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Use Prevailing Torque All-Metal Nut chart if using this style of nut. = Nominal Diameter. = Clamp Load For J429 Grade 5 and 8, FNL Grade 9, A574, Class 4.6, 8.8, 10.9 and 12.9, the clamp loads are listed at 75% of the proof loads specified by the standard. For A307 Grade A, 75% of 36,000 PSI is utilized.
Due to many variables that affect the torque-tension relationship like human error, surface texture, and lubrication the only way to determine the correct torque is through experimentation under actual joint and assembly conditions.
U.S. Recommended Bolt Torque Table. * Sizes from 4 to 10 are in in.-lbs. Sizes from 1/4 up are in ft.-lbs. ** Fine thread figures are for 1-14. Grade 2, 5, and 8 values are for plated bolts.
The tightening torques below are for imperial US bolts with tension approximately 70% of yield strength. The values are for slightly lubricated bolts. For dry bolts increase the torques with approximately 30%.
US Recommended Bolt Torque. † Fine thread figures are for 1"-14. Grade 2, 5, and 8 values are for slightly lubricated bolts.
Torque Table. The following suggested tightening torques provide an excellent starting point for determining torque requirements. Remember, you may need to vary these numbers somewhat based on the individual joint or the amount of fastener lubrication.
Maximum tightening torques for US bolts. This chart displays values for lightly oiled threads. The tension is 70% of yield strength.
Torque is only an indirect indication of tension. Under/over tightening of fasteners can result in costly equipment failure or personal injury. NOTES: The torque values can only be achieved if nut or tapped hole has a proof load greater than or equal to the bolt’s minimum tensile strength.
Bolt torque chart reference guides include Grade 2, B7, A307, A325, Grade 8, A490, and Grade 5. AFT Fasteners is your trusted source for fastener information.
The torque values can only be achieved if nut (or tapped hole) has a proof load greater than or equal to the bolt's minimum ultimate tensile strength. Clamp load calculated as 75% of the yield strength for the B7 specified in ASTM A193.