Long overdue post here. If you have Asian vehicles and equipment you need these. For too long I wondered why my my phillips never really seemed to fit well. Several years ago I was enlightened by a technician forum on what I thought was a simple right tool for the job choice. They also work great on regular phillips screws. Vessel brand is high quality and also available with a built in impact driver mechanism.
https://www.amazon.com/Vessel-Megadora- ... 64&sr=8-11
JIS screwdrivers
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splatterdog
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Ace
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Re: JIS screwdrivers
Good point. I went years before learning the difference between standard Phillips and JIS screw heads.
JIS = Japanese Industrial Standard.
https://en.wikipedia.org/wiki/List_of_s ... JIS_B_1012
JIS B 1012
The JIS B 1012[26] was commonly found in Japanese made equipment, such as cameras and motorbikes. Superficially it looks like a Phillips screw with narrower and more vertical slots, to give less tendency to cam out. The bottom of the recess is flat, and the point of the driver has to be blunt. A Phillips screwdriver has the same 26.5 degree cone angle but because of the tapered slots will not seat fully, and will damage the screw if forced. A correctly sized JIS driver will engage at full depth into a Phillips or Pozidriv head screw slightly loosely, but without damage. JIS heads are often identified by a single dot or an "X" to one side of the cross slot, though this is not always the case.[27]
"JIS" or ISO 8764 standardized cruciform-blade screwdrivers are available for this type of screw, and should always be used to avoid head and driver damage.
ISO 8764
(PH) (PZ) ISO 8764 PH drivers[28] are nearly identical to JIS B 1012 drivers. ISO 8764 has superseded JIS B 1012 in Japan as well as being used in many other countries. The standard specifies that drivers and bits are to be marked with a "PH" or "PZ" followed by the size number (000, 00, 0, 1, 2, 3), though not all manufacturers do this.[29]
Unlike JIS, the ISO 4757 standard for cross-head screws does not specify a dot on the screw head.[30]
Phillips II
Phillips II recesses are compatible with Phillips drivers, but have a vertical rib in between the cruciform recesses that interacts with horizontal ribs on a Phillips II driver to create a stick-fit, and to provide anti cam-out properties (the ribs are trademarked as "ACR" for Anti Cam-out Ribs).
-------------------------------------------------------------------------------------------------------
There are some other variations on this idea; see the complete article for more info.
JIS = Japanese Industrial Standard.
https://en.wikipedia.org/wiki/List_of_s ... JIS_B_1012
JIS B 1012
The JIS B 1012[26] was commonly found in Japanese made equipment, such as cameras and motorbikes. Superficially it looks like a Phillips screw with narrower and more vertical slots, to give less tendency to cam out. The bottom of the recess is flat, and the point of the driver has to be blunt. A Phillips screwdriver has the same 26.5 degree cone angle but because of the tapered slots will not seat fully, and will damage the screw if forced. A correctly sized JIS driver will engage at full depth into a Phillips or Pozidriv head screw slightly loosely, but without damage. JIS heads are often identified by a single dot or an "X" to one side of the cross slot, though this is not always the case.[27]
"JIS" or ISO 8764 standardized cruciform-blade screwdrivers are available for this type of screw, and should always be used to avoid head and driver damage.
ISO 8764
(PH) (PZ) ISO 8764 PH drivers[28] are nearly identical to JIS B 1012 drivers. ISO 8764 has superseded JIS B 1012 in Japan as well as being used in many other countries. The standard specifies that drivers and bits are to be marked with a "PH" or "PZ" followed by the size number (000, 00, 0, 1, 2, 3), though not all manufacturers do this.[29]
Unlike JIS, the ISO 4757 standard for cross-head screws does not specify a dot on the screw head.[30]
Phillips II
Phillips II recesses are compatible with Phillips drivers, but have a vertical rib in between the cruciform recesses that interacts with horizontal ribs on a Phillips II driver to create a stick-fit, and to provide anti cam-out properties (the ribs are trademarked as "ACR" for Anti Cam-out Ribs).
-------------------------------------------------------------------------------------------------------
There are some other variations on this idea; see the complete article for more info.