MIL-DTL-16377J(SH)
3.5.8.5 Threads in aluminum. In general, threads in aluminum alloys shall not be used. Wherever practical,
through bolt holes shall be used. Inserts in aluminum shall be provided only where screws or bolts will be removed
for routine maintenance of the equipment or where maximum stress in the screw or bolt is required for alignment of
a vital part. Inserts in aluminum shall not be provided for securing identification or information plates, terminal
boards, or other items that are removed only when equipment is modified. Inserts shall be of austenitic, corrosion-
resistant steel.
3.5.8.6 Anti-seizure coating. Aluminum and steel fastening parts (screws and bolts) in contact with threaded
aluminum shall be coated with an anti-seize compound.
3.5.8.7 Threads locking. Unless otherwise specified herein, nuts, bolts, studs, and screws shall be secured by a
locking device. Satisfactory locking devices are split ring type lock washers, nut and lock nut, self-locking nuts, and
castellated nuts with cotter pin or safety wiring. Internal tooth type lock washers generally shall not be used.
External tooth type lock washers may be used where the weight of the part does not exceed 6 ounces per screw.
Nuts or screws with captive lock washers may be used provided they are replaceable with common type screws and
lock washers. Oval head screws, when used with cup-type washers, and pan head screws on identification plates do
not require locking devices. Thread forming screws do not require locking devices. Screws with an O-ring seal do
not require locking devices. When a bonding agent is used to permanently secure two or more threaded fastening
devices, an over-sized thread may be used to provide a stronger bond. The over-sized threads shall be checked
during the production run with "GO" and "NO-GO" gauges to ensure conformance to the original established
dimensional limits.
3.5.9 Seals and special screws. Lead seals or special screws which require a special tool (see 3.10.1) for
removal shall be used for explosionproof and combined explosionproof-watertight portable fixtures. Seals or special
screws used require approval (see 6.11).
3.5.10 Gaskets. Unless otherwise specified in the applicable specification sheet, gaskets shall be as specified in
3.5.10.1 Window gaskets for type I, class 2 fixtures and type III luminaires using legacy fluorescent windows.
Window gaskets for Type I, Class 2 fixtures and Type III luminaires utilizing legacy Type I, Class 2 windows shall
be neoprene tubing (45-55 durometer Type A hardness); 0.295 inch maximum and 0.245 inch minimum outside
diameter (od); 0.062 inch inside diameter (id). No petroleum or silicon base lubricants shall be used when extruding
gaskets. Gaskets shall be securely cemented at the scarf joint and shall completely fill the groove without stretching
or bunching. Gaskets shall be retained in their grooves without resorting to cement. Retainer may be continuous
(see 3.5.11.7).
3.5.10.2 O-ring gaskets. Unless otherwise specified in the applicable specification sheet, O-ring gaskets shall
be commercial neoprene (65-75 durometer Type A hardness). No petroleum or silicon base lubricants shall be used
when molding gaskets. Sizes of O-ring gaskets for Type I legacy window assemblies shall be as shown on figures 1,
3.5.10.3 U-shaped gaskets. U-shaped gaskets for parabolic aluminized reflector (PAR) lamps, roundels, and
lenses shall be commercial neoprene rubber (45-55 durometer Type A hardness) of a continuous band and of
circumference less than the diameter of the PAR lamp, roundel, or lens. No petroleum or silicon base lubricants
shall be used when molding gaskets. The gaskets shall be so arranged that when stretched over the PAR lamp,
roundel, or lens, the material will form over the edge and the faces of the PAR lamp, roundel, or lens to form a U-
shaped gasket.
3.5.10.4 Gasket coating. O-rings and tubular gaskets shall be coated with a lubricant, glycerin, or equivalent
before final assembly in the fixtures.
3.5.10.5 Window gaskets for type III luminaires. Window gaskets for Type III luminaires shall be to
manufacturer s design when not utilizing legacy window components. No petroleum or silicon base lubricants shall
be used when extruding gaskets. Gaskets shall be securely cemented at scarf joint, and shall completely fill the
groove in the luminaire without stretching or bunching. Gaskets shall be retained in their grooves without resorting
to cement.
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