What is JIS screwdriver? Japanese Industry Standard: Often improperly referred to as Japanese Phillips. Commonly found in Japanese equipment, JIS looks much like a Phillips screw (and even more similar to Frearson), but is designed not to cam out and will, therefore, be damaged by a Phillips screwdriver if it is too tight.
What’s the difference between Phillips and JIS? 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.
Are JIS screws still used? Nowadays, hex-head fasteners have replaced JIS screws in most applications, but you’ll still find them on vintage bikes and the occasional modern machine. If you’re tired of butchering screws, you can always pick up the correct tool from Motion Pro.
How can you tell if a screw is JIS?