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Socket set with ratchet (above), four hex sockets and a universal joint. A socket wrench (or socket spanner) is a type of spanner (or wrench [1] in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.
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A ratchet (occasionally spelled rachet) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools. The word ratchet is also used informally to refer to a ratcheting socket wrench.
[15]: 85–86 They also allow for the use of angled screw drivers and trim head screws. The socket-headed Robertson screws reduce cam-out, stop a power tool when set, and can be removed if painted over or old and rusty. [15]: 85–86 In industry, they speed up production and reduce product damage. [15]: 85–86
The company has a tool line of over 3,500 items including wrenches, ratchets, screwdrivers, tool boxes and air tools. In 2021, SK was acquired by Hangzhou GreatStar Industrial . Jay Leno described the company as "an iconic American brand for decades," [ 2 ] and the company is known for inventing the round-head ratchet wrench .
In 1963, Sears employee Peter M. Roberts developed a quick release feature for socket wrenches. The feature allowed a person using such a ratchet to remove the socket from the wrench with one hand, freeing the second hand from grabbing the socket while the other hand held the ratchet. [36]
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