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Old 09-22-2013, 11:55 AM   #1
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axle mounting bolt torque

Is there a proper torque for axle mounting bolts? If I mount my new axles with a 1/2" air wrench that can go to about 400-450ft lbs, is that enough?

Also, I'm not sure the new axles will come with mounting hardware. Is grade 5 sufficient for this application, or do I need grade 8.
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Old 09-22-2013, 12:00 PM   #2
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Originally Posted by retrocar66 View Post
Is there a proper torque for axle mounting bolts? If I mount my new axles with a 1/2" air wrench that can go to about 400-450ft lbs, is that enough?

Also, I'm not sure the new axles will come with mounting hardware. Is grade 5 sufficient for this application, or do I need grade 8.
Grade 5 is OK, but grade 8 is far superior.

We have supplied the grade 8, for many years.

Andy
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Old 09-22-2013, 01:54 PM   #3
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There are tables on the Internet showing the torque specs for each grade of bolts. 450 ft pounds is way too much for a 5/8" bolt. Grade 8 bolts are recommended.
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Old 09-22-2013, 03:26 PM   #4
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Here's a chart on this page for torque specs for axle mounting, from Dexter.

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Old 09-22-2013, 03:47 PM   #5
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Definitely go grade 8
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Old 09-23-2013, 04:22 PM   #6
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Grade 8....Clean the mating surfaces. If you use lock washers use highest quality. Finish tighten with a breaker bar if you don't torque. Above all else check them at least once after a few miles.
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