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The use and effectiveness of spring lock washers has been debated, with some publications [10] [who?] advising against their use on the grounds that, when tight, the washer is flat against the substrate and gives no more resistance to rotation than a normal washer at the same torque. A 1990 NASA manual states "In summary, a lockwasher of this ...
A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut, [1] stiff nut [1] or elastic stop nut, [2] is a nut that resists loosening under vibrations and torque. Prevailing torque nuts have some portion of the nut that deforms elastically to provide a locking action. [ 2 ]
A proper pre-load (or clamp-load) is one way to keep a bolted joint from coming loose, but belleville washers usually have lower pre-loads than bolts (1/4" grade 8 capscrew will have a pre-load of about 2800 lbf, and belleville washers for 1/4" hardware might have a compressed load of 50-1000 lbf).
In normal use, a nut-and-bolt joint holds together because the bolt is under a constant tensile stress called the preload.The preload pulls the nut threads against the bolt threads, and the nut face against the bearing surface, with a constant force, so that the nut cannot rotate without overcoming the friction between these surfaces.
In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: lock washers, jam nuts, eccentric double nuts, [1] specialist adhesive thread-locking fluid such as Loctite, safety pins or lockwire in conjunction with castellated nuts, nylon inserts , or slightly oval-shaped threads.
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A safety wire is used to ensure proper security for a fastener. The wire needed is long enough to reach from a fixed location to a hole in the removable fastener, such as a pin — a clevis fastener, sometimes a linchpin or hitch-pin through a clevis yoke for instance — and the wire pulled back upon itself, parallel to its other end, then twisted, a single end inserted through a fastener ...
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