crow's-foot spanner A wrench that is used for gripping the nuts on the ends of tubes. It is similar to a box-end wrench but, instead of encircling the nut completely, it has a narrow opening just wide enough to allow the wrench to fit over the tube, and thick jaws to increase the contact area with the nut. This allows for maximum contact on plumbing nuts, which are typically softer metals and therefore more prone to damage from open-ended wrenches. common

DeWalt’s 20-volt 880 Lithium-Ion cordless impact is a 1/2-inch drive job with a whopping 400 foot-pounds of torque rating. This tool has a variable-speed trigger with an electric brake; an ergonomic handle provides added control and comfort. It even includes an LED light with 20-second delay, providing greater visibility when working in dark areas. See the Summit Racing catalog for more info. (Image/Summit Racing)


Our Torque Wrenches offer a dependable fast and Our Torque Wrenches offer a dependable fast and accurate way to tighten fasteners in automotive agricultural and commercial/industrial applications. Reversible ratcheting heads make work easier in tight spaces and an audible signal lets you know your target torque has been reached. A slide-back adjustment collar design and large laser-etched markings ...  More + Product Details Close
Old English wrencan "to twist," from Proto-Germanic *wrankijanan (cf. Old High German renken, German renken "to twist, wrench," Old English wringan "to wring"), from PIE *wreng- "to turn" (cf. Sanskrit vrnakti "turns, twists," Lithuanian rengtis "to grow crooked, to writhe"), nasalized variant of *werg- "to turn" (cf. Latin vergere "to turn, tend toward"), from root *wer- (3) "to turn, bend" (see versus). Related: Wrenched, wrenching.
Impact wrenches are widely used in many industries, such as automotive repair, heavy equipment maintenance, product assembly, major construction projects, and any other instance where a high torque output is needed. For product assembly, a pulse tool is commonly used, as it features a reactionless tightening while reducing the noise levels the regular impacts suffer from. Pulse tools use oil as a medium to transfer the kinetic energy from the hammer into the anvil. This gives a smoother impulse, a slightly lower torque to weight ratio and a possibility to design a shut off mechanism that shuts the tool down when achieving the correct torque. Pulse tools are not referred to as "impact wrenches" as the performance and technology are not the same.[according to whom?]
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