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Intro: When a Phillips Is Not a Phillips! Cross-head, Cross-Point, Cruciform, Square Drive Screws and Drivers These screw types have a + shaped recess on the head and are driven by a cross-head screwdriver, designed originally ... Step 1: Early Screws.
The term cap screw refers to many different things at different times and places. Currently, it most narrowly refers to a style of head (see the gallery below). More broadly, and more commonly, it refers to the group of screws: shoulder screws, hex heads, counter-sunk heads, button heads, and fillister heads.