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Bolt Property/Class

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Old 10-30-2009, 11:28 AM
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Default Bolt Property/Class

Gents - How do you determine if a bolt is a class 8.8, 10.9, etc.? I'm installing a lift tomorrow and want to ensure I torque to the proper settings (i.e. a 12MM bolt is torqued to 55ft/lbs if it's class 8.8, but 75ft/lbs if it's a 10.9).

Thanks!
Old 10-30-2009, 11:37 AM
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See if this will help.

http://www.americanfastener.com/technical/grade_markings_steel.asp
Old 10-30-2009, 11:39 AM
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Unfortunately, if the bolts were made in China then it will not really matter. I'd go on the low side if I were you, before they start snapping. But to answer your question, the code should be on the head, and very clearly read. Otherwise it is a fake.
Old 10-30-2009, 11:59 AM
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Originally Posted by Smelt_1
Unfortunately, if the bolts were made in China then it will not really matter. I'd go on the low side if I were you, before they start snapping. But to answer your question, the code should be on the head, and very clearly read. Otherwise it is a fake.
Yup
Old 10-30-2009, 01:24 PM
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Follow this write up for torque settings and you should be good.


http://project-jk.com/wp-gallery2.php?g2_itemId=117479
Old 10-30-2009, 02:08 PM
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Much appreciated insight, guys - just what I was looking for. Plus, that torque-setting write-up is the cat's pajamas!
Old 10-31-2009, 03:56 AM
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This cat don't wear no jamies...
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