MIL-DTL-28840/13F
Marking: The cover shall be identified with the manufacturer's name or trademark and the Part or
Identifying Number (PIN).
PIN example:
M28840/
13
H
A
W
Military designator
Specification sheet number
Shell size designator
Chain attachment designator
A Link chain with fastener
B Link chain with ring for jam-nut mounting receptacle
C Link chain with ring for cable-connecting receptacle
Material and finish designator
(See table I)
QUALIFICATION: One protective cover of each shell size for which qualification is desired shall have the
following tests performed in the sequence shown:
Visual and mechanical.
Magnetic permeability.
Shell conductivity.
Corrosion.
Air leakage: Cover shall be mated to suitable connector plug and tested in accordance with test
procedure EIA-364-02. The following details shall apply: The air leakage rate shall not be greater
than one atmospheric cubic inch per hour (4.55 X 10-3 cubic centimeter per second).
Tensile strength: Cover shall be mounted to a suitable fixture to facilitate a 25-pound pull applied at
the rate of 5 pounds per second and held for a period of 5 seconds. The load shall be applied to
the chain end fastener through the center line axis of the protective cover, and then repeated
through a perpendicular axis (90°) from the center line axis. Chain or fastener breakage, or
loosening of the rivet, shall be considered failures.
Shell conductivity.
Post visual and mechanical.
RESTRICTIONS:
Material and finish designators W and D are inactive for NAVSEA new design, unless approved by
NAVSEA.
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