Torque in bolts
Torque in bolts
(OP)
Hi,
I would like to know what torque apply to bolts in general. Machinery handbook suggest 75-90 % of yield strength, but what is the best 75 ? 80 ? 90 ? Is it too dangerous to use 90% of yield ?
thx
Simon P.
I would like to know what torque apply to bolts in general. Machinery handbook suggest 75-90 % of yield strength, but what is the best 75 ? 80 ? 90 ? Is it too dangerous to use 90% of yield ?
thx
Simon P.





RE: Torque in bolts
It really depends on your application.
Have a look at this site:-
h
desertfox
RE: Torque in bolts
RE: Torque in bolts
Nut factors have an important influence in the relation Torque/preload but it is really hard to have a good precision on this factor because it depends on coeficients of friction between threads and between surfaces.
Does someone know a good reference for this factor ?
THX
RE: Torque in bolts
RE: Torque in bolts
If you're lucky, the book may identify the components and test method used. That's really not much help though, as it doesn't tell you anything about your application.
If you need to be certain of your preload, and you are using torque control, then you should test your components in your application and derive a k factor for your joint.
If you need to be certain of your preload, you shouldn't be using torque control.