Tank badge screw

[Hahnda]

You have to be careful with some of the JIS fasteners that you can order. They might not have the correct thread pitch even though they are JIS. You need to double check before you order. Some of them only have JIS heads and not the old JIS thread pitch we need.

[Seadog]

That's good to know; I'd never heard of that before. In this case, I have a set of badge screws from that vendor and just checked the fit. They're fine.

You have to be careful with some of the JIS fasteners that you can order. They might not have the correct thread pitch even though they are JIS. You need to double check before you order. Some of them only have JIS heads and not the old JIS thread pitch we need.

[Glenn-N]

It's weird. I got a set from CMS, didn't fit.
I got a set delivered at home from the same seller as stated from eBay and they didn't fit.

Contacted him and he personally tried 4 other screws to JIS nuts and a pre-1967 gas tank before shipping them to me.
Again they don't fit. The thread pitch seems smaller then the pitch from my old (fitting) screws so I guess they are 0.5 pitch and we need 0.6

[Tim Allman]

Late in the lifetime of theses bikes Honda put out a service bulletin about its change to ISO hardware. This suggests that some were made to the new standard but I've never seen one and the parts manual shows no sign of it. Others may have different experience.

Hahnda is correct in his comment above. Although getting the right thread pitch is not too hard, getting the right hex size can be very difficult. You really do have to check out all of the screw specs.

[Hahnda]

Here is an example-

https://www.mcmaster.com/#94387a212/=15rkcmr

They call them JIS screws. If you look at the M5 screws offered they are .8 pitch instead of the .9 pitch we need. Same goes for the M3, wrong pitch.