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This type of washer is especially effective as a lock washer when used with a soft substrate, such as aluminium or plastic, [8] and can resist rotation more than a plain washer on hard surfaces, as the tension between washer and the surface is applied over a much smaller area (the teeth). There are four types: internal, external, combination ...
Structural bolt DIN 6914 with DIN 6916 washer and UNI 5587 nut. A threaded fastener has internal or external screw threads. [7] The most common types are the screw, nut and bolt, possibly involving washers. Other more specialized types of threaded fasteners include captive threaded fasteners, stud, threaded inserts, and threaded rods.
Authorities disagree on whether nyloc nuts should be reused. For example, Carroll Smith (Carroll Smith's Nuts, Bolts, Fasteners, and Plumbing Handbook) notes that the nylon insert is not damaged by installation and therefore they can be reused many times, [1] and a Federal Aviation Administration Advisory Circular allows nuts to be reused if the prevailing torque is within specification. [4]
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The original hook-and-loop fastener was conceived in 1941 by Swiss engineer George de Mestral, [1] [2] [3] which he named velcro. The idea came to him one day after he returned from a hunting trip with his dog in the Alps. He took a close look at the burs of burdock that kept sticking to his clothes and his dog's fur.
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