Quote:
Originally Posted by GCncsuHD
Dave, when all else fails, you can usually go by a chart according to the size of the bolt and the bolt material. The exception being when threading into something softer like aluminum, or TTY bolts etc.
Here is one you can go by, note that the max torque is 54 ft lbs for a 7/16 bolt like that in grade 5, and that is a dry torque. Any anti seize or oil used would reduce that to roughly 40.
http://www.engineershandbook.com/Tables/torque.htm
Of course if you can first get proper information like that 30 ft lbs for the bolt as spec'd by GM, go by that. |
That's a very handy site. I actually have their chart saved on my computer, printed out & posted in my home garage.
It should also be noted also that torque specs can deviate a tad according to the bolts fit class: 1A is loose, 2A is normal to most of our trucks fasteners and 3A is for where very tight tolerances are needed.
As GCncsuHD mentions, he material the bolt is made of has a huge difference too, as seen in the second screen shot from
Engineers Edge.
Very good thread you have started for us Dave! Thanks! 