SOHC.co.uk Forums > CB500/550
New frame/engine bolts. What type?
DomP:
Hi Alex, I'm ordering all of the m10 and m8 bolts, nuts and spring washers for my engine mountings from Kays (Kayfast) on Ebay, it racks up quite quickly for a few odd sized bolts and you can often get 10 for very little more than you can 5 for example but I done see where I'd ever need the spares.
Oddjob:
The trouble with a lot of these sellers Dom is that they tend to be stamped on the head with markings, which tbh I think look awful and they also tend to have the wrong size heads on the bolts, 6mm ones are fine with 10mm heads but 8mm tend to have 13mm and they should be 12mm and worse 10mm tend to have 17mm heads and they should be 14mm on a Honda, sometimes this means they won’t fit properly due to space constraints. You’ve also got the thread pitch being wrong, mostly on 10mm and above. Honda used metric fine for most of these bolts and the ones you normally get are standard metric
McCabe-Thiele (Ted):
Ken is right about the head sizes you will only be able to get an open ender on the front bottom engine mount when not using original so an accuratecTorque setting is pretty much impossible.
DomP:
Good points by Ken and Ted, I wasn't worried about thread pitch as the engine mounting bolts are all going onto their own nuts but I hadn't considered this with the lower yoke pinch bolts. Are they standard 1.5mm pitch on the m10 bolts?
I might have to have a rethink on the lower engine mounts.
Oddjob:
I think metric fine for M10 is 1.25 pitch Dom.
https://www.stainlessmiddleton.co.uk/32908-metric-fine-bolts-setscrews
Middletons sell the correct type, 14mm head.. A hex set is threaded full length, most Honda bolts are not hex set bolts, just the stand hex bolts. Most bolts under 40mm in length tend to be threaded full length so are hex set, same for screws, those are called setscrews.
Middleton bolt are really good quality, the head has no writing on and tends to be highly polished, the end where the thread stops is domed. The only ones I've found that have the writing on the top tend to be ones I think he buys in nowadays and are small M5 bolts which I use for the carbs. I tend to file the markings off and polish the top myself when I get them.
For engine bolts you have a choice, use metric fine but remember to also buy metric fine nuts to match OR buy normal standard bolts and use normal nuts, so long as where it is fitting isn't prethreaded you can choose either.
He also does M8 nuts in 12mm spanner size, M10 in 14mm spanner size.
https://www.stainlessmiddleton.co.uk/32930-metric-nuts-full
The M8 bolts do tend to be 13mm spanner size though but TBH that matches the size that Yamaha and Suzuki used, it was Honda that was the odd one out. He does do some really long ones though, great for crankcase bolts etc that can be seen
https://www.stainlessmiddleton.co.uk/32906-metric-bolts-setscrews?page=3
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