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The bolt is stressed up to the proofload value, and if there is no deformation, elongation, or fracture, then the bolt is deemed to have passed. For bolting specifications that do not have a published proofload, it is usually calculated at 92% of minimum yield strength.
These metric bolt torque charts show the ideal tightening torque for class 8.8, 10.9, and 12.9 bolts for both wet and dry tightening. The bolt’s class indicates its material strength, with higher numbers meaning higher tensile and yield strength.
TORQUE-TENSION REFERENCE GUIDE Printed in U.S.A. • Supply Part Number: 9702365 • AS 06/14 Torque Poster For additional technical information, contact Fastenal Engineering at engineer@fastenal.com. Nominal Dia. (in.) Threads per inch 307A ASTM A307 Grade A SAE J429 Grade 5 SAE J429 Grade 8 F N L G 9 FNL Grade 9 Clamp Load (Lbs.) Tightening ...
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.
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.
Bolt Torque Chart showing suggested torque values and corresponding bolt clamping forces for various sizes and specifications of fasteners.
The charts below show the ideal tightening torque for each bolt grade for a variety of sizes. The size column also includes the thread count. Identify the grade, size, and thread density of your bolts and refer to the tightening torque columns.
Maximum tightening torques for US bolts. This chart displays values for lightly oiled threads. The tension is 70% of yield strength.
May 25, 2024 · To calculate the torque required to tighten a bolt: Determine bolt size — find the diameter and thread pitch of the bolt. Look up torque specification — use a torque chart specific to the bolt's size and material. Consider material strength — adjust for the bolt and mating material's strength.
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.
