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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 set of metric spanners or wrenches, open at one end and box/ring at the other. These are commonly known as “combination” spanners. A wrench or spanner is a tool used to provide grip and mechanical advantage in applying torque to turn objects—usually rotary fasteners, such as nuts and bolts—or keep them from turning.
The bridge is a truss bridge with an approximately 100-foot span. [7] To open the bridge for marine vessels, an electric motor drives a pinion gear which engages a ring gear in the base of the bridge. If the electric motor is not working, the bridge can also be opened manually using a large wrench (approx. 8' DEEP socket with an 8' long handle).
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A square screw drive uses four-sided fastener heads which can be turned with an adjustable wrench, open-end wrench, or 8- or 12-point [69] sockets. Common in the 19th and early 20th centuries, when it was easier and cheaper to manufacture than most other drives, it is less common today (although still easy to find) because the external hex is ...
1938, the company patented the world's first click-type torque wrench. 1939, the first torque screwdriver was patented. 1949, the company patented a ring-ratchet system with interchangeable tool inserts. 1953, a design patent was registered for the multifunctional "3=1" combined open-jaw and joint-socket spanner. Saltus in former times
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