MIL-DTL-55302/54C
REQUIREMENTS:
Dimensions and configuration: See figure 1 and table I.
Material and finish:
Contact: .020 inch thick phosphor bronze in accordance with ASTM B139, UNS C51000. Gold plate in
accordance with ASTM B488, type II, grade D class 1.27, over nickel plating in accordance with
SAE-AMS-QQ-N-290, class 2, 30 to 150 microinches in the engagement area for a length of .120 inch minimum
(see figure 1). The remainder of contact shall be tin lead .0001 microinch minimum in accordance with
SAE-AMS-P-81728 over nickel plating in accordance with SAE-AMS-QQ-P-290, class 2, 30 to 150 microinches.
Insulator: ASTM D5948, type SDG-F.
End guides: Left hand, sintered brass 90/10, clear chromate in accordance with MIL-C-5541, class 1A (gold
color). Right hand, sintered brass 90/10, nickel plate 300 microinches in accordance with MIL-F-14072 (silver
color).
Polarizing pin: Aluminum alloy 2011-T3 with clear chromate, in accordance with MIL-C-5541, class 1A.
Mounting screw: Brass, cadmium plated, gold chromate finish.
Flat washer: Stainless steel.
Contact identification: Numerical sequence starting with the closest contact adjacent to the left hand end guide
(gold color) shall be contact number 1; contact number 2 would be the next offset contact, etc.
Mating and unmating: The maximum insertion force, in pounds, shall not exceed a value equal to .5 times the
number of contacts, and the withdrawal force, in pounds, shall be a minimum of .11 times the number of contacts
and shall not exceed the measured insertion force.
Individual contact separation force:
Unplated contacts: One-ounce minimum when tested in production with gage shown on MIL-DTL-55302/97.
Plated contacts: One-ounce minimum.
Contact resistance: The average contact resistance of all pairs measured shall not exceed 20 miiliohms.
Low level circuit: The low-level circuit resistance shall not exceed 20 milliohms.
Dielectric withstanding voltage:
Sea level: 1,000 volts rms, 60 cycle, ac.
High altitude (70,000 feet): 300 volts rms, 60 cycles ac.
Current rating, maximum: 5 amperes.
Polarizing pin: When required, one of the following codes shall be added to the dash number:
"P": specifying location by contact number where polarizing pin shall be inserted; for example, M55302/54-
01P17 (polarizing pin inserted in place of contact number 17).
"H": specifying location by contact number where contact shall be omitted for mating; for example, M55302/54-
01H17(polarizing hole has contact number 17 omitted).
Mating plug: Shall conform to MIL-DTL-55302/52, /99.
PIN: M55302/54- (dash number from table I).
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