6-32X1/2-PHP
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54743845-6-32X1/2-PHP
SCREW, 6-32X1/2, PHILLIPS PAN H
given in nominal sizes, not in the actual measurement.
A special design is cut into the head of the screw that the screwdriver will fit into when the screw is driven into a surface. This is called a drive. There are many different designs of drives.