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To convert pounds (lbs) to Newtons (N), multiply by 4.448 To convert inches (in) to millimeters (mm), multiply by 25.4. Note: When using Zinc Plated (lubricated with wax) Top Lock Nuts, the K value can vary be-tween 0.12-0.16. For additional technical information, contact Fastenal Engineering at engineer@fastenal.com.
The following table shows the tightening torque for metric thread fasteners. In the List metric bolt torque chart you find the metric torque unit in Nm and ft lbs. You can also made an conversion from the unit Nm to ft lbs and also from ft lbs to Nm.
Torque has been converted into ft/lbs by dividing the result of the formula by 12; All calculations are for Coarse Thread Series (UNC). Grade 2 calculations only cover fasteners 1 ⁄ 4 “-3 ⁄ 4 ” in diameter up to 6″ long; for longer fasteners the torque is reduced significantly.
Another torque unit used in the USA is the foot-pound (abbreviated ft-lb.), which is the force in pounds along a one-foot long lever. It is possible to convert between the two units by multiplying or dividing by twelve.
Metric Fine Thread Bolt Torque. The following table shows the tightening torque for metric fine thread fasteners. In the List you find the metric fine torque unit in Nm and ft lbs. You can also made an conversion from the unit Nm to ft lbs and also from ft lbs to Nm.
Torque-Tension Relationship for Metric Fasteners. 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 loads estimated as 75% of proof load for specified bolts. Torque values listed in foot-pounds .
Bolt Torque Chart. Suggested Starting Torque Values. Notes: Values calculated using industry accepted formula T = KDP where T = torque, K = torque coefficient (dimensionless), D = nominal diameter (inches), P = bolt clamp load (lbs).
