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Reduced Torque with Lubricated Bolts - Lubrication effect on bolt tension and torque.Metric Nuts - Proof Loads - Proof loads of metric nuts - coarse and fine threads.Metric Bolts - Tightening Torques - Typical maximum recommended thightening torques for metric bolts.Metric Bolts - Minimum Ultimate Tensile and Proof Loads - Minimum ultimate tensile and proof loads for metric bolts with coarse or fine threads.Improvised Torque Wrench - Improvise a torque wrench with a luggage scale.Bolt Stretching and Tensile Stress - Tensile stress and Hooke's Law.Fasteners - Bolts, nuts and threaded rods - torque, tension and loads.This calculator can be used to calculate the force acting in a bolt. This is way above what the bolt can handle and fatal failure is likely. The force acting in the lubricated bolt can be calculated asį lubricated = (2022 Nm) / (0.2 (0.03 m) (1 - (40%) / (100%))) The torque required to achieve this force with a dry bolt is calculated to 2022 Nm.īy failure the bolt is lubricated and tightened with the same torque 2022 Nm. The proof load for a M30 metric bolt grad 8.8 is 337000 N. 1 can be rearranged to express bolt force asį = T / (K d (1 - l / 100)) (1a) Example - Dry vs. Lubricating the bolt with SAE 30 oil reduces the torque required to achieve the same tension with approximately 40%. The torque required to achieve this tension with a dry bolt with 0% lubrication can be calculated as The torque required for a 3/4" dry steel bolt with 0% lubrication to achieve this tension can be calculated as The required bolt clamping force for a joint is 20000 lbs. Make a Shortcut to this Calculator on Your Home Screen?Įxample - Required torque for tightening a Imperial bolt.US Bolts - Tensile Strength and Proof Loads.Metric Bolts - Minimum Ultimate Tensile and Proof Loads.Note that standard dry torques are normally calculated to produce a tensile stress - or axial force or clamp load - in the bolt that equals to 70% of minimum tensile strength or 75% of proof strength. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent.
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The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. Typical metric and imperial bolyt torques Bolt Torque Calculator In addition the accuracy of a torque wrench is normally no better than +-25%. Manufacturing data should always be checked before use. Typical Metric and Imperial bolt torques are indicated in the links below: Note! - be aware that this is a rough calculation where the screw pitch is not included. Typical values for K with mild-steel bolts in range 1/4" to 1": K = constant that depends on the bolt material and size The relation between applied torque and axial force - or load - in a bolt can be calculated in this general equation as