Honda-SOHC

Other Stuff => Misc / Open => Topic started by: McCabe-Thiele (Ted) on November 29, 2023, 07:57:14 PM

Title: Why are M9 SS 1.25 pitch a 20/30 mm flanged bolts so hard to find
Post by: McCabe-Thiele (Ted) on November 29, 2023, 07:57:14 PM

If I have worked the size out correctly the captive headlamp earth nuts on the 400 & 500 are M9 presumably 1.25 pitch thread can anyone point me in the direction of a supplier for some SS bolts?

I had some SS hex headed flange bolts in my stock & could do with a couple more.

Title: Re: Why are M9 SS 1.25 pitch a 20 mm flanged bolts so hard to find
Post by: K2-K6 on November 29, 2023, 09:18:41 PM

Sure it's M9 Ted ?

I dont know, but highly unusual to come across one....there's one in the cylinder head of XL 500 engine I recall.

Title: Re: Why are M9 SS 1.25 pitch a 20 mm flanged bolts so hard to find
Post by: McCabe-Thiele (Ted) on November 29, 2023, 09:36:27 PM

Not good with threads K2-K6  but my calipers show the diameter as 9.06mm on the unthreaded section with a 14mm flanged head.

Title: Re: Why are M9 SS 1.25 pitch a 20 mm flanged bolts so hard to find
Post by: Matt_Harrington on November 30, 2023, 09:13:49 AM

Ted, measure the thread section rather than the unthreaded part. The 'outer' dim of the threads is what you want.....

Title: Re: Why are M9 SS 1.25 pitch a 20/30 mm flanged bolts so hard to find
Post by: McCabe-Thiele (Ted) on November 30, 2023, 02:41:26 PM

Mystery is over they must be M10 bolts not M9  as I found a couple of NOS bolts in my stock of 400 bits that came with the bike p/n 93101-100320B - nice shiney chrome.

Looking at the part number using Kens information/logic  on part number construction they must be M10 x 32mm long B stands for chrome.

Title: Re: Why are M9 SS 1.25 pitch a 20/30 mm flanged bolts so hard to find
Post by: Bryanj on November 30, 2023, 04:33:52 PM

Probably "rolled" threads rather than die cut, supposed to be stronger