SOHC.co.uk Forums > CB350/400
Ted's daft question of the week ?
Bryanj:
Fine thread usualy to help stopping loosening ina vibration prone area but also in general courser threads in soft metal for a stronger root
philward:
--- Quote from: Macabethiele (Ted) on June 30, 2021, 06:33:03 PM ---
--- Quote from: Bryanj on June 30, 2021, 05:54:31 PM ---M6 will be m6x1 and the length is measured from under the head(or flange) to the end of thread. NOTE:- when purchasing,
BOLTS have a none threaded portion under the head
SETSCREWS are fully threaded
--- End quote ---
Thanks Bryan that means presumably as its's a smallish diameter it's automatically a coarse metric thread?
--- End quote ---
Ted, don't worry too much about M6, in my experience of the 500/750 sump bolts is that they are standard M6 x 1mm pitch (not fine)
I personally haven't come across anything other than standard M6 on the bikes I've built. There is probably an odd m6 fine application but it will be rare I think. M8 tend to be standard pitch, its M10 upwards that I have found is the metric fine.
McCabe-Thiele (Ted):
--- Quote from: philward on June 30, 2021, 11:14:49 PM ---
Ted, don't worry too much about M6, in my experience of the 500/750 sump bolts is that they are standard M6 x 1mm pitch (not fine)
I personally haven't come across anything other than standard M6 on the bikes I've built. There is probably an odd m6 fine application but it will be rare I think. M8 tend to be standard pitch, its M10 upwards that I have found is the metric fine.
--- End quote ---
Thanks Phil I will try to remeber that for future.
It seems cheaper to replace the sump bolts with SS ones than have the originals Zinc plated that's why I asked about the threads.
Spitfire:
Don't know if this will help but I found it when I renewed a lot of bolts on my 750F1, it was from the Custom Fasteners website.
IMPORTANT - PLEASE READ BEFORE ORDERING METRIC BOLTS.
Metric bolts in M4, M5, M6, M7 and M8 diameters are suitable for both European and Japanese motorcycles and cars.
However, M10 in the standard 1.50 pitch are only suitable as replacements on European machines. They will not fit Japanese vehicles which use their own specialised fine thread. Please see the next section in the catalogue for our specially produced range of M10 and M12 fine thread bolts for Japanese vehicles.
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
philward:
Thats what I have done - standard and flanged SS bolts are available cheaply.
If you want to go for originality on the engine covers you can see, try megapack on ebay, they do SS JIS (japanese 'philips' headed screws) - I've used these thoughout the builds I've done wherever there was originally a cross headed screw - here's an example
https://www.ebay.co.uk/itm/324584873287?hash=item4b92c41d47:g:JUYAAOSwnVVZmAnR
To save having to buy a pack with more in than I need of one length, I normally buy the longest I need and cut them down - and remember to use a specific JIS (Japanese Industry Standard) screwdriver. Back in the day, as a teenager, I used to butcher the screw heads using ordinary Phillips screw drivers - and blame the 'cheapo jap metal'!
Megapack have a range of other interesting bits and pieces
Standard caveat - use copper grease on the SS bolts
Not what you asked but hope it helps!
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