SOHC.co.uk Forums > CB500/550
New frame/engine bolts. What type?
Oddjob:
You can get all the bolts and nuts from Middletons, and with the correct size heads as well.
I got Middleton to make me the top and bottom long ones back in the 80s but they don't do that anymore unfortunately.
Shame Max isn't a member anymore as those 2 long bolts would have been something he should have been able to make, bottom one especially as it's just a rod threaded both ends, nothing special there.
alexdecker:
Could I perhaps do this set then? Then I would only need to figure out a solution for the long bolts to make it a complete set, right?
https://www.ebay.de/itm/266394764819?hash=item3e065d8613:g:adsAAOSwBRVh3sTX&amdata=enc%3AAQAIAAAA0By6bS01FdHCVno0vdg0BcJB9TxUcImfxSwXHyG167zlwZEXi0C6haCGxIDhtuNZP5quonAszdAbRPysYRXAxCoBPvhC5b2eqHgx1e8aNaW82Q1FEhTVQ49%2Bd8OPHZIYkNNTNaFxh2asjNwIr7G5Cgpd6bSB8psYKpGScl4hQWJ3n8gDmwuc3tYFg4Z1XjSKI6HmBkPOtH2IeAQ0Na1BOoeS1dSJevGt87Ex9MfhyjkYhZkHyxvn89s5byMFGOROaq8yL2Cl8N%2BgnaA8RvX3iUA%3D%7Ctkp%3ABk9SR66j3qr_Yg
Skoti:
Stainless stuff has not the same strength as normal zinc plated high tensile steel fasteners.
Not ideal for engine, shockers, forks or brakes etc.
But probably ok for other light duty cycle parts.
Anyhow for a show pony it probably won't matter.
Stay safe
Skoti
Nashfly:
--- Quote from: Skoti on November 23, 2023, 08:16:27 AM ---Stainless stuff has not the same strength as normal zinc plated high tensile steel fasteners.
Not ideal for engine, shockers, forks or brakes etc.
But probably ok for other light duty cycle parts.
Anyhow for a show pony it probably won't matter.
Stay safe
Skoti
--- End quote ---
Yep, the scrutineers at the Isle of Man TT & Manx Grand Prix/Classic TT check (with a magnet) that engine mounting bolts are not stainless as they have been known to fracture
Doubt it would happen on a road machine though
Oddjob:
--- Quote from: Skoti on November 23, 2023, 08:16:27 AM ---Stainless stuff has not the same strength as normal zinc plated high tensile steel fasteners.
Not ideal for engine, shockers, forks or brakes etc.
But probably ok for other light duty cycle parts.
Anyhow for a show pony it probably won't matter.
Stay safe
Skoti
--- End quote ---
That would be sort of true Skoti IF the SOHC engines used tensile steel bolts, which to my knowledge they don't (and if they do why aren't they marked as tensile bolts, like 8.8). The engine bolts are AFAIK mild steel, seen more than a few with stripped threads, fractured etc which you wouldn't see in tensile steel. Saying that, the various grades of tensile bolts means that some are actually the same tensile strength as good stainless. BSB and MotoGP bikes for instance use a lot of titanium bolts for lightness, it's also stronger generally than stainless and significantly stronger than most steels except for high grade carbon steel, which would be unsuitable for engine bolts due to the water these bolts are exposed too. AFAIK Titanium doesn't stick to a magnet either so why scrutineers would frown on a material that strong is beyond me, it could be more to do with the bike being or using original parts than strength.
I've used either stainless or titanium bolts for my bikes since the late 70s, the cost then was exorbitant but they were also the only bolts to survive rat piss for 40 years, a quick wipe and they were as good as new. The Honda bolts were scrap, even zinc plating has it's limits. I've yet to suffer a failure except once when I tightened down some nyloc nuts onto the ends of the long end bar running through the footrests, being new to stainless I was unaware of galling. When I attempted to remove the nuts they were as solid as if they'd been welded in place, in the end I used a piece of scaffolding tube 6ft long as a lever on a T bar, the force exerted was so powerful the actual bar sheared just behind the nut, the nut never came off even when heat was used to melt the nylon locking part. Middleton made me a replacement FOC and advised using copper grease in future.
I can safely say I have fewer than 10 of the original Honda bolts left on my bike and possibly even less than that figure on my 1300, only specialised bolts are kept as standard, caliper bolts are either stainless or titanium, pad pins titanium, never a failure in all that time and I've raced the 500 and ride the 1300 very hard.
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