Types and Uses - Continued

Types and Uses - Continued - 14256_163

Types and Uses - Continued - 14256_165

Tools And Their Uses - Hand tools and what they are used for
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TM 9-243 TYPES AND USES - Continued TORQUE WRENCHES (Cont) A scale torque wrench has a rod which runs parallel to the handle and the drive element. This rod moves across the scale to the right or left as torque is applied. POWER TORQUE WRENCH Using a powerful gear train, the power torque wrench is completely mechanical in operation. The power torque wrench is operated by a hand crank. The torque is calibrated in foot pounds, which is shown by a dial indicator on the top face of the power torque wrench. This type of torque wrench is used for tightening nuts and bolts requiring 200 or more foot pounds of torque. NOTE A special feature of this type of torque wrench is that it is possible to loosen as well as tighten nuts and bolts. SPANNER WRENCHES Two basic types of spanner wrenches are the hook-type and the pin-type. Hook-type spanner wrenches are either fixed or adjustable and are normally used to tighten fire hoses or similar couplings which have a protruding lip. Pin-type spanner wrenches have pins protruding from the handle which fit into holes in the coupling or plate to be tightened or loosened. Spanner wrenches are special purpose wrenches and are to be used only for their intended purpose. HOSE COUPLING PIN FIXED HOOK ADJUSTABLE HOOK Three kinds of hook-type wrenches include the hose coupling pin, for tightening and loosening hose coupl- ings, the fixed hook, for tightening or loosening coupl- ings with protruding rims or edges, and the adjustable hook-type. The adjustable hook-type is similar to the fixed hook- type. However, it may be adjusted around objects and fastened before use. 25-12 Change 1

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