The Japanese Standard

Did you know that when working on a Japanese and most Chinese motorcycles,  what you thought were philips screws are in fact more likely to be JIS screws.

Ever notice how easy it is to round off or damage the cross-type screws on your motorcycle? Notice I didn’t say Phillips—that’s because chances are those screws are JIS screws. Have you been using the wrong screwdriver on your motorcycle?

JIS stands for Japanese Industrial Standard, and while similar to Phillips, the shape is slightly different. It was designed to behave differently than a Phillips when sufficient torque is reached. A Phillips is engineered to “cam out” once the screw is tight, whereas JIS is locked in and the torque setting is up to the user. It all comes down to the shape of the screw and bit.

With the naked eye it’s tough to tell the difference between the two. But if you look really close, you can see that a JIS bit has much tighter radius at its cross section; it’s nearly perpendicular. The JIS is also shallower, and the Phillips has more of a point.

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