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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.
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. Clamp loads are based on 75% of the minimum proof loads for each grade and size.
Torque-Tension Relationship for A307A, Grade 5, 8 & 9 Bolts. 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 proof load when specified by the standard. ASTM A307 utilized 75% of 36,000 PSI.
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 proof load when specified by the standard. ASTM A307 utilized 75% of 36,000 PSI. Torque values for 1/4 and 5/16-in series are in inch-pounds.
Bolt Torque Calculator. Calculate required bolt torque. The relation between applied torque and axial force - or load - in a bolt can be calculated in this general equation as. T = K F d (1 - l/100) (1) where. T = wrench torque (Nm, lbf ft) K = constant that depends on the bolt material and size.
Torque (ft lbs) Bolt Size TPI Proof Load Clamp Load Waxed Galv Plain ... 9⁄16 12 6552 4914 23 58 46 5⁄8 11 8136 6102 32 79 64 3⁄4 10 12024 9018 56 141 113 7⁄8 9 15200 11400 83 208 166 1 8 20000 15000 125 313 250 11⁄8 7 25200 18900 177 443 354 ... SAE J429 grade 5 bolts do not exceed 1-1/2" diameter. ASTM A193 B7 Tension lbs Tightening ...
It lists the nominal diameter, thread size, tensile stress area, and recommended clamp loads and tightening torques for each combination using formulas that calculate torque based on the bolt's diameter, clamp load, and a coefficient (K) for the thread condition.
