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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.
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- Specifications
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STANDARD TORQUE VALUE CHART. There is no difference in the above chart between the torque figures for fine or coarse threads. The torque figures for a finely-threaded fastener as compared to a coarsely-threaded fastener of the same diameter may be slightly higher but hardly worth mentioning. CAUTION.
Because there are many variables that affect the torque-tension relationship, the only way to determine the correct torque is through experimentation under actual joint and assembly conditions. Bolt torque chart reference guides include Grade 2, B7, A307, A325, Grade 8, A490, and Grade 5.
26 Ιουν 2024 · Bolt torque chart. The following chart appears in the 2019 Atlas Copco Industrial Tools and Solutions catalog. It gathers the three required variables to understand and determine the maximum recommended torque for your bolt: bolt size, bolt grade and friction.
U.S. Recommended Bolt Torque Table. ** Fine thread figures are for 1-14. Grade 2, 5, and 8 values are for plated bolts.
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.
Maximum tightening torques for US bolts. This chart displays values for lightly oiled threads. The tension is 70% of yield strength.