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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-23-2012, 08:48 PM   #1 (permalink)
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Cylinder base nuts?

The above are really expensive. Is there any reason you can't just use normal 3/8 unf nuts? Obviously they'll be high tensile, just wondering if there is anything unique that makes them worth the money?

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Old 11-23-2012, 09:12 PM   #2 (permalink)
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They are 12 point nuts. Early models used standard hex nuts. I believe they went to 12 pt so you could put a box wrench on them. You can only get an open end on the hex nuts due to a lack of clearance with the cylinder.

regards,
Rob
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Old 11-23-2012, 10:02 PM   #3 (permalink)
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Google-search "12 point nuts".Summit Racing offers a 10-pack ,chrome-moly with black-oxide finish,made by ARP.A little over $13 for 10,or about the same unit price for single nuts.You would need to zinc plate them,or use silver paint.
The also offer them to suit a 1/2" or7/16" wrench.You need 1/2" wrench size,and 3/8" x 24 tpi thread.
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Old 11-24-2012, 05:38 AM   #4 (permalink)
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So you need a crowfoot torque wrench or just whack them up?

May as well just whack some hex nuts on really as they are cheap! Unless the flanged 12 point ones are better for spreading load. Probably worrying about nothing really.

Problem with USA-UK is the postage! Damn Triumph bits mostly being in america Maybe I should move countries.
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Old 11-24-2012, 05:49 AM   #5 (permalink)
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You've hardly got room for a 1/2" ring spanner,even with the 12 point nuts.You still need to grind down the spanner.
You're only likely to use an open-end spanner with single-hex nuts.The chance of getting them tight enough is slim.
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Old 11-24-2012, 06:36 AM   #6 (permalink)
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I know I bought some recently thinking I just spent more than i should have on these things.
Mine weren't in horrible shape either, besides them not having that nice shiny coating.
I've been reading and rereading Snakeoil's thread "Zinc Plating at Home" and I'm sure I could've went that route for what I needed anyway.
(And I am getting ready to get everything I need to give his plating method a go too.)
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Old 11-24-2012, 07:00 AM   #7 (permalink)
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you might just about get away with reduced head nuts but to get them real tight i would stick with 12 point.
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Old 11-24-2012, 09:41 AM   #8 (permalink)
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http://www.thunderbirdspares.com/cyl...9-83-662-p.asp
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Old 11-24-2012, 09:41 AM   #9 (permalink)
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I just got some on ebay yesterday for $20, I guess that may be a little high for 8 nuts!

When I bought the bike someone had put acorn nuts on, I almost couldnt get the damn cylinder off.
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Old 11-24-2012, 02:37 PM   #10 (permalink)
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Ah yes, that makes sense now. Better go with the 12 point nuts...

Cheers Dave, that's solved the problem of overpriced nuts!

I guess using a torque wrench is out of the question then if you have to grind a spanner down! I have a very small headed torque wrench though - smaller than a socket. I could always grind a socket down.
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