Bumping an old thread with some observations ...
Long story: This week I bought new made in Japan “JIS compatible” impact bits for my hand impact driver. When I compared them to my “regular Phillips #3” impact bit, it was the same appearance of the tip. Both of them picked up a JIS screw and held on upside down. Then I got my Vessel +3 driver, which was shaped near identical to the impact bits and of course, it picked up the JIS screw upside down. Next, I picked up a craftsman PR Phillips #3, the tip looked different of course ... but it also fit and picked the JIS screw and held it upside down.
I was confused.
I then found a craftsman WF Phillips #3, and the tip was again different from the PR #3 was well different from as the vessel +3, and the WF Phillips would not fit the JIS screw, it wouldn’t hold it in any position, screw just fell to the workbench.
Next I went and got my Phillips #2 craftsman drivers, in PR and WF variety ... and yes, the tips are different. I did not have a JIS +2 screw to test.
In any case, I propose that the craftsman PR Phillips driver tips are different from the craftsman WF Phillips driver tips, and that the PR tips are spec’d closer to the “JIS screw” standard than the WF Phillips are.
I’m wondering if anyone else has seem similar?