Table F-1. Breakaway Torque

TM-55-1560-307-13P AH-1E/F/P/S Helicopter Manual
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TM 55-1560-307-13&P Table F-1. Breakaway Torque MINIMUM BREAKAWAY TORQUE FOR USED ALL METALLIC AND NONMETALLIC SELF-LOCKING NUTS NUT SIZE MIN BREAKAWAY TORQUE (IN-LBS) FINE THREAD 10-32 2.0 1/4-28 3.5 5/16-24 6.5 3/8-24 9.5 7/16-20 14.0 1/2-20 18.0 9/16-18 24.0 5/8-18 32.0 3/4-16 50.0 7/8-14 70.0 1-12 90.0 1 1/8-12 117.0 1 1/4-12 143.0 1 3/8-12 180.0 1 1/2-12 210.0 COARSE THREAD 4-40 NOTE 6-32 NOTE 8-32 NOTE 10-24 NOTE 1/4-20 NOTE 5/16-18 7.5 3/8-16 12.0 7/16-14 16.5 1/2-13 24.0 9/16-12 30.0 5/8-11 40.0 3/4-10 60.0 7/8-9 82.0 1-8 110.0 1 1/8-7 137.0 1 1/4-7 165.0 1 3/8-6 200.0 1 1/2-6 230.0 1 3/4-5 300.0 NOTE: TEST NUT FOR MINIMUM BREAKAWAY TORQUE BY ATTEMPTING TO INSERT A MATCHING BOLT BY HAND. REUSE ONLY THOSE NUTS THAT CANNOT BE TIGHTENED DOWN WITH FINGERS AFTER THE LOCKING ACTION ENGAGES BOLT OR STUD. NUTS THAT DO NOT MEET THE MINIMUM BREAKAWAY TORQUE SHALL NOT BE USED. F-2

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