MIL-DTL-55302/178C
TABLE II. Contact plating requirements. 1/
Type
Finish requirement
A
Overall contact finish: Shall be gold in accordance with MIL-DTL-55302.
B
Localized contact finish: Contact engagement area shall have a minimum plating in
accordance with MIL-DTL-55302. Solder post area (contact type I; .195 minimum length; type
IV; .135 minimum length) shall be tin-lead over nickel in accordance with
MIL-DTL-55302.
1/ Type C finish is deleted and superseded by type A or B.
REQUIREMENTS:
Design and construction:
Dimensions and configurations: See figures 1, 2, 3, 4 and table I.
Material: Shall be in accordance with MIL-DTL-55302.
Plating: See table II.
Current rating: 3.0 amperes maximum per contact, 2.25 amperes continuous per contact at room ambient with
no more than two adjacent contacts carrying this current.
Keying (see MIL-DTL-55302/31):
Two keys, Part or Identifying Number (PIN) M55302/31-04, and two .086-56 UNC-2A mounting screws are
recommended. Keys and screws shall be ordered separately.
Mating and unmating: The mating force in pounds shall be the number of contacts multiplied by .250; the
withdrawal force in pounds shall be a minimum of .025 times the number of contacts and shall not exceed the
measured insertion force.
Contact resistance: No individual contact pair shall have a resistance exceeding .015-ohm initial and .020 after
testing.
Contact retention: 3 pounds, minimum.
Dielectric withstanding voltage:
Sea level: 900 volts rms.
70,000 feet: 200 volts rms.
2 milliamperes maximum leakage current.
PIN: M55302/178 (and dash number from table I and type from table II).
Group qualification: See table III.
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