MIL-DTL-55302/121B
REQUIREMENTS:
Design and construction:
Dimensions and configuration: See figure 1. This specification sheet describes the daughterboard
or socket side of a metal shell two-piece edgeboard connector system. This system uses reverse
gender contacts; i.e., the live pin is recessed in the insulator with the static socket protruding from a
shrouded interface.
Material and finish:
Pin contact: Copper alloy. Gold plate in accordance with ASTM B488, type II, code C, class 1.27.
A suitable copper or gold underplate is permissible for adhesion.
Insulator: Diallyl phthalate in accordance with ASTM D5948.
Pin shell: Aluminum alloy electroless nickel per SAE-AMS-C-26074.
Keys: In accordance with MIL-DTL-55302/124.
Contact identification: Contact rows and end contact number are marked on the side of the receptacle.
See figure 1 for further details.
Contact retention: The contact retention shall exceed 5 pounds. The test shall be conducted by pulling
axially on the wire.
Oversize pin exclusion test: Not applicable to reverse gender connectors.
Mating and unmating: The maximum mating force, in pounds, shall not exceed a value equal to .6
times the number of contacts, and the mating force, in pounds, shall be a minimum of .03 times the
number of contacts and shall not exceed the measured insertion force.
Individual contact engaging and separation force: 8.0 ounces maximum engaging, 0.5 ounce minimum
separation. Contact resistance not to exceed 36 millivolts at 3 amps rated current.
Low level circuit: The low level circuit resistance shall not exceed 20 milliohms.
Dielectric withstanding voltage:
Sea level: 800 volts rms, 60 hertz.
High altitude (70,000 feet): 200 volts rms, 60 hertz.
Current rating, maximum: 3 amperes per contact.
Conformance inspection: In accordance with MIL-DTL-55302, except under group "A" inspection; add
tests for dielectric withstanding voltage and insulation resistance. Under group "B" inspection delete
the test for insulation resistance; add tests for contact separation and mating and unmating.
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