Posted by Pau; on September 24, 2000 at 12:18:25:
In Reply to: Grade 5 or Grade 8?? posted by Tex on September 22, 2000 at 08:35:50:
{{I've heard that in general all automotive bolts (except maybe bumber bolts) are grade 5, and that GRADE 8 bolts are refered to as tractor bolts. }}
Grade 8 bolts are generally used in aircraft. This is required as a bolt failure at 10,000 feet can be most distressing. Seriously, grade 5 bolts (three dots or hashes) are fine for most things on a truck. The higher sheer resistance is needed on things that get jerked but grade 8 (5 dots or hashes) will work but cost more money than you need to spend.