Dear all

I need to calculate the tightening torque for the metal(brass) thread insert in the plastic base material.

Is there any empherical relation avail?

M6 metal thread insert /10mm length in the plastic material.I asked to recommend the thread tightening torque..

I found relation refering one book (3.14*d^2)/2 *len*Shear stress of the plastic matl.

Shear stress recommendation 0.5 x Tensile strength(115n/mm^2-actual value got from testing) given in the same ref.book

I found that it is near to steel shear sress..i hope data given is wrong...

I think this torque is the maximum at which failure?

So i have to recommend less than this torque.

Result of the tightening torque found high...

I need suggestions & materials...

Prakash ■