Mm These formulae may be used for bolts outside the range of the tables overleaf. Lubricating the bolts is the suggested method. There is no torque difference for fine or coarse threads. Galling is a form of wear caused by adhesion between sliding surfaces. Remember you may need to vary these numbers somewhat based on the individual joint or the amount of fastener lubrication.
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Torques for bolts concept - Lubed means cleaned dry bolts lubricated with standard medium viscosity machine oil.
The Bolt Torque Table below provides information such as tension torque TPI for the heavy structured bolts against its corresponding bolt sizes ranging from 12 to 1 12. When a material galls some of it is pulled with the contacting surface especially if theres large amount of force compressing on the surfaces together. The proof load itself is usually 85 to 95 of a bolts yield strength but the clamp load is significant because it is what ultimately provides the clamping pressure. By failure the bolt is lubricated and tightened with the same torque 2022 Nm. The force acting in the lubricated bolt can be calculated as. The yield strength for strain-hardened bolts varies with diameter.
It is estimated that only about 10 of the tightening torque actually results in useful bolt tensioning. The torque required to achieve this force with a dry bolt is calculated to 2022 Nm. M P x D M torque Nm 5000 P bolt tension Newtons D bolt dia. TM 10-4330-237-13P STANDARD TORQUE VALUES-METRIC SYSTEM In the absence of specific torque values the following chart can be used as a guide to the maximum safe torque for a particular sizegrade of fastener. The remaining 90 is lost due various forms of friction that occur during the tightening process. Multiply Nm by 0737562 19 11 332 27 535 5 754 9 138 22 219 44 318 77 434 122 592 190 748 269.
This shows torque values in Nm for property classes 50 70 and 80 as shown in the table below. Mm Typical Maximum Tightening Torque Nm Property Class. Torque in Pound Foot or Pound Inch Torque in Newton Meter - Nm Lubed means cleaned dry bolts lubricated with standard medium viscosity machine oil. Lower Breakout Torques no galling. US Recommended Bolt Torque. RECOMMENDED ASSEMBLY TORQUES Class 88 ISO Metric Coarse Pitch Bolts Screws Bolt Tension Recommended Corresponding to Assembly 65 of Proof Load Torque kN Nm 048 015 078 031 128 064 To convert kN to lbf.
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