MIL-DTL-26518C
NATIONAL CONFERENCE OF STANDARDS LABORATORIES (NCSL)
NCSL Z540-1
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Calibration Laboratories and Measuring and Test Equipment, General Requirements.
(Application for copies should be addressed to the National Conference of Standards Laboratories, 1800 30th St. Boulder CO.
80301)
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 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 Materials. Example reference materials are identified herein. However, when an example reference material is not identified, a
material shall be used which will enable the connectors, sockets and accessories to meet the performance requirements of this
specification. Acceptance or approval of a constituent material shall not be construed as a guaranty of acceptance of the finished
product.
3.3.1 Reference critical interface, materials, plating, and processes. The identified reference critical interface materials, plating,
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 manufacturer of
connectors supplied to this specification are allowed to use alternate recognized industry standard materials, plating, and processes
from those identified in 3.3 of this specification. Alternate materials, plating 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 must not
result in inferior short or long term performance or reliability of supplied connectors as compared with connectors manufactured using
the referenced materials, plating, 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 material. 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 Dissimilar metals. When dissimilar metals are employed in intimate contact with each other, protection against electrolytic
corrosion shall be provided, for guidance information reference MIL-STD-889.
3.3.4 Nonmagnetic materials. Unless other wise exempted by this specification, all component parts of class R shall be made from
materials which are classified as nonmagnetic (see 3.6.2).
3.3.5 Shells. The shells for class R shall be forced of aluminum alloy 6061 temper T6, in accordance with QQ-A-367. Other
materials are permitted provided they meet the performance requirements of this specification and, in their finished form, occupy the
same position in the galvanic series as the aluminum shell. Any other parts shall be of high-grade aluminum alloy die casting
conforming to ASTM B85 or aluminum forging alloy conforming to QQ-A-367.
3.3.6 Finish. Aluminum parts shall be anodized in accordance with MIL-A-8625 or suitable hard anodizing process to meet the
requirements herein. All other metal parts shall be made of corrosion-resistant material or be protected to meet the performance
requirements of this specification. The finish of class H shells shall be suitable for soldering or brazing to the mounting surface.
3.4 Design and construction. The connector shall be so designed and constructed that it can withstand service usage.
3.5 Critical interface requirements.
3.5.1 Configuration. The connectors shall conform to the applicable military standards.
3.5.2 Contacts.
3.5.2.1 Contact requirements. The class R connectors shall be designed to meet the performance requirements of this
specification using contacts qualified under MIL-C-39029/31 and MIL-C-39029/32. Class H connectors may have contacts of ferrous
alloy, rhodium plated in accordance with MIL-C-39029. Coaxial contacts shall conform to MIL-C-39029/54 and MIL-C-39029/55.
3.5.2.2 Insertion and removal. The class R connector design shall permit individual insertion and removal of the contacts without
removing the insert or sealing members. Insertion of the contacts into and removal of the contacts from the insert shall be
accomplished with the aid of tools as shown on MIL-L-81969/17 or /19.
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