Spoiler
Probably at the hardware store picking up more Phillips head screws.
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A collection of some classic Lemmy memes for your enjoyment
Note that according to hardware manufacturer Tekton, the differences are smaller than you think and especially the diagrams are highly misleading as they actually compare PH2 and PH0.
Just about the only major difference is the thread pitch and that is only different in JIS screws if they don't have the dot.
Can you elaborate on what comparing PH1 and PH0 means?
The diagram is not comparing between two standards but between two sizes within the same standard. Philips size 0 (PH0) has a slightly different shape than Philips size 1 (PH1) and up.