View Single Post
Old 02-03-2016, 01:27 PM   #5
rich weyand
Registered User
 
rich weyand's Avatar
 
Join Date: Apr 2014
Location: Bloomington Indiana
Posts: 1,041
Re: What is the grade of steering box mounting bolts?

The issue with using grade 5 and grade 8 bolts is one of torque specs. You need to torque bolts to where they deform a bit in order for them to stay tight. To do that with grade 5 and especially grade 8 bolts requires that they be torqued much more.

From this chart, a 7/16-14 (which is 7/16 NC) in grade 2 takes 24 ftlbs, in grade 5 takes 37 ftlbs, and in grade 8 takes 52 ftlbs of torque to be considered torqued up. The question then is, what kind of threads are you torquing it into, and can they take that?

It's not just a simple issue of "more is better".

https://www.boltdepot.com/fastener-i...ed-Torque.aspx
__________________
Rich Weyand

1978 K10 RCSB DD.
rich weyand is offline   Reply With Quote