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Recommended Torque Values (Inch-Pounds)
TORQUING COMPUTATION

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Figure 3-12.—Torque wrenches. technical manual, these values take precedence over the standard torque values provided in the Structural Hardware Technical Manual, NAVAIR 01-1A-8. Separate torque tables and torquing considerations are provided in NAVAIR 01-1A-8 for the large variety of nuts, bolts, and screws used in aircraft construction. You should use this manual when specific torque values are not provided as a part of the removal/replacement instructions. To obtain values in foot-pounds, divide inch-pound values by 12. Do not lubricate nuts or bolts except for corrosion-resistant instructed to do so, first if possible. When space considerations make it necessary to tighten the fastener by rotating the bolt head, approach the high side of the indicated torque range. Do not exceed the maximum allowable torque value. Maximum torque ranges should be used only when materials and surfaces being joined are of sufficient thickness, area, and strength to resist breaking, warping, or other damage. For corrosion-resisting steel nuts, use the torque values given for shear-type nuts. The use of any type of drive-end extension on a torque wrench changes the dial steel parts or where specifically reading required to obtain the actual values indicated in Always tighten by rotating the nut the torque range tables. See figure 3-12. 3-21







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