MIL-DTL-3950J
3.5.4 Mounting bushing. The mounting bushing shall be as specified (see 3.1). The bushing shall be
provided with a seal between the toggle lever and the switching mechanism. The body of the elastomer
seal shall not protrude from the top of the mounting bushing with the exception of the tapered joint or
meniscus where the seal joins the toggle lever, which may be permitted to exceed the height of the
mounting bushing slightly.
3.5.5 Hardware. For direct Government acquistion, all hardware (see 3.1), mounting, and terminal,
shall be supplied in a separate package and packaged with the switch. QPL sources may provide
switches to sources, other than the Government, without hardware and may mark these switches with the
appropriate MS or M part number. Crimp pin contacts, for switches with integrated wire termination, are
not supplied with the switch.
3.5.5.1 Mounting hardware. The mounting hardware shall be as specified (see 3.1).
3.5.5.2 Terminal hardware. The terminal hardware shall be as specified (see 3.1).
3.5.6 Anti-rotational means. All switches shall be designed to have an anti-rotational mounting means
which shall be as specified (see 3.1).
3.5.7 Screw threads. Screw threads on external threaded parts shall be in accordance with
FED-STD-H28. Threading of nonmetallic parts shall not be permitted. Terminal thread engagement shall
be at least two full threads.
3.5.8 Solder. Where solder is employed, flux shall be in accordance with J-STD-004. Solder shall not
be used to obtain mechanical strength.
3.5.9 Weight. Weight shall be as specified (see 3.1).
3.6 Performance.
3.6.1 Solderability (applicable to solderable terminals). When switches are tested as specified in 4.8.2,
the criteria for acceptable solderability shall be in accordance with ANSI/J-STD-002.
3.6.2 Resistance to soldering heat (applicable to solderable terminals). When switches are tested as
specified in 4.8.3, the switches shall remain operable. When opened, there shall be no internal
deformation or damage.
3.6.3 Switching characteristics. When tested as specified in 4.8.4, switches shall operate as specified
(see 3.1).
3.6.4 Strength of terminals. When switches are tested as specified in 4.8.5, there shall be no
breakage, loosening, or rotating of terminals, and no damage to the switch body.
3.6.5 Strength of toggle lever, pivot, and lever stop. When switches are tested, as specified in 4.8.6,
there shall be no malfunction damage, breakage, or short circuit; switches shall operate mechanically and
electrically.
3.6.6 Strength of mounting bushing. When switches are tested as specified in 4.8.7, there shall be no
loosening of the mounting bushing or other mechanical damage.
3.6.7 Contact voltage drop. When switches are tested as specified in 4.8.8., the contact voltage drop
shall not exceed 2.5 millivolts initially and 5 millivolts after mechanical endurance.
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