welding precautions
Logistics Pro
Joined: Sep 2007
Posts: 3,737
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From: Western Mass
ROCKCRAWLER.com - Grade 5 vs. Grade 8 Fasteners
If you're torquing a 1/2-13 grade 8 bolt to 150 foot lbs, its likely overtightened and failing because of that. I have a print out of the chart in the following link and have used it without and problem so far. Note the difference between plain, plated, and waxed (oiled?) bolts.
Proper Bolt Torque - by Zero Fasteners
Elder User
Joined: Mar 2008
Posts: 912
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From: Marianna, Florida USA
Read the link below, grade 8 is ALWAYS better than grade 5. However, the engineers at the auto companies build to a specified strength, no more as any extra would cost more (even a few pennies adds up over thousands of vehicles).
ROCKCRAWLER.com - Grade 5 vs. Grade 8 Fasteners
If you're torquing a 1/2-13 grade 8 bolt to 150 foot lbs, its likely overtightened and failing because of that. I have a print out of the chart in the following link and have used it without and problem so far. Note the difference between plain, plated, and waxed (oiled?) bolts.
Proper Bolt Torque - by Zero Fasteners
ROCKCRAWLER.com - Grade 5 vs. Grade 8 Fasteners
If you're torquing a 1/2-13 grade 8 bolt to 150 foot lbs, its likely overtightened and failing because of that. I have a print out of the chart in the following link and have used it without and problem so far. Note the difference between plain, plated, and waxed (oiled?) bolts.
Proper Bolt Torque - by Zero Fasteners
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