scudderfish
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| posted on 28/6/09 at 08:39 PM |
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What imperial thread is almost M8?
I've got an offenhauser 360 manifold with 4 threaded studs to hold the carb down. I can hand turn an M8 nut onto them for a couple of turns
before it binds up. I assume as it is a US manifold, it's an imperial thread, but which one?
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adithorp
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| posted on 28/6/09 at 08:42 PM |
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5/16 unf
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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v8kid
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| posted on 28/6/09 at 08:44 PM |
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5/16 UNC
Oops stand corrected just read it properly it will be UNF where the nuts go and UNC where the studs go into the ally
[Edited on 28-6-09 by v8kid]
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g.gilo
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| posted on 28/6/09 at 08:44 PM |
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thread
hi
almost certainly 5/16 unf if american.
graham
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g.gilo
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| posted on 28/6/09 at 08:44 PM |
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thread
hi
almost certainly 5/16 unf if american.
graham
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scudderfish
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| posted on 28/6/09 at 08:47 PM |
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Thanks all 
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clairetoo
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| posted on 28/6/09 at 09:43 PM |
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Sounds like UNC if an M8 will start on the stud - UNF is very fine and wont .
Its cuz I is blond , innit
Claire xx
Will weld for food......
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owelly
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| posted on 28/6/09 at 11:32 PM |
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It's 5/16", that we know! Just count how many TPI and we can tell you exactly! I would say UNC.
http://www.ppcmag.co.uk
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scudderfish
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| posted on 29/6/09 at 11:16 AM |
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For the sake of a couple of quid I've bought both UNC and UNF from eBay. I'll post up which ones actually fit
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wilkingj
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| posted on 29/6/09 at 02:45 PM |
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The thread in the ally body will almost certainly be UNC.
You usually have a coarse thread in the ally body to give max strength.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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jacko
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| posted on 30/6/09 at 09:02 PM |
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UNC
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scudderfish
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| posted on 2/7/09 at 08:14 AM |
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And the winner is......
UNF
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02GF74
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| posted on 2/7/09 at 12:30 PM |
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UNC will be closest to standed M8.
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Alan B
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| posted on 3/7/09 at 02:51 PM |
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M8 std pitch is 1.25mm
5/16 UNF pitch is 1/24" or 1.058mm
5/16 UNC pitch is 1/18" or 1.411mm
Therefore UNC is closer, but only slightly.
IMO it could be either...quite possibly the studs are coarse where they screw into the ali and fine for the nuts...that can happen.
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