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. Heads are usually identifiable by a single raised dot to one side of the cross slot. JIS B 1012:1985 screw standard is throughout the Asia market and Japanese imports. The driver has a 57 degree point with a flat tip, parallel wings.
Advantages and Disadvantages of JIS
Most people and companies outside of Japan have absolutely no idea what they are. With the similarity in appearance to the Frearson and the Phillips the screws are often damaged in removing and installing with the wrong tools. JIS tends not to camout like Philips. The JIS driver can be used on Phillips quite easily but not reciprically. Drivers are not easily available in North America, try your local RC Airplane hobby shop. Most RC Helicopters use JIS screws to mount the propeller. JIS-spec cross-head screws are generally marked with a single raised dot or an "X". JIS always fit Phillip fasteners, but because of slight design differences, Phillips drivers may not fit JIS fasteners. (unless the tip is ground down a bit).
Post by JerryScript on Sept 23, 2014 23:00:02 GMT -5
You run into this a bit with tech tools, some of those tiny screws holding computer components together are a nightmare to remove, if they can be removed at all. Like pmatulew says, grind off the end off a standard Philips driver, and you are good to go for most needs.
I love strange tools. 30 years ago I was a mechanic in the Army. We had this crankable torque driver that was basically a large box with a crank on one side, and a fitting for sockets on the other side. You used floor jacks/blocks to get the tool to the proper height, then strap wrenches to hold it tight against whatever you were working on. Then you just started cranking, and cranking, and cranking. Each turn of the crank was equivalent to about a 1/32nd turn on the socket side. A bit of heat and penetrating oil, and this baby would get any bolt or nut off!