2 shall be examined for compliance with the contract or order
and this specification, in accordance with the requirements of ASQ Z1.4.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-
house contractor personnel, these personnel need to contact the responsible packaging activity
to ascertain packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activities within the Military Service or Defense Agency, or within the
military service's system commands. Packaging data retrieval is available from the managing
Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but
is not mandatory.)
6.1 Intended use. Retaining rings covered by this specification are for internal and external
retaining applications, such as positioning and retaining bearings and springs in housings and on
shafts, and for retaining shafts in housings. This specification covers the procurement
requirements for Military Standards MS3215, MS3216, MS3217, MS16624 through MS16634,
MS90707 and MS90708.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number and date of this specification.
b.
Title, number and date of applicable Military standard(s) (see 3.5).
c.
Applicable MS part number (see 3.5).
d.
Copies and distribution of test certifications.
e.
Packaging requirements (see 5.1).
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