1/2" Grade 8 bolt question. - Fiberglass RV


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Old 04-13-2008, 03:18 PM   #1
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Is a 1/2' Grade 8 bolt, strong enough to bolt a dexter axle bracket to a 13' Scamp trailer?

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Old 04-13-2008, 04:20 PM   #2
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It might be too 'strong'. As the hardness and grade go up, so does the brittleness (you wouldn't want a very hard diamond bolt in there, would you?). Most receiver hitch manf supply and specify Grade 5 bolts. Dexter does spec the torque for your kit's 1/2" at 70-90 ft-lbs.

http://dexteraxle.com/i/u/1080235/f/6-8K%2...0-05_80_res.pdf

It might be a moot point, however, as I think the correct hardware comes with the A/P -165 hanger kit. You could call Dexter to be sure about that. Give us some feedback.
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Old 04-13-2008, 04:45 PM   #3
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Looks like grade 8 -------Dexter axle says 70-90 ft lbs grade 8 = 92 ft lbs grade 5 = 60 ft lbs
http://www.angelfire.com/fl4/pontiacdude428/Bolt.html
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Old 04-13-2008, 05:49 PM   #4
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Table says those are minimum torques, so the either is still possible, but I would lean towards the G-5, because Dexter's 70-90 is slightly below Table minimum of 92 for G-8.

Good table; I didn't know that socket head cap screws are even harder than G-8 and the reduction factors for lubes is useful.
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Old 04-13-2008, 10:34 PM   #5
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Good point,I think I will go with the Grade 5 Bolts.
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Old 04-13-2008, 11:19 PM   #6
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Just go with whatever Dexter puts in the bracket kit!
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Old 04-16-2008, 08:03 PM   #7
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Grade 8 is fine, not too brittle.
Before they went metric, you'd see grade 8 bolts all over CAT equipment.
(now they're usually metric 10.9 grade)
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