8 inch printed wiring boards, and for interconnections between printed wiring boards. The connectors are intended to provide a reliable connection between printed wiring and conventional wiring. The interconnector concept is intended to provide connection of printed wiring on one board to printed wiring on another board.

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MIL-DTL-21097G

3.3 Materials. Materials shall be as identified herein. However, when a definite material is not specified, a material

shall be used which will enable the connectors and accessories to meet the performance requirement. Acceptance or

approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product.

3.3.1 Reference materials, platings and processes. The identified reference materials, platings, and processes have

been established to provide assurances that connectors manufactured to this specification will properly interface to

similar industry standard or government specified connector systems without problems of electrochemical contamination

of critical electrical or mechanical interfaces or generation of incompatible mechanical interface surface wear products.

The manufacturers of connectors supplied to this specification are allowed to use alternate recognized industry standard

materials, platings, and processes from those specified in 3.3 of this specification. Alternate materials, platings and

processes used must be coordinated with the qualifying activity as part of the qualification process. Use of alternates to

those referenced guidance items by the supplier shall not result in inferior short or long term performance or reliability of

supplied connectors as compared with connectors manufactured using the referenced materials, platings, or processes.

Short or long term failures or reliability problems due to use of these alternates shall be the responsibility of the supplier.

3.3.2 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.

3.3.3 Nonmagnetic materials. All parts shall be made from materials which are classed as nonmagnetic (permeability

≤ 2� using indicator in accordance with ASTM A342/A342M) (see 3.3).

3.3.4 Body materials. Unless otherwise specified (see 3.1), the body material shall conform to SDG-F or GDI-30F in

accordance with ASTM D5948 (see 3.3) or type TPES013G30 in accordance with ASTM D5927 or type GPT-30F in

accordance with MIL-M-24519.

3.3.5 Dissimilar metals. Where dissimilar metals are used in intimate contact with each other, protection against

electrolysis and corrosion shall be provided. Dissimilar metals shall be defined and classified in accordance with MIL-

STD-889. Dissimilar metals such as brass, copper, or steel (except corrosion resisting steel, passivated in accordance

with 3.3.6.1) shall not be used in intimate contact with aluminum or aluminum alloy.

3.3.6 Finish. All exposed metal parts, other than electrical contacts and stainless steel parts, shall be cadmium

plated in accordance with SAE-AMS-QQ-P-416, type II, class 1 or 2, except that a preliminary plating of other metal is

permissible. Stainless steel parts shall be passivated in accordance with SAE-AMS-2700, method 1, type 2.

3.3.6.1 Corrosion-resistant steel. Where applicable, corrosion-resistant steel shall be 300 series, low magnetic

permeability in accordance with ASTM A581/A581M, ASTM A582/A582M, or ASTM A484/A484M and passivated in

accordance with SAE-AMS-2700, method 1, type 2, or to finish E300 as specified in MIL-DTL-14072 (see 3.1).

3.3.7 Contacts. Unless otherwise specified (see 3.1), contact material shall be phosphor bronze in accordance with

ASTM B139/B139M or beryllium copper in accordance with ASTM B194, ASTM B196/B196M or ASTM B197/B197M, or

copper nickel tin alloy C72900 in accordance with ASTM B740.

3.3.7.1 Contact finish. All contact finishes shall have an underplate of copper in accordance with SAE AMS2418

(100 microinches) or nickel in accordance with SAE-AMS2403 (30 to 150 microinches). A gold plating in accordance

with ASTM B488, type I is permissible under type II gold. Silver underplate shall not be used. Either an overall finish

(3.3.7.1.1) or a localized finish (3.3.7.1.2) is permitted.

NOTE: When contacts have been provided in strip form, the absence of plating in the area where the contact was

removed from the strip is acceptable provided it is in a nonfunctional area and any corrosion formed as a result of salt

spray testing does not creep into contact mating area.