Torque and Chrome

torque wrench? How do they work? and how I use it to apply a specific force.?

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1. A torque wrench is a wrench used to precisely set the torque of a fastening such as a nut or bolt. It is usually in the form of a socket wrench with special internal mechanisms. A torque wrench is used where the tightness of screws and bolts is crucial. It allows the operator to measure the torque applied to the bolt so it can be matched to the specifications. This permits proper tension and loading of all parts. A torque wrench indirectly measures bolt tension. The technique suffers from inaccuracy due to inconsistent friction between the fastener and its mating hole. Measuring bolt tension (bolt stretch) is more accurate but most often torque is the only means of measurement possible.
2. There are two basic types of torque wrench - beam type and "clicker" type. On a beam type, to apply a specific force, simply exert force on the handle until the pointer indicates the proper torque value on the scale. On a "clicker" type, the end of the handle is rotated to indicate a torque value, either in a small window, or on the handle itself. Exert force on the handle until the pivot clicks. Simple :) There's an explanation here that gives more details http://home.jtan.com/~joe/KIAT/kiat_3.htm , but the basics are above.