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Alternatives to wire nuts9/8/2023 ![]() ![]() This is done by passing a couple of turns of mousing wire through the reach-hole provided for this purpose in the unthreaded end of the clevis pin and around the body of the shackle's hoop. Mousing (pronounced mowzeeng) is the application of a molly or safety wire, called mousing wire in this use, to secure a threaded clevis pin to a shackle. Since it remains twisted instead of unraveling, it acts as a fixed loop and will not back out without considerable force (greater than the stresses which it is intended to counter) being applied. The same process is then repeated around the anchor point, which could be another fastener. This property allows it to remain locked around an object, such as when it is passed through a small hole on a fastener, looped back upon itself and then twisted. Since safety wire is made of a malleable alloy, it retains its shape after being bent, rather than springing back to its original shape. The wire itself maintains tension and remains in place by being twisted around itself and attached to the fastener to be secured on one end and an anchor point (which could be another fastener) on the other end. Briefly, safetying is defined as: "Securing by various means any nut, bolt, turnbuckle etc., on the aircraft so that vibration will not cause it to loosen during operation." These practices are not a means of obtaining or maintaining torque, rather a safety device to prevent the disengagement of screws, nuts, bolts, snap rings, oil caps, drain cocks, valves, and parts. The word safetying is universally used in the aircraft industry. There are a few techniques for different applications. Typically, the wire is threaded through a hole drilled into a fastener or part, then twisted and anchored to a second fastener or part, then twisted again. ![]() In aircraft and racing applications, stainless steel wire is used, such as in 0.8 mm (0.032 in) diameter. Safety wire is available in a variety of gauges and materials, depending on the application. The presence of safety wiring may also serve to indicate that the fasteners have been properly tightened. ![]() Safety wiring of two pairs of drilled bolt-heads wired one-to-the-otherĪ safety wire or locking-wire is a type of positive locking device that prevents fasteners from falling out due to vibration and other forces.
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