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sex bolt, Chicago screw: A fastener comprising a mated pair of screw and post (binding barrel), which are a machine screw and a nut that is barrel-shaped. The nut has a flange and a protruding boss that is internally threaded. The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides the bearing ...
The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...
Bolts use a wide variety of head designs, as do screws. These are designed to engage with the tool used to tighten them. Some bolt heads instead lock the bolt in place, so that it does not move and a tool is only needed for the nut end. Common bolt heads include hex, slotted hex washer, and socket cap.
Knock-down fasteners can generally be assembled with a single driver, such as a hex key, which may be included in a hardware kit that comes with the product. They self-align when tightened, and allow for a secure connection without requiring drilling or gluing by the consumer. One common type of knock-down fastener is the cam lock, used in butt ...
Hillman acquired Serv-A-Lite, another distributor of fasteners and related hardware. Serv-A-lite was established in 1979 and based in East Moline, Illinois. The Servalite trademark is now applied to some electric lamp hardware. Hillman bought a sizeable Canadian rival distributor H. Paulin for $103 million in February 2013 [17] [18]
Fasteners used in automotive, engineering, and industrial applications usually need to be tightened to a specific torque setting, using a torque wrench. Nuts are graded with strength ratings compatible with their respective bolts; for example, an ISO property class 10 nut will be able to support the bolt proof strength load of an ISO property ...
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