When a Phillips is not a Phillips!

step 10

step 10JIS - Japanese Industrial 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. 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).

JIS - Japanese Industrial Standard
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1 comment
Jan 2, 2009. 7:47 AMGecik says:
In the 1970s and early 80s -- back when "movies" were strips of photographic film I repaired those movie projectors. Eiki was a Japanese company with very good, easily maintained 16mm projectors used extensively at colleges and universities (at least in the USA). Eiki projectors used what they called "ISO screws" and which sound very much like your JIS description. The ISO screws were difficult to remove with a Philips screwdriver, but were a breeze with the ISO screwdrivers supplied by Eiki. These screwdrivers also worked well with Philips. I had to purchase ISO screwdrivers through Eiki; a company in Kobe, Japan manufactured the tools. After the big earthquake in Kobe, the manufacturing company did not rebuild. The present-day Eiki has no historical knowledge of the ISO screwdrivers or that they had even used these screws.

The "ISO screw" that I remember -- and still see in VCRs (soon-to-be-extinct also) and other Japanese manufactured goods has what I would describe as a "dimple" or a depression/dot between two sides of the "X."

I lost my notes on how to regrind a Philips blade to fit these screws. Any suggestions?

This was a great article! When I saw it I immediately read it to see if you had encountered the "Eiki ISO" and I also learned about things I haven't seen.

Thank you!