There is another standard for a Cross Head Screws.

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There is another standard for a Cross Head Screws.

Post by Macca1066 »

This month's prize is a set of "JIS" Screwdrivers and for those that have not read the info, in part it reads "JIS - or Japanese Industry Standard - is a Pacific Rim standard used for "Philips" (cross) type screwdrivers. Most people, professional mechanics included, don't even know that such a thing exists. But every "Philips" screw on a Japanese vehicle is not a Philips screw at all, but a JIS screw. They can be identified with a small dot on the top of the screw:"

DID YOU KNOW ... There is another "Standard for a Cross Head Screw and Screwdrivers?
It is called "PoziDriv". The difference between Phillips and Pozidriv
(The following is copied from ""). Phillips screw heads are designed so that the screwdriver will cam-out (slip) if too much torque (power) is applied. ... However, they are liable to slippage, and can damage the screw. Pozidriv screwdrivers, on the other hand, do not fit Phillips heads.
(The following is copied from ""). The Pozidriv (sometimes incorrectly spelled "Pozidrive") is an improved version of the Phillips screw drive. ... While a Phillips screwdriver has slightly tapered flanks, a pointed tip, and rounded corners, a Pozidriv screwdriver has parallel flanks, a blunt tip, and additional smaller ribs at 45° to the main slots.

In my experience PoziDrive is a much better Screw & Screwdriver to Phillips Drive. While I have limited use of JIS screws, I have used Pizidriv a great deal in Cabinetmaking. It would be a toss up of which is the better weather JIS or Pozidriv is the better option.
Have a look at ... illips.JPG to see clearly the difference.

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Re: There is another standard for a Cross Head Screws.

Post by MikeB »

Actually, there are several types of cross-head screws. One not noted here is the Reed and Prince (Frearson). Similar to the Phillips but yet different enough that it requires a different driver. I was first introduced to a Reed and Prince in 1969 when I received my first tool set while in the Air Force.

Here's a description I found on the differences between the two! The Phillips screwdriver has about 30-degree flukes and a blunt end, while the Reed and Prince has 45-degree flukes and a sharper, pointed end. The Phillips screw has beveled walls between the slots; the Reed and Prince, straight, pointed walls. In addition, the Phillips screw slot is not as deep as the Reed and Prince slot.

Here is a large list on Wikipedia that you may be interested in seeing.
1998 - GL1500 w/184,500 miles ~ 2017 - GL1800 w/13000 miles
USAF Avionics Communications Tech - 1968 - 1986 / Flight Engineer C-130E - C-141B - 1986 - 1992. Retired
Industrial Maintenance Tech - 1992 - 2014
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