the phillips screwdriver got its name from henry frank phillips.
the phillips screwdriver got its name from henry frank phillips.
where did the phillips screwdriver get its name?
henry frank phillips
henry f. phillips









































henry frank phillips (june 4, 1889 – april 13, 1958) was an american businessman from portland, oregon. the phillips-head ("crosshead") screw and screwdriver are named after him.









































the importance of the crosshead screw design lies in its self-centering property, useful on automated production lines that use powered screwdrivers. phillips' major contribution was in driving the crosshead concept forward to the point where it was adopted by screwmakers and automobile companies. the credited inventor of the phillips screw was john p. thompson who, in 1932, patented (#1,908,080) a recessed cruciform screw and in 1933, a screwdriver for it.
henry f. phillips
while a phillips screwdriver has slightly tapered flanks, a pointed tip, and rounded corners, a pozidriv screwdriver has parallel flanks, a blunt tip, and additional smaller ribs at 45° to the main slots. the manufacturing process for pozidriv screwdriver bits is therefore more complex than that for phillips: while a phillips screwdriver bit can be manufactured by cutting four simple slots, the pozidriv screwdriver tip requires two machining processes at right angles for each slot.
list of screw drives