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-as of [13 MAY 2025]-
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-OUR [POZIDRIV] SCREW DRIVERS-
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“POSITIVE DRIVE”
(IN REFERENCE TO ITS “IMPROVED GRIP” COMPARED TO “PHILLIPS HEAD”)
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The Pozidriv, sometimes incorrectly spelled “Pozidrive”, is an improved version of the Phillips screw drive.
It is designated “Type IA” by ANSI standards.[18] and “Type Z” in ISO documents.
The Pozidriv was patented by GKN Screws and Fasteners in 1962.[19][20]
It was designed to allow more torque to be applied and greater engagement than Phillips drives.
As a result, the Pozidriv is less likely to cam out.[11][21][22]
It is similar to, and compatible with, the Supadriv screw drive.[23]
Pozidriv screwdrivers are often designated using the letters “PZ” followed by a size code of 0, 1, 2, 3, 4 or 5 (in order of increasing size).[11]
The numbers do not correspond to nominal screw size numbers.
PZ1 is normally used in screws with nominal diameters of 2–3 mm,
PZ2 in 3.5–5 mm screws
and PZ3 in 5.5–8 mm.
These sizes roughly correspond to the Phillips head numbers.
Pozidriv screws have a set of radial indentations (tick marks) set at 45° from the main cross recess on the head of the screw, which makes them visually distinct from Phillips screws
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.
Both Phillips and Pozidriv bit types can be manufactured in four cuts from a tapered blank, although Pozidriv screwdriver bits require a slightly more complex cutter than for Phillips bits.
Pozidriv and Phillips look broadly interchangeable, but may cause damage if mixed.
Pozidriv screwdrivers will jam fit into Phillips screws, but when tightened they may slip or tear out the Phillips screw head.
Conversely, while Phillips screwdrivers will loosely fit and turn Pozidriv screws, they will cam out if enough torque is applied, potentially damaging the screw head or driver
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