MIL-PRF-49142B
2.4 Order of precedence. In the event of a conflict between the text of this document and the
references cited herein (except for related specification sheets), the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in
accordance with the applicable specification sheets. In the event of any conflict between the
requirements of this specification and specification sheets, 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 4.4
and 6.3.)
3.3 Critical interface material. Material shall be as specified herein (see table I). 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 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.
TABLE I. Materials.
Component material
Applicable
specification
ASTM B139
Phosphor bronze
ASTM B152
Soft copper
ASTM B88
Copper
PTFE fluorocarbon
ASTM D4894 and ASTM D4895
FEP fluorocarbon
ASTM D2116
Silicon rubber
A-A-59588
3.3.1 Critical interface materials and finish. Unless otherwise specified (see 3.1), connector 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 Recycled, recovered, or environmentally preferable 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.
3.3.1.2 Center contacts. The male pin shall be plated to a minimum gold thickness of 50 micro
inches (1.27 µm) in accordance with ASTM B488, type II code C, class 1.27, over 50 micro inches (1.27
µm) 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
µm) of gold in accordance with ASTM B488, type II, code C, class 1.27, over 50 micro inches (1.27 µm) of
nickel in accordance with SAE-AMS-QQ-N-290, class 1, including the I.D., measured at a depth of .040
inch (1.01 mm) 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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