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Minimum Prevailing Torque For ANSI Inch Size Hardware
Engineering Hardware Design Guide
Minimum Prevailing Torque Values for ANSI Inch Nuts Fine and Course threads.
PREVAILING TORQUE . The torque required to run a nut down a thread on certain types of nuts designed to resist vibration loosening. The resistance can be provided by a plastic insert or a noncircular head. PREVAILING TORQUE NUT. A type of lock nut which has a prevailing torque to assist in preventing self loosening.
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FINE THREAD SERIES PREVAILING TORQUE
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THREAD SIZE
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MINIMUM PREVAILING TORQUE
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7/16 -20
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8 inch-pounds
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1/2 -20
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10 inch-pounds
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9/16 -18
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13 inch-pounds
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5/8 -18
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18 inch-pounds
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3/4 -16
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27 inch-pounds
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7/8 -14
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40 inch-pounds
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1 -14
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55 inch-pounds
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1-1/8 -12
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73 inch-pounds
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1-1/4 -12
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94 inch-pounds
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COARSE THREAD SERIES PREVAILING TORQUE
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THREAD SIZE
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MINIMUM PREVAILING TORQUE
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7/16 -14
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8 inch-pounds
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1/2 -13
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10 inch-pounds
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9/16 -12
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14 inch-pounds
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5/8 -11
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20 inch-pounds
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3/4 -10
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27 inch-pounds
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7/8 -9
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40 inch-pounds
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1 -8
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51 inch-pounds
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1-1/8 -8
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68 inch-pounds
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1-1/4 -8
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88 inch-pounds
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