Page 202 2
nd
Edition – Rev 0
02-40
SAFETYING – MAINTENANCE PRACTICES
Figure 6. – Safety wiring twisting by hand
When using double-twist method of safety wiring, apply following guidelines:
.032 inch minimum diameter wire should be used on parts that have a hole diameter larger
than .045 inch.
Safety wire of .020 inch diameter (double strand) may be used on parts having a nominal hole
diameter between .045 and .062 inch with a spacing between parts of less than 2 inches.
When using the single-wire method, the largest size wire that the hole will accommodate
should be used.
Copper wire (.020 inch diameter), aluminium wire (.031 inch diameter), or other similar wire
called for in specific technical orders, should be used as seals on equipment such as first-aid
kits, portable fire extinguishers, or emergency valves.
A secure seal indicates that the component has not been opened. Some emergency
devices require installation of brass or soft copper shear safety wire. Particular
care should be exercised to ensure that the use of safety wire will not prevent
emergency operation of the devices.
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