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I usually go off this chart:
www.engineeringtoolbox.com
I usually go off this chart:
Metric Bolts - Tightening Torques
Recommended thightening torque metric bolts.
www.engineeringtoolbox.com
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Well, it's been proven over and over again that expert pro mechanics will over-tighten small fasteners and under-tighten big bolts when going "by feel". Even after decades of experience they can't get better than +/-10%. We don't aim rockets "by eye", but rely on instruments with much, much more precision than our senses allow.
Beginners would learn "the feel" fastest with some sort of objective quantitative feedback. Clicker type wrenches aren't good for low-torque since they don't really click. They just kinda "clunk" and give and break gently. Newbies may miss this signal and continue to tighten. Personally I prefer to use beam-style wrenches or electronic torque meters with actual numbers for feedback.
These are actually better for high-torque applications too. Such as head-bolts, main bearing-caps and axle-nuts which has issue with "torque creep" due to extra friction at high torques. When you reach desired torque, it will actually relax a bit and you can continue to turn and torque won't increase for several degrees. Keep on turning gently and finally... the needle will nudge up tiny bit.. ah done! Clicker type wrenches would have clicked when target torque is first reached, but will end up under-tightening.
Beginners would learn "the feel" fastest with some sort of objective quantitative feedback. Clicker type wrenches aren't good for low-torque since they don't really click. They just kinda "clunk" and give and break gently. Newbies may miss this signal and continue to tighten. Personally I prefer to use beam-style wrenches or electronic torque meters with actual numbers for feedback.
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These are actually better for high-torque applications too. Such as head-bolts, main bearing-caps and axle-nuts which has issue with "torque creep" due to extra friction at high torques. When you reach desired torque, it will actually relax a bit and you can continue to turn and torque won't increase for several degrees. Keep on turning gently and finally... the needle will nudge up tiny bit.. ah done! Clicker type wrenches would have clicked when target torque is first reached, but will end up under-tightening.
1 - 2 of 9 Posts
