Installing safety wire involves applying one of two methods. The double-twist method is more common of the two, while the single-wire method can be more useful for nuts, bolts, and other fasteners in any closely grouped configurations. Single-wire applications also include parts for electrical systems and other hard-to-reach places.
When using the double-twist method, the diameter of the wire depends on the type of fasteners. Parts with hole diameters exceeding .045 inches around will require wiring of .032 safety wire inches in diameter. Those with hole diameters between .045 and .062 inch and spacing of fewer than 2 inches between each part require wire double-strand safety wire of .020 inch in diameter. However, the single-wire method often requires the use of the largest safety wire thickness that can fit in the fasteners hole.
For additional consideration, aluminum wire of .031 inch diameter, copper wire of .020 inch diameter, and similar types of safety wire including ss safety wire, function as seals on specific forms of equipment. This is the perfect application for portable fire extinguishers, first-aid kits, emergency valves, and equipment with similar construction.