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Old 03-11-2010, 09:39 AM
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Hex Bolts VS. 12 Point Bolts

Hey guys,

I'm looking to but and ARP engine bolt set and they sell two differect versions one with hex bolts and one with 12 point bolts. Which is the better one to go with? What are the pros and cons? thanks

Dave
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Old 03-11-2010, 09:46 AM
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12-point bolts require 12-point sockets and wrenches, and there is no way to tighten a 12-point bolt with an open end wrench, such as sometimes needed with header or intake manifold bolts.

I prefer the 6-point Stainless myself, black oxide sucks and will rust within a year if not in a climate controlled garage.
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Old 03-12-2010, 02:22 PM
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Nova's right about the wrench accessability but if its a structure bolt of some kind that you gotta put some torque on a twelve point will hold an edge better and be less likely to round off.
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Old 03-12-2010, 05:26 PM
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One thing I like about the 12-point set's head bolts are that if you are going to retorque them you won't need to remove any rockers. I also feel that the 12-point socket puts a better grip on the fastener.
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Old 03-16-2010, 08:23 AM
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Quote:
Originally Posted by daveh
Hey guys,

I'm looking to but and ARP engine bolt set and they sell two differect versions one with hex bolts and one with 12 point bolts. Which is the better one to go with? What are the pros and cons? thanks

Dave
Isn't 12 point going to be hard to always find the wrenches for? I mean, you may not be the only one to touch it, though I may be just having a blond moment too...
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Old 03-18-2010, 12:18 AM
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12 points are typically used in tight clearance locations such as header flanges where the larger head of a hex head bolt either wouldn't clear, or would only be capable of tightening via an open end wrench. I've run into a lot of 12 points over the years in working on heavy equipment, and I've never seen one of them round off when trying to remove it if it happens to be unusually tight. Wish I could say the same for hex heads, cause I'd have lots less scars on my mitts

One thing worth checking is whether the bearing diameter on the 12 pts is the same as the corresponding dia on a standard hex bolt. I've seen some tight clearance 12 pts whose bearing dia is definitely smaller than that of the same size hex head, and the use of those bolts wouldn't be advisable on any location where the hole has a large amount of clearance. ARP makes lots of slick stuff and a lot of fasteners that don't necessarily just follow industry standards for dimensions, so it could well be that the 12 pts are made with bearing flanges equal to those of hex heads, but its definitely something worth verifying since they sure don't give all them neat bolts away for free.
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