MIL-PRF-31031B
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Beryllium copper body, gold finish. All copper beryllium bodied connectors are to be gold
plated in accordance with ASTM B488, type II, code C, class 1.27, over a copper flash. The
male pin shall be plated to a minimum gold thickness of 1.27µm (50 micro inches) in
accordance with ASTM B488, type II, code C, class 1.27, over 1.27µm (50 micro inches)
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 1.27µm
(50 micro inches) of gold in accordance with ASTM B488, type II, code C, class 1.27, over
1.27µm (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 1.02mm (.040 inch) 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.
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CRES body, gold plated in accordance with ASTM B488, type II, code C, class 1.27. Coupling
nuts are to be passivated in accordance with SAE-AMS-2700, type 2. The male pin shall be
plated to a minimum gold thickness of 1.27µm (50 micro inches) in accordance with ASTM
B488, type II, code C, class 1.27, over 1.27µm (50 micro inches) 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 1.27µm (50 micro inches) of
gold in accordance with ASTM B488, type II, code C, class 1.27, over 1.27µm (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 1.02mm (.040 inch) 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.
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Brass body, silver finish. All brass-bodied connectors are silver plated to a minimum thickness
of 5.08 µm (.0002 inch) in accordance with ASTM B700, over a copper underplate. Center
contact finish shall be gold plated to a minimum thickness of 2.54 µm (.0001 inch) type II, code
C over a 2.54 µm (.0001 inch) copper plate, class 4 in accordance with ASTM B488.
Corrosion-resistant steel body, passivated finish in accordance with SAE-AMS-2700, type 2.
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Center contact finish shall be gold plated to a minimum thickness of 2.54 µm (.0001 inch) type
II, code C over a 2.54 µm (.0001 inch) copper plate, class 4 in accordance with ASTM B488.
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Beryllium copper body, gold finish. All copper beryllium bodied connectors are to be gold
plated in accordance with ASTM B488, type II, code C, class 1.27, over a copper flash. Center
contact finish shall be gold plated to a minimum thickness of 2.54 µm (.0001 inch) type II, code
C over a 2.54 µm (.0001 inch) copper plate, class 4, in accordance with ASTM B488.
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CRES body, gold plated type in accordance with ASTM B488, type II, code C, class 1.27.
Coupling nuts are to be passivated in accordance with SAE-AMS-2700, type 2. Center contact
finish shall be gold plated to a minimum thickness of 2.54 µm (.0001 inch) type II, code C over
a 2.54 µm (.0001 inch) copper plate, class 4, in accordance with ASTM B488.
3.3.1.1 Recycled recovered or environmentally preferably materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
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