MIL-DTL-12883/55A
Mounting hardware: The mounting hardware shall allow mounting the socket above, or below the
panel or chassis (see figure 2), and shall allow mounting and securing the relay to the socket without
disturbing the mounted socket or access to the wiring side of the socket. The hardware shall provide
the nominal spacing between socket surface and relay mounting flange, regardless or mounting
configuration.
Supplied with relay socket:
2 each per mounting stud:
.112-40 self locking nuts (.206 max dia x .176 max height).
.112 flat washers (.220 max O.D. x .018 max thick).
1 each per mounting stud:
.190-32 self locking nuts (.330 max dia x .190 max height).
.190 flat washers (.360 max O.D. x .019 max thick).
Fixed mounting studs: Studs shall be fixed into the mounting flange of the socket and shall be
designed so as to prevent rotation of the stud within the flange (see figure 2).
Insertion and withdrawal forces: The insertion and withdrawal forces of the relay and socket shall be
as specified as in table II.
TABLE II. Insertion and withdrawal forces.
M12883/55
Condition
Test
-01, -02
-03
Initial
Insertion force (max)
15 lbf (66.72 N)
17.5 lbf (77.84 N)
Withdrawal force (min)
1.0 lbf (4.45 N)
1.1 lbf (4.45 N)
After 10 insertions
Insertion force (max)
15 lbf (66.72 N)
17.5 lbf (77.84 N)
and withdrawals,
Withdrawal force (min)
1.0 lbf (4.45 N)
1.1 lbf (4.45 N)
before vibration
After vibration
Insertion force (max)
14 lbf (62.27 N)
16.25 lbf (72.28 N)
Withdrawal force (min)
.75 lbf (3.34 N)
.82 lbf (3.65 N)
Contact installation tools: See table III.
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