Product Manager Seeking Bolt Clamping Force Help
Hello all,
First, I'm a PM working with contract designers/engineers, so please excuse my ignorant questions
I'm in the sporting goods field and working on a handlebar clamp system in which I have a concern with and looking for help.
My question is how can I verify if a metric M6x1 bolt will have greater clamping force compared to a M5x.8 bolt at a given torque value of 5Nm> Both being zinc-coated steel and threading into aluminum.
Issue is the current clamp system uses metric M5x.8 zinc-coated bolts, which is allowing the bar to slip/rotate. I've modified a version to use larger M6 bolts, which have improved clamping force at the same torque. My problem is confirming this mathematically.
I've tried to calculate axial bolt clamp force but am not able to asses the results. Bolt Details:
M6x1 Maj Dia= 5.974mm, Coe Friction value of .18 for dry thread zinc coating, 44.25in-lb torque, Yields 41.17 axial clamp force.
M5x.8 bolt Maj Dia=4.97mm, Coe Friction same at .18, same torque of 44.25in-lb/5N. Yields 49.46 axial clamp force
From this can I conclude the M5x.8 yields greater clamping force??