US Hex Bolts - Inches - ANSI/ASME B18.2.1 Dimensions of Hex Bolts - Imperial units.US Bolts - Tightening Torques - Recommended bolt torques.US Bolts - Tensile Strength and Proof Loads - Tensile strength and proof loads SAE bolts.Threaded Rods - Proof Loads in Metric Units - Proof load capacities of metric threaded steel rods.Threaded Rods - Loads in Imperial Units - Weight rating of threaded hanger rods.Threaded Bolt Stress Area - Threaded bolts tensile stress area.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. 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
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