SOHC.co.uk Forums > CB500/550

Metric Bolt pitch

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davidcumbria:
A thread guage to measure the pitch of the bolts you are replacing is a very good investment and saves multiple wrong purchases. DAMHIK 🙂

AshimotoK0:
I always go by this 1967 Threads Service Bulletin to check if there was a pitch change post 1967. All of the M8 fasteners I have come across on my bikes have been 1.25 mm pitch.

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Matt_Harrington:

--- Quote from: Bryanj on June 08, 2024, 08:16:03 AM ---If they still do them Zeus tables are good

--- End quote ---
Yes, still available and I regularly refer to mine - mind you I mess about with BSW & BSF as well!

SumpMagnet:
From personal experience, if it JUST says metric, then you are getting standard or coarse pitch. So an M8 would be 1.25.
Metric fine is 1.0 pitch for M8 and would normally specify.
Never come across extra fine in the wild. Or at least...I don't think I have!

If in doubt, message the supplier. If they don't know...buy elsewhere. If they DO know, they are usually pretty understanding.

Smaller sizes are hard to tell visually, but larger bolts are easy to tell by eye. Drop the pitch gauge onto the thread and see if it fits. A thread pitch chart just helps you choose the right pitch gauges to try.

Mike_Berkshire:
Thanks all, really helpful information. I will use the pitch gauges I got with the tap and die set which I can cross reference with the tables.

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