MIL-PRF-28876E
3.5.1.3 Engagement of connectors. Counterpart connectors of any
arrangement and accessories shall be capable of being fully engaged and
disengaged without the use of tools.
3.5.1.4 Coupling mechanism. Coupling rings of the connectors shall be
knurled, and designed so that plug and receptacle optical termini shall
approach or recede from each other as the coupling mechanism is respectively
tightened by clockwise rotation or loosened in the counterclockwise direction
as viewed from the rear of the plug connector. 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 MIL-STD-1373 and as shown
on figures A-4 and A-5, and as specified (see 3.1). If the coupling threads
must be lubricated to meet the requirements contained herein, the lubricant
shall meet all of the requirements specified herein (see 3.3.9).
3.5.1.5 Plug and receptacle shell polarization (keying). Polarization
keying shall be incorporated in the shells of plugs and receptacles to assure
correct alignment of the inserts before mating is permitted. The polarization
shall be accomplished by integral keys (see figure A-3) in the shells. The
keying shall be designed to prevent physical contact of the mating optical
termini, or of the termini with the insert surface of the counterpart
connector until the keyways are properly aligned for engagement and coupling
mechanisms are engaged.
3.5.2 Termini. Removable, environment resisting fiber optic termini shall
be used with these connectors for interconnecting fiber optic cables. The
termini are not supplied with connectors acquired to this specification.
Termini, for use with the connectors specified herein, shall be in accordance
with MIL-PRF-29504 (see 3.1).
3.5.3 Inserts. Inserts shall be keyed and secured to prevent rotation
within the connector shell. Inserts shall be of a one piece or two piece
construction and shall be such that they will not crack, chip, or break in
normal service or assembly. Inserts glued or bonded together shall not be
used. The insert dimensions shall be as specified (see 3.1). The insert hole
configuration shall conform to the dimensions shown on figure 1.
3.5.3.1 Number of termini, arrangement, and spacing. The insert pattern,
that is, the number of termini, their arrangement and spacing shall be as
specified in Appendix B. Every terminus position shall accept either optical
or dummy termini.
3.5.3.2 Terminus insertion and removal methods. Optical terminus insertion
shall be accomplished by inserting the terminus, using a terminus insertion
tool, into the rear of the connector insert. A means for locking the terminus
in place shall be provided. Optical terminus removal shall be accomplished by
inserting the terminus removal tool into the front of the connector and by
forcing the terminus out the rear of the connector. The individual termini
shall be positively retained in the connector when installed with the terminus
insertion tool and shall be capable of being removed without terminus or
insert damage when using the terminus removal tool. Requirements for these
tools shall be as specified (see 3.1).
3.5.4 Assembly methods. Connector assembly shall be accomplished in
accordance with MIL-STD-2042.
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