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.
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)
It starts to get confusing here.....!!!
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
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
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
Phillips Pan Head or
Phillips Pan Head Screws with encapsulated Spring Washer
Phillips Pan cross/slot Head Screws with encapsulated Spring Washer
JIS Thread Machine Screws - coarse pitch Pre 1967 on bikes, in M3, M4 and M5
Phillips Round- Oval Head Countersunk Screws
Phillips Flat Head Countersunk Screws
Upset Head hex/cross Set Screws
Flanged Hex/Cross Head Bolt
Dome-Raised Head Bolt
Mark 7 Head Bolt
Also in Mark 8
Unmarked Head Bolt
Sometimes M4 M5 M8 and M12 may have a dot on the head
Upset Mark 4 Head Bolt- also in Mark 7
Upset Flanged Mark 7 Hex Head Bolt
Unmarked Head Bolt with encapsulated Spring and JIS washer
Also with Mark 7 on head
Hex Head Set Screw Full Thread Unmarked and Mark 7 and 8
Hex Head Bolt Half Thread Unmarked
and Mark 7 and 8
Type 1 Hex Nut
Chamfered only one side.
Also known as an Engineers nut
Type 2 Hex Nut
Chamfered both sides.
Also known as Full Hex nut
Type 3 Hex Thin Nut
Chamfered both sides.
Also known as a Half or Thin Hex nut
Type 1 Hex Nut M5-0.9 Pitch Chamfered only one side. Also known as an Engineers nut
Nuts A/F can be standard size or small - Pic is of an M10 in both 17mm A/F and 14mm A/F
Some JIS Nuts can have dimples in the face or side but are otherwise unmarked
Nyloc Nuts - Lock Nut with a Non Metallic Insert to help prevent loosening
Lock Nut with Metallic Insert to help prevent loosening
Low top Dome Nut with also called and Acorn Nut
Low top Flanged Dome Nut
Also called a Flanged Acorn Nut
Low top Dome Lock Nut with Metallic Insert to help prevent loosening
High top Dome Nut
Also called an Acorn Nut
Flanged Lock Nut with Metallic Insert to help prevent loosening
Toothed Flanged Lock Nut to help prevent loosening
Plain Flanged Nut to eliminate the use of a washer
Castle nut for use with a split pin or R clip to help prevent loosening
JIS Washers in many different sizes, widths and thickness
JIS Spring Washers In different sizes and thicknesses.