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Old 08-19-2008, 06:58 AM
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Balancer bolt from bolt supply store??

As I've mentioned in another thread, I need a longer-than-stock balancer bolt for my 350 SBC due to damaged threads at the front of the crank snout. I was all set to order an expensive ARP balancer bolt, which is 2.47" long (compared to the 2.25" stock bolt), but then decided to see if I could get a 'generic' bolt of the correct specs from a specialist bolt supply store. Amazingly, I can get a suitable bolt from them for only $3.50 + shipping! This price seems so low, I want to make sure of the specs. Can you guys confirm this is suitable?

7/16" UNF
20 TPI
5/16" stud head
Zinc plated
High Tensile metric Grade 10.9 (equiv to Grade 8)

Thanks.

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Old 08-19-2008, 07:37 AM
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Quote:
Originally Posted by v8hed
Amazingly, I can get a suitable bolt from them for only $3.50 + shipping! This price seems so low, I want to make sure of the specs. Can you guys confirm this is suitable?

7/16" UNF
20 TPI
5/16" stud head
Zinc plated
High Tensile metric Grade 10.9 (equiv to Grade 8)

Thanks.
Buy it if you are satisfied with the price! It will be fine and plenty strong enough.

If that is $3.50 in US dollars it seems to be high priced, even for a grade 8 zinc plated hex head bolt. I guess it may be a "special" order for you in the UK though since you use the metric system.
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Old 08-19-2008, 08:11 AM
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What is a "stud head" bolt?

Just for clarification, what is a 5/16 "stud head" bolt on a 7/16-20 UNF thread? On your side of the pond is that the same as a socket head in the US? BTW, have you got your balancer all the way on yet?
Just curious,
TR
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Old 08-19-2008, 08:17 AM
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Quote:
Originally Posted by 540z
Just for clarification, what is a 5/16 "stud head" bolt on a 7/16-20 UNF thread? On your side of the pond is that the same as a socket head in the US? BTW, have you got your balancer all the way on yet?
Just curious,
TR
Excuse my gaffed attempt at trying to translate into American English... it's what we call a 'socket cap' bolt.

Yes, the balancer is all the way on. I mocked-up the crank pulley and mocked-up the alt. belt between the water pump pulley and the crank pulley and it ran in a straight line between the two.
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Old 08-19-2008, 08:43 AM
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How long is this new bolt? How deep are the threads on the crank snout?
Personally, I'd use a hex head bolt as opposed to a socket cap. I'd prefer to use a 5/8" socket wrench over a 5/16" hex key any day, especially if you are rotating the engine with it. I've rounded off too many socket heads in my day.
Just my 2 cents.
TR
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Old 08-19-2008, 06:37 PM
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Quote:
Originally Posted by 540z
How long is this new bolt? How deep are the threads on the crank snout?
Personally, I'd use a hex head bolt as opposed to a socket cap. I'd prefer to use a 5/8" socket wrench over a 5/16" hex key any day, especially if you are rotating the engine with it. I've rounded off too many socket heads in my day.
Just my 2 cents.
TR
Hmm, yea, I might just get the ARP bolt... it's sooo expensive though (around $30 over here). Length is 2.47" under the bolt head, compared to 2.25" stock. The face of my new balancer protrudes (without actually measuring it) ~0.75-1.00" beyond the crank snout. I'm ASSUMING that a 2.47" bolt will be OK without bottoming-out. By the way, what is actually at the 'bottom' of the crank snout? Just a solid iron wall?
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Old 08-20-2008, 05:30 AM
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Send me a PM. Let's get this worked out.
TR
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Old 08-20-2008, 06:24 AM
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What he said is correct. I would use a hex head cap screw or bolt over a socket head cap screw or bolt also. They should be available from the same place you can get the socket one. Just use grade 8 and you will be fine.If you can't find one PM me and I will send you one.
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Old 08-20-2008, 06:26 AM
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Quote:
Originally Posted by v8hed
Hmm, yea, I might just get the ARP bolt... it's sooo expensive though (around $30 over here). Length is 2.47" under the bolt head, compared to 2.25" stock. The face of my new balancer protrudes (without actually measuring it) ~0.75-1.00" beyond the crank snout. I'm ASSUMING that a 2.47" bolt will be OK without bottoming-out. By the way, what is actually at the 'bottom' of the crank snout? Just a solid iron wall?
Yes ,just solid iron.
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