MIL-DTL-55302/173C
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, .170 inch minimum length, shall be gold
over nickel in accordance with MIL-DTL-55302. Compliant pin area (contact type 1, .748 inch
minimum length, type II, .548 minimum length; type IV, .265 inch minimum length) shall be tin-
lead over nickel in accordance with MIL-DTL-55302. Solder post area contact type VI, .205
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1/ Type C finish is deleted and superseded by type A or B.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 figure 1 and table I.
Materials: 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.
Jackscrews (see MIL-DTL-55302/182):
Use M55302/182-11, -12, -13, -14, -15, or 16. Jackscrews are purchased 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: M55302/173 (and dash number from table I and type from table II).
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