MIL-DTL-83502E
3.2 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in
accordance with 4.2.
3.3 Materials. Materials shall be as identified herein or as approved by the qualifying activity. However,
when a definite material is not specified, a material shall be used which will enable the sockets and
accessories to meet the requirements of this specification. Acceptance or approval of any constituent
material shall not be construed as a guarantee of acceptance of the finished product.
3.3.1 Reference materials, plating, and processes. The materials, plating and processes identified in
this specification assure that sockets will properly interface to similar industry standard and government
specified connector systems, without problems such as electrochemical contamination or deterioration,
electrolytic corrosion, or excessive surface wear. Manufacturers may be allowed minor variations from
these exact requirements upon written request to, and subsequent written approval from DSCC-VAI.
Significant variations from this specification, especially those which could affect short or long term
reliability or performance, must undergo the normal coordination and approval process. Any short or long
term failures or reliability problems due to such deviation shall be the responsibility of the supplier.3.3.1
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 cost.
3.3.1.2 Pure tin. The use of pure tin is prohibited (see 6.4). The maximum amount of pure tin is 97
percent and the alloy material shall inhibit the growth of tin whiskers.
3.3.2 Body. The socket insulator body (and removable insulator, when applicable), shall be
manufactured with polytetrafluoroethylene in accordance with ASTM D1710, type I, grade 1, class D or
diallyl phthalate in accordance with ASTM D5948, type SDG-F, glass filled polyamide (nylon) in
accordance with ASTM D4066 type PA110 and as specified (see 3.1).
3.3.3 Socket spring contact and socket sleeve. The socket spring contact member shall be beryllium
copper in accordance ASTM B139/B139M, ASTM B194, or ASTM B196/B196M. The socket sleeve shall
be brass in accordance with ASTM B16/B16M.
3.3.4 Contact finish. The contact finish shall be gold applied overall or localized. When contacts are
provided in strip form, the absence of plating in the area where the contact was removed from the strip is
acceptable, provided it is a non-functional area and any corrosion formed as a result of salt spray testing
does not creep into the contact engaging area.
3.3.4.1 Overall finish. Contacts shall be gold plated in accordance with ASTM B488, type I, code C,
class 0.76 (30 microinches) minimum over a nickel underplate in accordance with SAE-AMS-QQ-N-290,
class 2, 30 microinches (0.76 μm) to 150 microinches (3.81 μm) thick. Silver shall not be used as an
underplate (see 3.3.1).
3.3.4.2 Localized finish. Socket contacts shall be overall nickel plated in accordance with
SAE-AMS-QQ-N-290, class 2, 30 microinches (0.76 μm) to 150 microinches (3.81 μm) thick. Localized
gold plating applied over the nickel by means of selective plating, inlay, welded dot, or other similar
localization systems is permitted in lieu of overall plating, provided the conditions specified herein are met.
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