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TM 9-254
6-11.
Safety Wiring Procedures - Continued
(9)
Use single safety wire (fig. 6-22) for emergency equipment. When used on emergency equipment,
safety wire must perform its function of preventing parts from moving or separating and must also be
capable of being broken easily when the equipment is needed. Examples of such usage are emergency
exits, emergency air brake levers, fire extinguishers, and snap slides. Table 6-2 lists the types of safety
wire and their uses.
Table 6-2. Safetywire
Safety wire
Identification
Specification
Use
Material
Diameter
No.
Nick-Chromium-
0.032
MS20995N32
QQ-W-390
General purpose,
Iron Alloy
Condition A
storage, bolts,
nuts, drain plugs
and cocks, cable
stops in tempera-
tures above 450°F,
corrosive areas,
and electrical
equipment.
Nick-Chromium-
0.020
MS20995N20
QQ-W-390
Turnbuckles: up to
Iron Alloy
1/16 of an inch
diameter cable,
3/32 of an inch
to 5/32 of an inch
diameter cable,
5/32 of an inch
diameter, or
larger, cable.
Corrosion
0.047
MS20995N47
QQ-W-423
Special high-
resistant
Condition A
strength appli-
steel
Type 302
cations.
Bare
0.020
MS20995CU20
QQ-W-343
Emergency parts,
copper
exits, air brake
levers, and fire
extinguishers.
b.
Safety Wire Installation. The following is a recommended procedure for installing safety wire.
6-18
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