SOHC.co.uk Forums > CB350/400

Allen or hex head bolts?

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Dolomite_:
My engine is fully stripped and the cam tensioner hole has been repaired.

Quite a few of the original hex bolts are worse for wear so I've been looking to get at least the crankcase bolts replaced. Is there a best choice when choosing between allen or hex head bolts? There seem to be a lot more allen head replacements.

Can anyone recommend some companies that do sets of bolts? I've seen CMSK mentioned and they do a good range of allen head bolts, but if i can get them from somewhere where I dont have to pay £20+ on postage, that would be great :D

McCabe-Thiele (Ted):
Someone here will know a good supplier of bolts - My engine had SS  allen key headed bolts - the top ones hold water so I changed my upper ones only to normal Hex head it was a while ago I think I contacted someone called Tina - TSS fastners iirc.
I retained the Allen Key headed bolts on the lower casing to save a bit of dosh as I am well over budget.

Others here will confirm.

I just checked my top bolts came from Middletons I used Tina for some cam cover fasteners.

taysidedragon:
Stigs Fasteners does bike sets for many models Inc 400f. Stainless Allen heads.
I got mine from him, good service and good prices.

a2stainless.co.uk

Dolomite_:
Thanks! I'll check those out.

Is there a benefit to changing from hex to allen heads?

TrickyMicky:
If you are in a position to be able to use good quality sockets and spanners, I would be tempted to stay with the hex headed bolts.  Where socket head type fixings became popular was in replacing the Phillips type screws on engine side casings, much of this was before we discovered the existence of JIS tools!!  On a purely personal note, I don't particularly like the appearance of of full socket head screws on these casings, I think it gives a look similar to a piece of Military equipment. I have used button headed socket screws on these cases, the head shape being not too far removed from the original. Just a personal opinikon, and no criticism intended.

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