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OK, I guess I originally misread your question. You are referring to inch-pounds (torque, I guess). Torque or work or energy is force (times) distance. So the [in lbs] implies that you are talking about pounds-force. With [lbf in], it is just clarifying that it is force.

Many people think of mass and 'weight' interchangably. lbs refers to mass. 2.2 lbs is approximately equal to 1 kilogram mass. lbf refers to force. a 1 pound mass (lb), will exert a 1 pound force (lbf), if there is 1 Earth 'g' of acceleration. (approx 9.8 m/s2 or 32.2 ft/s2). Alternatively, take that 1 kg mass, which 'weighs' 1 Newton. It has a mass of 2.2 lbs, and a 'weight' of 2.2 lbf.

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14y ago

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