Our test was simple: Using a torque wrench calibration unit, we set each wrench to a specific torque value on its adjustor. We decided to do a simple calibration test on a trio of half-inch drive torque wrenches that lived in our workshop. While we know that a new, high-end torque wrench from Snap-On or Precision Instruments will be calibrated perfectly through its range of adjustment, once it lives in the trunk of your car or the bottom of your toolbox, all bets are off. Well, that raises another good question: How well calibrated is your torque wrench? After all, how well calibrated is your mind’s perception of gutendtheit, anyway? If you’re like most of us, you probably use your trusty torque wrench when tightening an important fastener. If it’s too tight, you risk stripped threads or broken fasteners. If it’s too low, the bolt or nut may work itself loose. If you work on cars, you’re probably familiar with gutendtheit-we’ve all twisted wrenches until the bolt or nut felt “good and tight.” But is the bolt that’s keeping your engine together, suspension attached or wheel secured to your car really tightened to the proper torque?
