MIL-DTL-55302/139C
Requirements:
Dimensions and configuration: See figure 1.
Material: Guide pins, type X guide sockets, jackscrews and jack sockets shall be made of corrosion resisting
stainless steel in accordance with ASTM A581 or ASTM A582 passivated in accordance with SAE-AMS-QQ-P-35 or
shall be corrosion resistant copper nickel alloy (61 ±2% nickel, 2.5% max. other, and the balance zinc) and shall
have a brinell hardness of 145 to 175. Type Y guide sockets shall be beryllium copper in accordance with
ASTM B196 or ASTM B197, nickel plated in accordance with SAE-AMS-QQ-N-290, class 2, 50 to 150 microinches.
Plating: The contact plating shall be in accordance with MIL-DTL-55302 or gold in accordance with ASTM B 488
type II, code C, class 1.27, over nickel plating in accordance with SAE-AMS-QQ-N-290, class 2, 50 to 150
microinches in the engaging area and gold in accordance with ASTM B 488 type II, grade C, class 0.51 type III,
code A, class 0.51, over nickel plating in accordance with SAE-AMS-QQ-N-290, 50 to 150 microinches.
Nonfunctional areas: See MIL-DTL-55302.
Contact identification: See figure 1.
Contact engagement and separation forces (number 22 contacts):
Minimum separation: 0.5 ounce.
Maximum engagement: 12.0 ounces for standard force and 4.0 ounces for low force.
Mating and unmating:
Standard insertion force contacts: The maximum mating force, in pounds, shall be the number of contacts
multiplied by 0.56 and the withdrawal force, in pounds, shall be a minimum of 0.08 times the number of contacts
and shall not exceed the measured insertion force.
Low insertion force contacts: The maximum mating force, in pounds, shall be the number of contacts multiplied by
0.25 and the withdrawal force, in pounds, shall be a minimum of 0.04 times the number of contacts and shall not
exceed the maximum insertion force.
NOTE: Not applicable when mating and unmating is accomplished through the engaging of turning jacksets.
Jackscrew and jack socket torque: 2-inch pounds maximum, fully mated.
Current rating: 5.0 amperes maximum in accordance with contact.
Contact resistance: The average contact resistance of all contacts measured shall not exceed 0.010 ohm, and no
individual contact pair shall have a resistance exceeding 0.020 ohm.
Dielectric withstanding voltage:
Sea level: 1,000 volts rms.
High altitude: 300 volts rms.
Polarization: Type X, regular, guide pin and socket, full round (see figure 1). Type Y, adjustable "D" shaped guide pin
and/or socket (see detail D and MIL-DTL-55302/57, detail B). All connectors are supplied in the -1 polarized position.
For other than OEM use, connectors may be repolarized by using M55302/57-01 spanner wrench and M55302/57-02
guide pin and guide socket kit. When guides are removed and reinstalled in another position apply Loctite 83-CV or
equivalent to the threads. Ordering connectors in other than the -1 polarized position may be done by the OEM's by
placing the desired polarized in brackets three spaces after the Part or Identifying Number (PIN), on the purchase
order. Example M55302/139-A100Y [-32]. Polarization pins and sockets shall be adjusted to any desired
configuration by spanner wrench (M55302/57-01). Ordering connectors in the -1 polarized position without Loctite 83-
CV or equivalent applied may be done by placing a "-0" in brackets three spaces after the part on the purchase order.
M55302/57-02 kit: Consists of one type "D" shaped guide socket and spanner nut and one type Y "D" shaped guide
pin and spanner nut.
NOTE: Hardware with Loctite 83-CV or equivalent applied, shall withstand a torque of 7-inch ounces applied through
the nut.
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