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Page Title:
Staking, and Retaining Compounds |
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|  MIL-R-23016(Wep)
(Continued)
3.1.17
(a)
Flat-head screws, the heads of which are adjacent to metals,
may be staked by the usual center-punch method or by up-
setting the adjacent metal into the ends of the slot.
(b)
When screw heads of any type are adjacent to non-metal,
with or without intervening washers, the facing surfaces
shall be thoroughly covered with a suitable retaining
compound.
(c)
Self-locking nuts of specifically approved types, safety
tiring, and castellated nuts with cotter pinning are
acceptable.
(d)
Locking devices are not required with screw assemblies
involving instrument laws and other items which have been
standardized without locking means.
3.1.17.1
Staking, and Retaining Compounds:
Staking by means of upsetting metal or by using a suitable re-
taining compound is acceptable. Neither shall be used when the
assembly will be disassembled frequently.
3.1.17.2
Non-metals:
When screw threads engage tapped holes in non-metals, an approved
retaining compound shall be applied to such threads.
3.1.18
Magnesium Alloys:
When magnesium-alloy parts are used in direct contact with dis-
similar metals extreme caution shall be exercised in the selec-
tion of the proper alloy to guard against electrolytic corrosion.
When possible, insulating coatings such as zinc-chromate primer
shall be applied, or in cases where extreme exposure is contem-
plated, the use of gaskets is desirable. Such magnesium parts
and all other parts of dissimilar metal normally attached thereto,
when tested as an assembly, shall successfully withstand a 50-hour
salt spray test in accordance with Federal Test Method Standard
No. 151. At the completion of the 50-hour salt spray test, the
sample shall exhibit no signs of destructive corrosion as defined
In 3.1.11, and shall be capable of being easily disassembled.
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