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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. [2] The most prevalent form is the ratcheting socket wrench, often informally called a ratchet.
A ratchet consists of a round gear or a linear rack with teeth, and a pivoting, spring-loaded finger called a pawl (or click, in clocks and watches [1] [2]) that engages the teeth. The teeth are uniform but are usually asymmetrical , with each tooth having a moderate slope on one edge and a much steeper slope on the other edge.
The term wrench is generally used for tools that turn non-fastening devices (e.g. tap wrench and pipe wrench), or may be used for a monkey wrench—an adjustable pipe wrench. [1] In North American English, wrench is the standard term. The most common shapes are called open-end wrench and box-end wrench.
[4] [5] There was a rumor that Richard Evelyn Byrd, on his initial journey to Alaska, had a Crescent wrench in his provisions. [3] The Crescent Tool Company was acquired by a group of investors from Schoellkopf, Hutton & Pomeroy in 1960 after Marvin Peterson, Karl's son, sold it. [5] The combined company was renamed the Crescent Niagara ...
It can be turned with an adjustable wrench, combination wrench and 6- or 12-point sockets. The hex drive is better than square drive for locations where surrounding obstacles limit wrenching access, because smaller wrench-swing arcs can still successfully rotate the fastener.
A strap wrench is any of various types of wrench that grip an object via a strap or chain being pulled in tension around it until it firmly grips. High static friction keeps it from slipping. [1] Many strap wrenches have built-in handles. Others are made to receive the square drive of a ratchet wrench. The strap or chain can have various forms.