Torque Wrenches
Torque is a force causing torsion (rotation) in a turning device such as a shaft or a threaded bolt.
In the English measuring system, torque is expressed in foot-pounds, inch-ounces, inch-pounds, or (rarely) foot-ounces. In the metric system, torque is expressed in Newton-meters (sometimes stated as Newtons per meter, NpM) or some equivalent, such as Newtons per millimeter.
The exertion of torque (such as that applied to the head of a bolt) may be limited through the use of torque wrenches. This is especially important in softer materials, like aluminum and plastic. In any material, though, undertightening of a bolt can result in it coming loose, and overtightening can result in damaged threads or broken heads. At any rate, torque wrenches come in a variety of styles that may be categorized as either click release torque wrenches or gauged torque wrenches.
A click release torque wrench allows force to be applied up to some limit, set by the operator,......
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