Science and Math For Technology
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Torque Torque is a force which produces a turning effect. Picture yourself going through a revolving door. To turn the door you push at the farthet point from the hinge. The door then revolves. The distance from the center of the revolving door to your hand is called the torque arm. The torque arm distance in feet multiplied by the pushing force in pounds will result in an answer expressed in foot-pounds.   
Bolts, screws, and other fastening devices that require an exact amount of pressure are tightened with a torque wrench. Small fastening devices use torque forces measured in inch-pounds. Regular torque charts are used for brand-new fastening devices. Fastening devices that have been used before require less torque. Oily bolts also require less torque. The Greek letter tau stands for torque, and the torque arm length is r. Torque (Ft. lbs.) = force (in pounds) X torque arm feet Torque (in. lbs.) = force (in pounds) X torque arm inches   
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