Bolt tightening torque chart pdf Title: Metric Bolts, Screws & Nuts: Tightening Torques Author: Fastener Mart Created Date: 8/12/2006 10:22:23 PM 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. 6 2. The torque moment is calculated as a factor K multiplied by the bolt diameter and pretension. Grade 2, 5, and 8 values are for plated bolts. 8, 10. (Ffmax Torque ASTM A325 Open PDF. As stated above, there are a number of factors that affect tightening torque. There will be some variation during actual assembly so applying a tolerance to the installation torque spec is recommended. 9 8. 3 23.
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