MIL-DTL-27599D
3.4.3.1 Spring fingers. Spring fingers shall be designed to make electrical contact with the mating shell
without interfering with proper engagement. The springs shall be retained about the shell periphery.
Minimum engagement of the spring fingers shall be 0.040 inch prior to contact engagement for series I
and shall engage the mating shell at 0.040 inch after contact engagement for series II.
3.4.3.2 Jam-nut mounting receptacles. Jam-nut mounting receptacles shall be provided with a
mounting nut, MS3186 for series I, MS27512 for series II, all with provisions for locking, and an "O" ring
SAE-AS3578.
3.4.4 Screw threads. Screw threads shall conform to FED-STD-H28 and MIL-S-7742. Threads
shall be checked using ring or plug gauges. Slight out-of-roundness beyond the specified tolerances of
H28 is acceptable if threads can accept the gauges without forcing.
3.4.5 Coupling. Connectors shall be coupled to counterpart connectors by means of a bayonet
mechanism. The mechanism shall include a means of maintaining the mated connector in full
engagement. The coupling ring shall be knurled or fluted to facilitate coupling and shall be captivated.
Coupling pins shall be riveted, welded, or brazed in place and have their end surfaces a contrasting color.
3.4.5.1 Ease of coupling. Counterpart connectors of any arrangement shall be capable of being fully
coupled and uncoupled in a normal and accessible location without the use of tools.
3.4.5.2 Locking. A detent shall be provided in the coupling mechanism so that an audible click is
evident when proper coupling is accomplished. Provision shall be made for visual determination that
proper coupling has been achieved.
3.4.5.3 Polarization of connector shells. Polarization of connector shells shall be accomplished by
means of five integral keys and suitable matching keyways on the counterpart. Polarization shall be
accomplished before initial engagement of the coupling ring. During axial engagement, pins shall not
touch sockets or the insert face until polarization has been achieved.
3.4.5.3.1 Alternates. Shells shall also be supplied with the main key (or keyway) rotated from the
normal as specified on figure 7.
3.4.5.4 Lubrication. Bayonet coupling ramps and spring washers shall be coated with a suitable
lubricant. Rear threads shall not be lubricated.
3.4.5.5 Pin-to-pin mating prevention (series I). Connectors shall be designed such that pin-to-pin
contacts (electrical or physical) is not possible in the event that a plug with pin contacts is inadvertently
mated to a receptacle with pin contacts.
3.4.6 Cavity fill. The cavity at the rear of connectors between the insert and the shell shall be filled
with RTV silicone in accordance with MIL-A-46146 or equivalent.
3.4.7 Plating.
3.4.7.1 Contacts. Contacts shall be gold plated 0.00005 inch minimum in accordance with
ASTM-B488 over a suitable underplate. Silver underplate shall not be used.
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