I used M10 I'm trying to calculate the clamping force resulting from torquing a nut and bolt to a particular level. Yvon — I believe you are correct, the torque would not need to be decreased because of the lockwasher. Would the coefficient for a lubricated hot dip galvanized bolt be 0. The appropriate torque value to use in a specific application is best obtained by using a calibrated torque wrench and a Skidmore-Wilhelm load indicating device to equate actual torque to the desired tension. Besides the library of information available on our website, you can also find technical information through the Industrial Fasteners Institute. Asmita- Torque is a tricky subject, and there are many variables that can come into play. Dan — I am sorry, but I am not sure where you could find bolts like that, other than having them specially made.
See Torque Force Design Equations webpage and torque chart page for recommended fastener torque and equation data. This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. 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.
That figure is about right for a low tensile bolt. Some methods involve calculating clamping force by tightening the bolt by a predetermined.
Hopefully, this short introduction to bolt connections helps address some of the confusion surrounding this issue. Jeremy — It would all depend on the application. Variations are common, although yours seems excessive. These days, people just specify over and above what is required without any engineering!
Bolt Preload Tension Force Equation Calculator Engineers Edge
The result seems way too high. Then specify a bolt size.
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Or is it that the majority of torque is absorbed by friction which is proportional to clamping force and not reaction force from the thread ramp? Question feed. That figure is about right for a low tensile bolt. Jared — These torque charts are calculated for use in steel to steel connections. It will depend on the capacity of the bolt in question, what you are bolting, and the amount of friction in the bolted assembly.
This is can be dependent on a number of factors, but is largely a. Tightening torque values are calculated from the formula. T = KDP, where T bolt.
Bolt Torque Calculator
Clamp load (lb.) is calculated by arbitrarily assuming usable bolt strength is. Products · Custom Sensors · Load Cells · Torque Sensors · Force Sensors · Pressure Sensors · Multi Axis · Instruments · Accessories · USB Sensors.
This question is a bit off the beaten path. The values we used when calculating our values are: 0. Poor method to get a known clamping force; frictions are large unknowns. Torque values determined from tables or from equations that claim to relate torque to pretension without verification shall not be used.
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See Estimated Torque Values.
Video: Bolt clamp force calc Friction Factors - Fastening Theory Part 2
Try our free and simple bolt load calculator to approximate your bolt stress at installation. On the go? Download our Bolt Load Calculator app instead. This amount of tightening, a rule of thumb, is suitable for many joints, but in some cases, external tensile loads can reduce bolt clamping force.
See Estimated Torque Values. Until we dont have the format.
Do you know where I could find some? There is no such thing as an overtightened connection, until you break the bolt in tension.
Force Calculations for Bolted Joints Machine Design
Original gasket was Grade 1 65 durometer rubber. The primary influence on torque calculations is coefficient of friction. For ordinary applications like car wheel lugs or headboltsthe manufacturer has the experience to know the torque levels to apply.