Mountz, Inc.
www.mountztorque.com
This document is intended to provide general basic advice for effective or optimum use. Before Using a Torque Wrench Not all torque wrenches are alike. Take time to read all instructions provided to fully understand the working features and manufacturer recommendations. Before use, test the tool to make sure it functions properly and has a current calibration sticker or calibration certificate indicating its validity. Ensure that the socket or bit fits correctly on the drive and the adjustment mechanism functions properly. Understanding the Scale and Tool Type Most torque wrenches have a scale that can be adjusted. Externally adjustable scales typically have a master scale and sometimes a micrometer scale. Increments or graduations indicate how fine a tool can be set. Wrenches with a micrometer scale can be set to finer graduations and are more complex as two scales adjust simultaneously. Internally adjustable (preset) tools do not have an external scale and are typically used in a production environment or for one torque setting. Understanding Accuracy Accuracy can be stated in terms of Full Scale (FS) or Indicated Value (IV). There is a big difference in result as FS accuracy indicates the allowable error over the full-scale range of the tool. IV accuracy indicates allowable error at the set point on the wrench.
IV stated wrenches are more accurate, especially on the lower end of the range. It is important to determine if the accuracy needed for an application can be obtained with the torque wrench selected. The table shows the
Full Scale
% OF Scale (Torque)
Indicated Value (5% at each value)
(5% throughout range)
95 - 105
100
95 - 105
45 - 55
50
47.5 - 52.5
25 - 35
30
28.5 - 31.5
5 - 15
10
9.5 - 10.5
Phone: 408.292.2214
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