About J.I.S. Fasteners

J.I.S. or Japanese Industrial Standard screws are to be found on Japanese bikes and cars, models, musical instruments, radios, and
other electrical items.
We are happy to inform you that we have increased our range and will continue to add more hard to find fasteners to our growing collection.

All our JIS fasteners are sourced from and made in Japan.

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The difference between JIS and later ISO standard is in both the size of the head, and the pitch of the thread of the screws, nuts or bolts
JIS Philips pan head screws have a smaller head size compared to ISO screws.
The JIS thread used on pre1967 motorcycles were coarse pitch, see our J.I.S. Phil Pan (Pre1967 Pitch) zinc page

JIS threads were used on a number of Japanese vehicles manufactured after 1967 too.
JIS thread nuts and bolts not only use a different pitch, but the A/F spanner size is also larger on these early fasteners (M5- 9mmA/F M8- 14mmA/F)

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It starts to get confusing here.....!!!

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The A/F spanner size on post 1967 JIS is normally smaller, however some nuts and bolts can have a larger A/F Spanner size and yet still have a fine or standard pitch, see individual listings for thread size and A/F fitment

While the thread pitch on the M10 and above are normally fine pitch on motorcycles, some manufacturers used the coarse pitch with larger spanner size A/F

Japanese nuts and bolts used on motorbikes do not normally come with the grade of steel stamped on the nut unlike ISO nuts.

The bolts are either unmarked, Mark 4 ,Mark 7, Mark 8, Mark 9, Mark 10, some M5 and M6 were marked 4,8

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Japanese bolts used on cars can come with the grade of steel stamped on the bolt head, they can either be unmarked, Mark 4 ,mark 7, Mark 8, Mark 8.8 Mark 9, Mark 10, Mark10.9 or Mark12.9 depending on the make of vehicle

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Hope this helps.....it is a minefield of contradictions, no one rule seems to fit, so best to check on the individual listing for thread, head size etc.

We have tried to cover as many sizes as possible

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