Strostkovy
Titanium
- Joined
- Oct 29, 2017
I'm assembling a project and just got a torque wrench set (Tekton. Not great, not terrible), and set my 1/4" one to 17Nm (from charts online) for an M6 10.9 hex bolt with 16mm of thread engagement into a 3/4" aluminum plate with freshly tapped, oil free threads.
I had accidentally been tightening the handle, and when the bolt snapped I saw my wrench was up to 20.5Nm. It seems odd to me that not even 20% more torque was enough to snap the bolt. I will say even 17Nm feels tighter than I would go with a wrench. Luckily the threads were totally fine and it was a through hole so I just used a drill to thread the stub out the back.
I know that the actual bolt tension depends on a lot of factors, including material. Is there a better chart or calculation to determine what my torque values should be?
I had accidentally been tightening the handle, and when the bolt snapped I saw my wrench was up to 20.5Nm. It seems odd to me that not even 20% more torque was enough to snap the bolt. I will say even 17Nm feels tighter than I would go with a wrench. Luckily the threads were totally fine and it was a through hole so I just used a drill to thread the stub out the back.
I know that the actual bolt tension depends on a lot of factors, including material. Is there a better chart or calculation to determine what my torque values should be?