MIL-DTL-83526C
3.4.3.2 Interoperability. All connectors of the same PIN shall be interoperable. Upon qualification of
the first manufacturer, all subsequent manufacturers shall provide proof of interoperability with each
qualified manufacturer as specified in Appendix A. The connectors shall meet the requirements of
insertion loss (see 3.10.1), terminus insertion and removal forces (see 3.11.9), and terminus retention
3.4.4 Nontoxic and nonhazardous. The connectors shall not release toxic or explosive fumes
exceeding the limits specified when exposed to flame or chemical agents commonly used in the
environment in which the connectors are intended for use.
3.4.5 Cleaning. The design of the connector shall permit cleaning of the optical face of the terminus
without requiring major disassembly of the connector or removal of the terminus from the connector. The
connector shall not be softened, embrittled, etched, or otherwise affected by the optical cleaning agent.
Attention shall be given to the criteria for inspection and test of the connector to determine if the cleaning
procedure has been successful.
3.4.6 Scoop proof. The optical mating faces must be suitably protected to prevent degradation of the
specified light transfer characteristics as a result of repeated mechanical matings and unmatings. Neither
the shell assemblies nor the connector dust cover shall make contact with the optical faces during the
mating or unmating of the connector.
3.4.7 Mating characteristics. The connectors specified herein shall satisfy the following operational and
human factor requirement.
3.4.7.1 Blind mating. The connector designs shall allow mating and unmating in "blind" conditions
where the operator cannot fully observe the connector during the mating process.
3.5 Connectors.
3.5.1 Shell. The connector shell or backshells shall retain the connector insert.
3.5.2 Engagement of connectors. Unless otherwise specified (see 3.1), the connector shall be capable
of being mated and unmated without the use of special tools.
3.5.3 Coupling mechanism. Coupling rings of the connectors shall be knurled or fluted to facilitate
hand tightening, and designed so that the mating halves optical termini shall approach or recede from
each other as the coupling mechanism is respectively tightened by clockwise rotation or loosened in the
counter-clockwise direction as viewed from rear of plug connector. No strap wrenches or other tools shall
be required to torque the connectors to accomplish mate up. The coupling mechanism shall be captive
on the plug to mate with the receptacle shell. Coupling ring and coupling screw threads shall be in
accordance with FED-STD-H28, and as specified (see 3.1). If the coupling threads must be lubricated to
meet the requirements contained herein, the lubricant shall be applied only during manufacture. The
lubricant selected shall not be reapplied nor migrate into the optical junctions region during use.
3.5.4 Polarization. Polarization of the mating halves shall be provided and designed to prevent
physical contact of the mating optical termini or of the termini with the insert surface of the counterpart
connector until properly aligned for engagement. Backshell splines, keys, and keyways shall be polarized
and mated prior to coupling (see 3.1).
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