Usage:
Three new models of torque wrenches are available from the Parts Department. These torque wrenches click (make a noise) when the bolt or nut has been tightened to the desired torque. After this click there is a sudden release and several degrees of free movement. Use these click-type torque wrenches to tighten bolts and nuts in locations where it is difficult to read the dial-type torque wrenches.
"Click-type" torque wrenches.
The torque wrenches come in three capacities, with three different part numbers. The 5P7425 Torque Wrench is adjustable for applications between 30 and 200 lb ft (40-270 N·m). The 5P7426 Torque Wrench is for applications between 50 and 400 lb ft (70-540 N·m). The 5P7427 Torque Wrench can be used in applications between 100 and 600 lb ft (135-810 N·m). The wrench handle is turned to adjust these wrenches to the desired setting. To make the torque selection, put the micrometer marks in the handle in alignment with the desired torque shown on the scale of the stationary part of the wrench. A locking ring and a screw make sure that the setting will not be changed by accident. These wrenches can be used in both directions (left or right). They have an accuracy of ± 4% to the right and ± 6% to the left. Dial-face torque wrenches have an accuracy of ± 2% in either direction.
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After you hear the "click" do not put any more force on the handle as the release is very short and "over tightening" can be the result. "Click-type" torque wrenches use a tension spring mechanism. After use, always turn the calibrated handle back to the minimum capacity on the adjustment scale. If this is not done, the spring can take a permanent set (deformation) and lose its accuracy. For these reasons, it is most important to check the "click-type" torque wrenches regularly with a torque tester.
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For this purpose there is a 1P7460 Torque Tester available. Extra care must be taken when you use the torque tester because it is easy to follow through with force on the handle, past the short release of the wrench. This will give you a reading much higher than the correct one.
If the ratchet heads in the wrenches are damaged, there are kits available to make the repair. The kits are shown in the chart that follows:
NOTE: If any of these torque wrenches loses its accuracy, it must be sent to a Snap-On Tools Service Center for repair.