JIS screws

[kawonda750]

I am looking at case screws and am told that they are JIS. I have been restoring Kawasaki triples for years and can get stainless case bolt sets easily. In looking at bolt suppliers on the web, they show JIS as being a different sized head but with standard M threads. Is this correct? Can I use M threads maybe with hex heads?

[rrietman]

yes and yes. you want the right ones go to McMaster Carr for JIS head screws. you want the wrong ones any old 6mm will do.
Good luck
Randy

[jkv357]

I believe there was a time that Honda used JIS screws with a now non-standard thread pitch, so depending on the year an original 6mm JIS screw may not match a current M6's pitch.

Anyone know anything about that?

[Tim Allman]

I believe there was a time that Honda used JIS screws with a now non-standard thread pitch, so depending on the year an original 6mm JIS screw may not match a current M6's pitch.

Anyone know anything about that?

The change to ISO happened in the late 60s. Several screw sizes were affected but not the 6 mm ones because the two standards are essentially the same. So, any current 6 mm screws will work.

[JoeM]

I tackled the whole JIS issue some years ago. Further discussions here

https://fourwheelforum.com/showthread.php?t=1924