MIL-PRF-55339C
3.3 Critical interface material. Material shall be specified herein and in table I. If materials other
than those specified are used, the contractor shall certify to the qualifying activity that the substitute
material enables the adapters to meet the requirements of this specification. Acceptance or approval
of any constituent material shall not be construed as a guaranty of the acceptance of the product.
When a definite material is not specified, a material shall be used which will enable the adapters to
meet the requirements of this specification. Any substitute materials shall be non-hazardous and
permit the adapter to meet the requirements of section 3 of this specification.
TABLE I. Materials.
Component material
Applicable specification
Steel
Brass
Copper beryllium
Phosphor bronze
Soft copper
Copper
PTFE fluorocarbon
FEP fluorocarbon
Silicon rubber
3.3.1 Critical interface materials and finish. Unless otherwise specified (see 3.1), adapter center
contacts and bodies shall be plated in the following manner in order to meet the requirements of this
specification and avoid detrimental interactions between dissimilar metals.
3.3.1.1 Center contacts. The male pin shall be plated to a minimum gold thickness of 50 micro
inches (1.27 micro meters) in accordance with ASTM B488, type II code C, class 1.27, over 50 micro
inches (1.27 micro meters) minimum of nickel in accordance with SAE-AMS-QQ-N-290, class 1,
measured anywhere along the mating surface, for all series. The socket contact shall be plated to a
minimum of 50 micro inches (1.27 micro meters) of gold in accordance with ASTM B488, type II, code
C, class 1.27, over 50 micro inches minimum of nickel in accordance with SAE-AMS-QQ-N-290, class
1, including the I.D., measured at a depth of .040 inch (1.01mm) minimum. The plating on non-
significant surfaces in the I.D. shall be of sufficient thickness to ensure plating continuity and uniform
utility and protection. This plating may consist of an underplate only. A silver underplate shall not be
permitted on any contact, pin or socket.
3.3.1.2 Adapter bodies. All brass bodied adapters shall be silver plated in accordance with ASTM
B700 to a minimum thickness of 0.000200 inch (0.005 mm) over a copper underplate, or nickel
plated in accordance with SAE-AMS-QQ-N-290, 0.000200 inch (0.005mm), minimum. All copper
beryllium bodied adapters shall be gold plated to a minimum thickness of 50 micro inches (1.27 µm)
in accordance with ASTM B488, type II, code C, class 1.27 over a copper flash. All corrosion
resistant steel bodied adapters shall be passivated in accordance with SAE-AMS2700, unless
otherwise specified (see 3.1). NOTE: Ferrous or nickel alloys shall not be used on brass or copper
beryllium bodied adapters (i.e., coupling nut, etc.).
3.3.2 Dissimilar metals. Dissimilar metals between which an electromotive couple may exist shall
not be placed in contact with each other. Reference is made to MIL-STD-889 for definition of
dissimilar metals.
3.3.3 Nonmagnetic materials. All parts (except hermetic sealed adapters and connector hardware)
shall be made from materials which are classed nonmagnetic (see 3.9).
4
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business