SOHC.co.uk Forums > CB350/400
Front axle potential problem?
AshimotoK0:
Personally, I wouldn't have used A2 stainless steel for the disc retaining bolts Ted ... from memory they have 30% less tensile strength than 8.8 steel. plus the head size is likely 13mm, which isn't correct
McCabe-Thiele (Ted):
--- Quote from: AshimotoK0 on December 18, 2021, 02:48:59 PM ---Personally, I wouldn't have used A2 stainless steel for the disc retaining bolts Ted ... from memory they have 30% less tensile strength than 8.8 steel. plus the head size is likely 13mm, which isn't correct
--- End quote ---
The SS bolts came with a selection pack - (I'm not a mechanical engineer so please forgive my simplistic view) I considered the tensile strength aspect but disregarded it as I considered there is liitle by way of tensile forces acting on the bolts - the torque setting is not that high (Not sure what it is?) - that the shearing forces from the disc trying to rotate on the hub would not be big enought to shear the bolts. It has not dawned on me until you mention it that the heads are 13 mm not 12 mm like the originals as I had not compared them.
I think that the bigger headed bolts are probably the cause of my centreing problems- I have the old bolts but the heads are pretty corroded so I will replace them. Pleased I have not rushed to fit the front wheel yet! Thanks for the extra pointer about the head size difference Ash.
Update: listed as no longer available at DS & others - I'll have to clean up the originals.
Bryanj:
The Japanese dont work fully to iso standards, in that 8mm bolts have a 13mm hex but they seem to prefer 12mm.
There is another non prefered hex size higher up the range but cant remember which
Spitfire:
Got this from Custom Fasteners website years ago when I was working on the bike.
M10(1.25 pitch) and M12(1.25 pitch) FINE THREAD METRIC BOLTS
For use on Japanese motorcycles and cars. M10(1.25) bolts have a 17mm spanner size, M12(1.25) bolts have a l9mm spanner size. The Japanese often
use a smaller size head on their bolts, so please check there is sufficient clearance for the standard size head we supply, before ordering.
NOTES ON METRIC BOLTS
M4 fits spanner size 7mm. M4 thread pitch is 0.70mm.
M5 fits spanner size 8mm. M5 thread pitch is 0.80mm.
M6 fits spanner size 10mm. M6 thread pitch is 1.00mm.
M7 fits spanner size 11mm. M7 thread pitch is 1.00mm.
M8 fits spanner size 13mm. (Japanese M8 bolts use 12mm spanner size). M8 thread pitch is 1.25mm.
M10 fits spanner size 17mm. M10 thread pitch is 1.50mm.
Cheers
Dennis
Oddjob:
What length are the bolts Ted?
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