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Posi (Pozi) Drive Screwdriver

Pozidrive Screwdriver: Know Your Tools

Screwdrivers and screws. You may think you know it all, but there’s a lot going on in the world of hardware and torque-applying hand tools.

Can you tell the difference between different screwdrivers and screws (head types)?

Read on to learn how to tell them apart and when to use them.

Slot Screwdriver

This is the oldest drive type, dating back to the Middle Ages. It has a single straight-lined indentation and is used for projects where minimal power is required (carpentry work, repairing home appliances and vehicles).

Phillips Screwdriver

This screwdriver was developed in the 1930s to address some of the most common problems that kept repeating with slotted screws (the most basic driver type with a single straight indentation on the head), mainly cam-out. Cam-out occurs when the head of the screwdriver falls out of the screw. This can cause damage to the material you’re working with and slow down your work speed.

Phillips screwdrivers are designated with the letters PH and a number system that indicates its size (the bigger the size, the bigger the screwdriver.

This screwdriver has a cross-shaped indentation with a recessed middle.

Phillips II

The Phillips II screwdriver has an additional vertical rib in between the cross-shaped recesses. You already guessed it: the point of this is to prevent cam-out.

Pozidrive Screwdriver

The Pozidrive was developed in the 1960s as an upgrade to the Phillips model. Pozidrive lets you apply more power and engagement. Also, cam-out is less likely to occur.

Pozidrive screwdrivers are labeled with a PZ and follow a number system of increasing size.

The Phillips and Pozidrive screwdrivers look alike, but it’s actually not that hard to tell them apart. The Pozidrive also has a cross-shaped indented head with a recessed middle, but it has an additional four ribs at 45 degrees that the Phillips doesn’t have.

Supadrive Screwdriver

The Supadrive is an upgraded version of the Pozi. In terms of appearance, it has only one rib. It’s superior to the Pozidrive when it comes to preventing cam-out.

Supadrive and Pozi drivers can be used with either Supadrive or Pozi type screw heads.

Are Phillips and Pozi Interchangeable?

It’s quite obvious you can’t use a slot screwdriver with a Phillips screw, for example. The driver and screw head shapes are completely different. But what about using a Phillips screwdriver with a Pozi screw and vice versa?

The rule of thumb is this: you can use Phillips screwdrivers with Pozi screws (meaning the driver will fit the head). However, it’s very possible you’ll experience cam-out and maybe even damage the screw.

What about using Pozidrive screwdrivers with Phillips screws? Pozi drivers just don’t fit Phillips heads. Try and you risk damage to your hardware.

Why So Many Driver Types?

If some screwdriver models are simply superior to others when it comes to preventing cam-out, it’s only natural to wonder why do we need that many types of screwdrivers in the first place.

Some designs just weren’t possible with more primitive technology. In addition, some screwdriver designs are country-specific or only used in certain professions.

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