Question

In: Mechanical Engineering

Calculate the torque requirements for SAE 5.8 Class Bolt having a size of M24 x 3...

Calculate the torque requirements for SAE 5.8 Class Bolt having a size of M24 x 3 UNC

Solutions

Expert Solution

The target torque of a bolt

T = k* D * P

Where

  • T - Target tighten torque (the result of this formula is in inch pounds, dividing by 12 yields foot pounds
  • K- Coefficient of friction (nut factor), always an estimation in this formula
  • D- Bolts nominal diameter in inches
  • P - Bolt's desired tensile load in pounds (generally 75% of yield strength)

K = 0.2

K factor in this formula is always an estimate. The most commonly used bolting K factors arc 0.20 for plain finished bolts, 0.22 for zinc plated bolts, and 0.10 for waxed or highly lubricated bolts.

D = 24 mm = 0.024m

Yield strength = 420 Mpa = F/A

Area = (0.024/2)2 = 0.0004524

F = 4.2x108 * 0.0004524 = 190003.524 N

P = 0.75* 190003.524 = 142502.643 N

T = 0.2*0.024*142502.643 = 684.01Nm ( max allowed torque)


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