IO-M3X8STP-100
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31701957-IO-M3X8STP-100
Screws & Fasteners Screws, M3 Thread, 8mm (L), Panhead Phillips, Steel, Self Tap, Black, Pack=100
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.