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| MIL-D-18641F(SH)
3.11.15 Thread engagement. Stud engagement shall hold the maximum design load.
Engagement shall be not less than the diameter of the fastener. Nuts shall be fully engaged. For
a threaded fastener, not less than one thread nor more than four threads shall protude beyond the
crown of the nut. For threaded fasteners that have torque requirements, the bolting shall be
tightened to a stipulated torque value by means of a torque wrench.
3.11.1.6 Screw thread selection.
3.11.1.6.1 Unified thread series. Unless otherwise specified herein, screw threads shall be of
the unified thread series in accordance with ANSI B1.1.
3.11.162 Coarse and fine thread series. The coarse thread series shall be used unless the
component design indicates a necessity for the fine thread series.
3.11.1.63 Eight-thread series. For fasteners of diameter 1 inch and larger, the eight-thread
series shall be used.
3.11.2 Welding and allied processes. Welding and allied processes shall be in accordance with
MIL-STD-278. Welded joints, except vent and drain nipple root connections, on the salt water
side of heat exchangers subject to submarine submergence pressure shall be radiographable.
Brazed connections may be used for vent and drain attachments to the salt water side of heat
exchanger subject to submarine submergence pressure only for the case of gun metal and cast
bronze water boxes; when used, they shall permit ultrasonic testing for bond and shall be fabricated
and inspected in accordance with NAVSEA 0900-LP-001-7000, except that requirements for use
of pre-inserted rings do not apply to the root connection. Brazing alloy shall contain not less than
43 percent silver. All pressure boundary welds regardless of size, fresh and sea water, shall be
welded inside and out. Joints accessible only from one side shall be purged and welded with 100
percent penetration
3.113 Materials for type I evaporators and type V heat recovery units. The materials used
in the construction of the evaporators of class 1 distillation units shall be as shown in table I.
Materials for class 2 distilling units shall be as specified in table I, except that copper-nickel alloy
shall be 90-10 composition.
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