The only way to properly determine the
optimum tightening torque for a given application is to simulate the exact
application. This should be done with a tension indicating device like Torque
Wrench or Spanner. The widely recognized engineering formula is T= K x D x P
T=Target tighten torque
K= Coefficient of friction (nut factor / Slip Factor), always an estimation in this formula
D = Bolts nominal diameter
P = Clamp Load or Bolt's desired tensile load (generally 75% of yield strength)
Above Three factors affect how much
tension occurs when a given amount of tightening torque is applied. The first factor
is the bolt's diameter. Naturally M24 bolts take more force to tighten than M16
bolt. The second factor is the bolt's grade. It takes more force to stretch a
10.9 Grade bolt than it does to stretch an 8.8 Grade bolt because of the
greater material strength. The third factor is the coefficient of friction
often called as nut factor and it is always estimation.
K= Coefficient of friction (nut factor / Slip Factor), always an estimation in this formula
D = Bolts nominal diameter
P = Clamp Load or Bolt's desired tensile load (generally 75% of yield strength)
Above Three factors affect how much
tension occurs when a given amount of tightening torque is applied. The first factor
is the bolt's diameter. Naturally M24 bolts take more force to tighten than M16
bolt. The second factor is the bolt's grade. It takes more force to stretch a
10.9 Grade bolt than it does to stretch an 8.8 Grade bolt because of the
greater material strength. The third factor is the coefficient of friction
often called as nut factor and it is always estimation.
Keep in mind this is only an estimated
value. It may provide satisfactory performance, but it also may not. It is extremely important to realize that this tightening
value is valid only so long as all of the aspects of the application remain
constant. Don’t think if you are giving more torque means it is good for
structure / application, because during the torque operation bolt will be
stretched. If more stretched than required it may be broken. So each and every
application should be evaluated on its own to determine the optimum torque
value for each application. If you are not aware please refer the manufacturer
recommendations & Technical specification or use above formula with
contingency.
Co-Efficient of Friction / Slip factor or Nut Factor details will be followed my Next Post.
For More details about Torque Click Torque
Best Quote :"Never leave that till tomorrow which you can do
today". Have a Nice Day
For More details about Torque Click Torque
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CO-Efficient of Friction Tester | Packaging Testing Instruments | Peel Strength Tester
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