Where to get Grade 8 bolts
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Road Captain
Joined: Oct 2010
Posts: 683
Likes: 3
From: Florida
+1 on bolt depot. They have everything Ive ever needed. Usually I go to Ace first, it they dont have it I go to Bolt Depot. Ive tried Home Depot, Lowes, and even a speciality bolt store and finally settled for the above 2 choices.
Ive done a nut and bolt full restoration on a 68 Triumph Bonnie using Ace and Bolt Depot for all my fastener needs (including 7+ inch engine mounting bolts in Stainless Steel.)
Ive done a nut and bolt full restoration on a 68 Triumph Bonnie using Ace and Bolt Depot for all my fastener needs (including 7+ inch engine mounting bolts in Stainless Steel.)
Tourer
Joined: Jun 2010
Posts: 282
Likes: 1
From: Raleigh, N. Carolina (Via Brighton, England)
Tourer
Joined: Jun 2010
Posts: 282
Likes: 1
From: Raleigh, N. Carolina (Via Brighton, England)
These guys are in England and have every nut and bolt in stainless steel for just about all vintage British bikes. Theyve even custom made some bolts for me:
http://www.manx.co.uk/index.htm
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Road Captain
Joined: Oct 2010
Posts: 683
Likes: 3
From: Florida
Engineer Input
Well I talked with a structual engineer on the bolt grade thing and my Dyna motor mount scenario. He told me he could not comment on it professionally without cad specs of load and angles etc.
But he said off the record from the info I gave him a grade 5 would probably be sufficient, but if possible go with equal grade of the OEM (grade 8)
But also he brought up (and questioned me on) an aspect besides the Tensile strength ratings that I was inquiring about. That is torque ratings. He asked me what the OEM torque was on the bolt. He said that beside tensile and axial loads, bolts have to qualify in the torque strength range. He said
the recommended torque specs on said bolts were
3/8" dia. 16 tpi = 15 to 17lbs @ grade 2 (grade for many stainless)
" " = 23 to 26lbs @ grade 5
" " = 33 to 37lbs @ grade 8
--As you all know the HD torque spec for the front isolator mount is 21lbs min.
He also said that torque failures (depending on variables) usually occur anywhere from 22lbs to 35lbs over recommended torque, which agrees with scenarios I have experienced myself when accidentally over torqing something. (yea once a long time ago I grabbed the ft lb wrench for an inch lb rating, I had a case of stupid that day, always double check which wrench now)
Just thought I would share that.
But he said off the record from the info I gave him a grade 5 would probably be sufficient, but if possible go with equal grade of the OEM (grade 8)
But also he brought up (and questioned me on) an aspect besides the Tensile strength ratings that I was inquiring about. That is torque ratings. He asked me what the OEM torque was on the bolt. He said that beside tensile and axial loads, bolts have to qualify in the torque strength range. He said
the recommended torque specs on said bolts were
3/8" dia. 16 tpi = 15 to 17lbs @ grade 2 (grade for many stainless)
" " = 23 to 26lbs @ grade 5
" " = 33 to 37lbs @ grade 8
--As you all know the HD torque spec for the front isolator mount is 21lbs min.
He also said that torque failures (depending on variables) usually occur anywhere from 22lbs to 35lbs over recommended torque, which agrees with scenarios I have experienced myself when accidentally over torqing something. (yea once a long time ago I grabbed the ft lb wrench for an inch lb rating, I had a case of stupid that day, always double check which wrench now)
Just thought I would share that.
Last edited by R_W_B; Nov 24, 2010 at 09:32 AM.
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