| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,049 Posts1,055,546 Members48,425 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | |
| | | by bigedpa | | bigedpa |
Taking apart the frame on my 46 1/2 ton pickup I’ve noticed a lot of the bolts are fine thread. Is there a particular reason for this? A few of the parts include welded nuts so I guess I’ll have to case them down as my supply is all coarse thread. For the application where Nut and bolt are used does it make a difference if I replace with coarse threaded bolts?
Just wondering if there’s a critical reason for this.
| | |
| | | by klhansen | | klhansen |
Many times, fine thread bolts are Grade 8 versus Grade 5, although Grade 5 are also available in fine thread.
Frame bolts would also likely be Grade 8 for strength in critical areas. I would be reluctant to replace a fine thread bolt with a Grade 5 coarse thread. Unless you can be sure, I would treat all coarse thread bolts as Grade 5.
Check to see if there are head markings on the bolts you remove to determine the the grade.
| | 1 member likes this | | |
|
| |
