MIL-DTL-55302/157B
REQUIREMENTS
Design and construction:
Dimensions and configurations: See figure 1.
Material and finish:
Contact plating: Wrappost contacts shall be gold plated in accordance with ASTM B488, class 1.27,
over nickel in accordance with SAE-AMS-QQ-N-290. Thickness of nickel plating shall be a
minimum of 30 microinches. Printed circuit contacts in the engagement area for .200 inch
minimum length from the top of the contact shall be gold plated in accordance with ASTM B488,
type II, code C or D, class 1.27, over nickel plating in accordance with SAE-AMS-QQ-N-290, 30 to
150 microinches. The plating on the remainder of the printed circuit contact shall be tin-lead in
accordance with SAE-AMS-P-81728, type I, 100 microinches minimum over nickel plating in
accordance with SAE-AMS-QQ-N-290, 30 to 150 microinches.
Contact identification: See figure 1.
Mating and unmating: The maximum mating force, in pounds, shall not exceed a value equal to .25
times the number of contacts, and the withdrawal force, in pounds, shall be a minimum of .025 times
the number of contacts and shall not exceed the measured insertion force, when the housing is loaded
with contacts and mated with connector in accordance with MIL-DTL-55302/158.
Contact rating: 3.0 amperes maximum per contact.
Contact resistance: No individual contact pair shall have a resistance exceeding .020 ohm.
Contact retention: 3 pounds minimum per contact.
Dielectric withstanding voltage:
Oversize pin exclusion: Not applicable.
Sea level: 1,000 volts rms, 50 or 60 hertz.
High altitude: 300 volts rms, 50 or 60 hertz.
Part or Identifying Number (PIN): M55302/157- (dash number from figure 1).
Changes from previous issue. Marginal notations are not used in this revision to identify changes with
respect to the previous issue due to the extent of the changes.
Referenced documents. In addition to MIL-DTL-55302, this document references the following documents:
MIL-DTL-55302/158
ASTM B488
SAE-AMS-QQ-N-290
SAE-AMS-P-81728
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