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how to calculate bolt tightening torque

How to calculate bolt tightening torque. By applying tightening torque, we are basically stretching the bolt. which in turns creates a tensile stress in the bolt. The tensile load developed in the bolt due to tightening torque is known as preload. The tensile load in the bolt, creates a compressive force in the bolted joint. which is often known as clamping force. When we apply tightening torque to a bolt, it seems that all applied torque converts into preload. But unfortunately only 10% of the applied torque convert into useful preload. And about 50% of the applied torque is used to counter, frictional resistance between the nut and the washer or nut and joint. And remaining 40% of the applied torque is used to counter frictional restraint between threads of nut and bolt. The tightening torque also depends on the nut factor K. The value of nut factor depends on Fastener Materials, type of Coatings and lubricant. if we load the bolt up to its yield point. Than bolt will have permanent deformation and it cannot be used again. So in case of fasteners we define a term proof strength or proof load. Proof strength can be defined as the maximum tensile stress that can be applied to a bolt, which will not result in plastic deformation. In other words, the material must remain in its elastic region when loaded up to its proof strength. Proof strength is typically between 85 to 95% of the yield strength. In case of non-permanent bolted joint, where we want to reuse bolts. In such applications bolt should be loaded up to 75% of its proof strength, this is to avoid permanent deformation in bolt. So for non-permanent bolted joint preload can be calculated as 0.75 times proof strength multiplied by bolt stress area. And if the bolted joint is permanent, then we can load the bolt up to 90% of its proof strength. Therefore, in case of permanent bolted joint preload can be calculated as 0.90 times proof strength multiplied by bolt stress area. Some of queries answered in this video are how to calculate bolt tightening torque 0:29 to 4:30 how to calculate tightening torque of a bolt torque calculation for bolts how to calculate tightening torque of a screw how to calculate tightening torque for bolts torque calculation for fasteners tightening torque calculation for bolts fastener torque calculation bolt torque calculation bolt tightening torque calculation 0:29 to 4:30 How to calculate bolt torque tightening torque calculation for fastener bolt tightening torque bolt tightening torque calculation bolt tightening bolt tightening torque formula bolt tightening sequence bolt torque bolt torque chart bolt torque calculation formula screw torque screw tightening #bolt tightening torque calculation #bolt tightening torque #bolt torque calculation you may also like to watch following videos Bolt grade explained watch this-    • Bolt grade explained   screw thread terminology and bolt specification explained watch this-    • types of screw threads and screw thre...   proof load and offset yield strength watch this    • Proof Load and Yield Strength explained   coarse pitch vs fine pitch screw threads. A guide for screw pitch selection watch this -   • How to Choose the Right Screw Pitch: ...   application of specicific speed watch this-    • Unlocking Pump Efficiency: A Comprehe...   pump cavitation and net positive suction head watch this-    • pump cavitation and net positive suct...   How to select pump speed: A complete guide as per Hydraulic Institute standards watch this-    • Unlock Maximum Efficiency: Mastering ...   Download spredsheed for tightening torque https://docs.google.com/spreadsheets/...