Debbie Welch Wrenches September 10th, 2018 - 01:34:12
Of the two types of torque wrenches, the micrometer wrench is definitely the more accurate. Typically, they are rated as being accurate to four percent of torque set. However, this accuracy can easily be lost if the wrench is not reset to zero before storage. Beam wrenches don't have this possibility of losing their accuracy, but are less accurate right out of the box. The accuracy of these beam wrenches is typically 12 percent, but can be less on higher torque settings, especially if the operator's hand is shaking from the pressure they are applying.
Micrometer wrenches are pre-set to the required torque on a vernier scale. An internal spring loaded mechanism measures the torque. When the bolt is tightened to the desired torque it "clicks."
Torque wrenches are precision tools and should be treated as such. Although most micrometer wrenches have a reversible ratchet head, they really should not be used as a ratchet, and especially not as a breaker bar. Most people who break their torque wrenches do so by trying to loosen an overly tight bolt with it. This overly stresses the internal mechanism, causing it to break, especially if the micrometer isn't set to a higher torque value than the pressure that is being applied.
An automotive tool set should contain a variety of common wrench sizes to handle automotive repairs while on the road. By having a wrench set in your vehicle you are prepared for any emergency car repairs that may be needed.
Metric tools and metric mechanics sets, in addition to standard wrenches, keep you covered for any repair situation. By having an array of metric tools conveniently available you can grab the 8mm or 15mm wrench you need to get the job done, slip it in your pocket and you are ready to go. The roll out case keeps your combination wrenches well organized and ready for automotive jobs or other tasks. In addition to your metric mechanics set, you may wish to purchase specialty manufactured wrenches which can meet the most exacting specifications, including sets that are designed to handle non-standard bolts. A complete set of metric tools for your assembly and repair needs is as essential as a standard tool set which includes the commonly used, 1/4″, 3/8″, 1/2″ and 3/4″ combination wrench.