Precision Torque (pp.631-652) - STANLEY - #1

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Untitled table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:7.00pt "Arial", sans-serif; } .font1 { font:19.00pt "Arial", sans-serif; } PRECISION TORQUE There are times when being obsessive is a real virtue - like when you're designing and building torque wrenches. Just consider what these tools are asked to do. When a wrench tightens a bolt the rotational force, or torque, actually causes the bolt to stretch a bit as the threads seat tightly against one another. The trick is to put enough force on the threads that the bolt won't work loose, yet not enough that you risk cracking the metal. This "tolerance" range can be quite narrow, and staying within it may be the difference between a smooth running machine and one stopped dead in its tracks. In the case of military equipment or an aircraft it can literally be a matter of life and death. A torque wrench has to make sure that fasteners are tightened within theirtolerance range, and it has to continue doing so even after manyuses. Because they're so important, we spare no effort to make our wrenches accurate. We manufacture wrench parts from high-grade steel, then heattreat critical parts to makethem even more durable and wear-resistant. Then we assemble them according to the most precise manufacturing specs. Our workhorse torque wrench is the easy-to-use micrometer or "click" style wrench, and a great example of our attention to detail is thatwrench's internal spring. The spring holds the wrench's tang, tilt blockand plunger in place until the set torque is reached, afterwhich those components snap off center with a "click" that the user can hear and feel. A worn spring will throw a wrench out of calibration, so Proto goes to great lengths to manufacture springs that keep their original shape overtens of thousands of uses. Proto® micrometer torque wrenches are offered in three different product series: "C" series wrenches are designed for normal torque applications in industrial and manufacturing settings while "CX" series wrenches are calibrated for use where extreme precision and accuracy is required, such as in aerospace, aviation, and military applications. The CXCERT series wrenches include documents certifying N.I.S.T. (National Institute of Standards and Technology) traceability. Otherfeatures include: • Scales with metric and English numbers on select models. •A positive locking mechanismthattells users when they have locked in the desired torque. • A thin head design that fits into tight areas. • Long handles, which letthe user reach the set torque using less force. • A large, comfortable-to-use grip. These wrenches are calibrated to ±3% of torque setting clockwise and ±6% of the torque setting counterclockwise at 20% to 100% of full scale. You can also special order models certified to +/- 2% in the clockwise direction. Pre-set torque wrenches are also available on special request, and are idealfor assembly work where torque requirements stay constant. In addition, we make a number of other torque products, for applications ranging from general manufacturing to engine maintenance. These products include Electronic Torque Wrenches, Dial Torque Wrenches, and even Torque Screwdrivers. We also have full-featured electronic Torque Meters and transducers.