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The Pozidriv (or SupaDriv) is a type of screw
Screw

A screw is a shaft with a helix groove or screw thread formed on its surface and provision at one end to turn the screw. Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force....
 head and screwdriver
Screwdriver

The screwdriver is a device specifically designed to insert and tighten, or to loosen and remove, screws. The screwdriver is made up of a head or tip, which engages with a screw, a mechanism to apply torque by rotating the tip, and some way to position and support the screwdriver....
, jointly patented by the Phillips Screw Company and American Screw Company. The name is thought to be an abbreviation of positive drive. It is similar in appearance to the classic Phillips
Henry F. Phillips

Henry F. Phillips , a United States businessman from Portland, Oregon, has the honor of having the Phillips-head screw and screwdriver named after him....
 cross-head, but in fact is substantially different. The largest advantage it offers is that, when used with the correct tooling in good condition, it does not cam out
Cam out

To cam out is a process by which a screwdriver slips out of the head of a screw being driven once the torque required to turn the screw exceeds a certain amount....
, allowing great torque to be applied.

differences lie in the way that the drivers are machined.






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Encyclopedia


The Pozidriv (or SupaDriv) is a type of screw
Screw

A screw is a shaft with a helix groove or screw thread formed on its surface and provision at one end to turn the screw. Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force....
 head and screwdriver
Screwdriver

The screwdriver is a device specifically designed to insert and tighten, or to loosen and remove, screws. The screwdriver is made up of a head or tip, which engages with a screw, a mechanism to apply torque by rotating the tip, and some way to position and support the screwdriver....
, jointly patented by the Phillips Screw Company and American Screw Company. The name is thought to be an abbreviation of positive drive. It is similar in appearance to the classic Phillips
Henry F. Phillips

Henry F. Phillips , a United States businessman from Portland, Oregon, has the honor of having the Phillips-head screw and screwdriver named after him....
 cross-head, but in fact is substantially different. The largest advantage it offers is that, when used with the correct tooling in good condition, it does not cam out
Cam out

To cam out is a process by which a screwdriver slips out of the head of a screw being driven once the torque required to turn the screw exceeds a certain amount....
, allowing great torque to be applied.

Differences

The differences lie in the way that the drivers are machined. The Phillips driver has four simple slots cut out of it, whereas in the case of the Pozidriv, each slot is the result of two machining processes at right angles. The result of this is that the arms of the cross are parallel-sided in the case of Pozidriv, and tapered in the case of Phillips. The pozidriv has four additional points of contact, and does not have the rounded corners that the Phillips screw drive has. In ANSI standards it is referred to as type IA.

The pozidriv screw can easily be distinguished by a line emboss
Embossing

Embossing is the process of creating a three-dimensional image or design in paper and other ductile materials. It is typically accomplished with a combination of heat and pressure on the paper....
ed in the screw head at 45 degrees to the slots for the driver. Thus, if the driver slots are at 0, 90, 180 and 270 degrees, the marker lines are at 45, 135, 225 and 315 degrees.

Advantages over Phillips type


This design is intended to decrease the likelihood that the Pozidriv screwdriver will slip out, provide a greater driving surface, and decrease wear and tear. The marker lines on a Pozidriv screwdriver will not fit a Phillips screw correctly, and are likely to slip or tear out the screw head. Phillips screwdrivers will fit in and turn Pozidriv screws, but will cam out
Cam out

To cam out is a process by which a screwdriver slips out of the head of a screw being driven once the torque required to turn the screw exceeds a certain amount....
 if enough torque is applied, potentially damaging the screw head.

Disadvantages


The chief disadvantage of Pozidriv screws is that they are visually quite similar to Phillips, thus many people are unaware of the difference or do not own the correct drivers for them, and use incorrect screwdrivers. This results in difficulty in unscrewing the screw and in damage to the slot, rendering any subsequent use of a correct screwdriver unsatisfactory.

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