MIL-PRF-31031B
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in
accordance with the applicable specification sheet. In the event of any conflict between the requirements
of this specification and the specification sheet, the latter shall govern.
3.2 Qualification. Connectors furnished under this specification shall be products that are authorized
by the qualifying activity for listing on the applicable qualified products list before contract award (see
3.2.1 QPL system. The manufacturer shall establish and maintain a QPL system for parts covered by
this specification. Requirements for this system are specified in MIL-STD-790. In addition, the
manufacturer shall establish a Statistical Process Control (SPC) system that meets the requirements of
3.2.2.
3.2.2 SPC system. As part of the overall MIL-STD-790 QPL system, the manufacturer shall establish a
SPC system that meets the requirements of EIA-557.
3.3 Critical interface, materials plating and processes. Material shall be as specified herein. If
materials other than those specified are used, the contractor shall certify to the qualifying activity that the
substitute material enables the connectors 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
finished product. When a definite material is not specified, a material shall be used which will enable the
connector to meet the requirements of this specification.
3.3.1 Critical interface connector body material/finish and center contact finish. The connector body
material/finish and center contact finish shall be one of the following:
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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. 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 1.02 mm (.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.
Corrosion-resistant steel body, passivated finish in accordance with SAE-AMS-2700, type 2.
3-
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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