How to differentiate PK (self-tapping) screws and chipboard screws?
I have lots of both PK (self-tapping screws for sheet metal) and
chipboard screws but I don't always know which are which. Is there
any easy way to tell them apart?
I guess anything with a pan-head or a cheese-head is fairly likely to
be a PK screw but countersunk heads present more of a problem.
I suppose I can try actually screwing them into a sheet of aluminium
but before I do that I thought there might be an easier way.
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Chris Green
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