MIL-DTL-55302/138C
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 A582 passivated in accordance with SAE-AMS-QQ-P-35 or shall be
corrosion resistant copper nickel alloy (61 ±2% nickel, 2.5% maximum 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, 30 to 150 microinches.
Plating: The contact plating shall be in accordance with MIL-DTL-55302 or gold in accordance with ASTM B488
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 B488 type II, code C, class 0.51 or type III
code A, class 0.51, over nickel plating in accordance with SAE-AMS-QQ-N-290, class 2, 50 to 150 microinches.
Nonfunctional areas: See MIL-DTL-55302.
Contact identification: See figure 1.
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 A and MIL-DTL-55302/57, detail B). All connectors are supplied in the -1 polarized position.
For other than Original Equipment Manufacturer (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 M55302/138-A160Y [-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 Y "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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