What do the letters in my screw part number mean?

Head style:
F = Flat
P= Pan
O = Oval

U = Undercut
PH = Phillips
CS = Combination screw
WS = Wood screw
MS = Machine screw
SMS = Sheet metal screw
TEK = Tek Screw
TOR = Torx screw
SEC = Security screw
HEX = Hex screw
HEX WSHR HD - Hex washer head


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