Be careful about the no name torque wrenches. Even the best wrenches only claim + - 10 percent accuracy. Where I work we send our wrenches out annually to be calibrated / adjusted and find the cheaper ones to be wildly inaccurate to the point of being unuseable. For home use I have a Proto 1/2" drive 10-150 ft. lbs. and another Proto 1/4" drive 40-200 in. lbs. that cover my needs. Both are micrometer adjust clickers. During the Christmas season Sears had their torque wrenches on sale and I went to get a 3/8" drive to fill the gap. What was offered felt cheap in the hand and looked Chinese made. I still don't have a 3/8".
Keep in mind that a torque wrench tries to replicate bolt stretch through a twisting motion, bolt stretch being the truest indicator of clamping force. Point is thread condition and lubrication greatly influence how much bolt stretch is attained regardless of the twisting motion or torque applied. Dry threads vs. say threads coated with a moly lubricant equal different bolt stretch given the same amount of torque. Unless a specific lubricant is called for I just use engine oil on the threads and bolt flanges.
Sorry, I got derailed there.
Oh, and never use a clicker type torque wrench to loosen with.
Gray-haired riders donít get that way from pure luck.
Last edited by flash; 02-21-2010 at 07:49 AM.