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I have tried looking around the internet for an answer - but I can only find articles that explain what the clutch on a drill does.

I am very familiar not only with what they do but also with how they operate. I have always wondered, however, what the units for the numbers are. They don't seem to be anything standard.

My drill has a max torque of 725lbf-in. I have tried converting that into all of the different units for torque I can find, but none of them result in a 24 (my max torque setting), or anything in that range.

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The clutch on a drill or a driver is a very imprecise thing. It just has multiple settings (24 in your case) and often a separate "drill" setting which disables the clutch. Manufacturers don't specify actual torque values for the clutch settings. So the bottom line is you have a black box with 24 settings that gradually increase the torque after reaching which the chuck is disconnected from the motor and you hear the repetitive clicking sound and perhaps you have a "drill" setting with which there's no disconnection.

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Turn to 11 for the highest volume, it's more powerful than 10. Just means more or less torque at breakaway. Measuring precise torque requires a torque wrench. Or a very expensive calibrated power tool like used in the aircraft industry. – Fiasco Labs Jan 9 '13 at 6:38
Not only is it arbitrary, it's probably not linear either. The torque at 16 is unlikely to be twice the torque at 8, and the increase in torque between 2 & 3 is probably not the same as between 17 & 18. – bcworkz Jan 9 '13 at 23:24

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