# Determine applied force due to torque

I'm hoping for some clarification regarding converting torque to force at point of contact. I'm tightening some threaded components, the end faces of each are machined and will form a metal-metal seal under compression. I would like an idea of the force being applied at the interface due to a prescribed torque.

Using T = F.r (neglecting friction) the following values apply: T = 5N.m (setting of torque wrench) r = 0,0275 m (lever length of torque wrench)

I calculate F = 181,82 N but I think this force is referring to how hard my arm is pushing the wrench to achieve the desired torque.

Can anyone clarify this and suggest how I might go about finding the force at the interface?

Thanks in advance.

• That's a pretty short torque wrench you got there :P maybe a 0 too much behind the comma? Jan 13, 2021 at 12:28
• Arg! You're correct - I've mistyped! However, am I correct in thinking that I'm actually calcuating the force applied to the wrench rather than the force provided to the interface? ^_^ Jan 13, 2021 at 12:48

## 1 Answer

It sounds like you want the clamp force, or axial force applied by the screw threads based on your input torque (radial force x lever arm). Here's a useful calculator

• Thanks jko - I've used the calculator and found what seems to be reasonable answer! Jan 13, 2021 at 12:51