Does your Phillips driver feel like it doesn't quite fit that screw? Chances are that's because it's not a Phillips screw, it's a JIS screw.
What is JIS bit?
JIS or Japanese Industry Standard screws are just different enough in shape that Phillips drivers will not fit well and slip/strip them. The difference is in the leading angle of the point of the driver. Phillips bits have a larger angle and therefore don't bottom out in the JIS screws, causing slippage.
JIS or Japanese Industry Standard screws are just different enough in shape that Phillips drivers will not fit well and slip/strip them. The difference is in the leading angle of the point of the driver. Phillips bits have a larger angle and therefore don't bottom out in the JIS screws, causing slippage.
Where can JIS screws be found? They're holding together pretty much everything manufactured in Japan most notably Honda Goldwing & other Japanese motorcycles, Mazda Miata's, and a broad range of small engines and medical and CNC equipment.
How can you spot a JIS screw? See the graphic, the vast majority of them have a tiny dot stamped into them. However, customers have written in and said that not every JIS screw has a stamped dot.
So if a Phillips driver doesn't fit quite right and the product is Japanese in origin, it's a safe bet that the screw is a JIS.
Fortunately, KINGSDUN makes two drivers fit JIS screws, Crosspoint bits #1 and #2.
How many JIS sizes are there?
The Japanese Industrial Standard (JIS B 2401) lists 194 sizes of O-rings which are unique to Japan's automotive and manufacturing industries.
Is JIS the same as ISO?
Are JIS and ISO Taper Bottom Brackets Compatible? Whilst both versions of the square taper Bottom Bracket look the same, the European-made ISO square taper spindles are slightly longer, tapering down to a small end than the Japanese Industry Standard (JIS) Bottom Bracket spindles do.
What standard is JIS?
JIS is the standards used for industrial activities in Japan, coordinated by the Japanese Industrial Standards Committee (JISC) and published by the Japanese Standards Association (JSA).
What material is JIS?
JIS G 3113 is a Japanese material standard for Hot Rolled steel plates, sheets, and strips for automobile structural usage. The structural quality hot rolled SAPH 370 steel is more reliable in its tensile strength than SAPH310 steel.
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