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What Is Pozidriv? How Does It Differ From A Phillips Drive?

What Is Pozidriv?Pozidriv bit and Pozidriv screw

Pozidriv, commonly spelled incorrectly as “Pozidrive”, is an improved variation on the Phillips drive design. After the patent for the Phillips head expired, the company GKN Screws and Fasteners created the Pozidriv design.

The Pozidriv drive style was originally formed to address the largest issue Phillips heads are prone to: cam-out. Cam-out is defined as the slipping out of a drive recess that occurs when torque exceeds a certain limit. The Pozidriv drive style has the same self-centering design of a Phillips drive style but improves upon the two following factors:

  • Increased torque without cam-out
  • Greater surface contact engagement between the drive and the recess in the fastener head making it harder to slip when installed correctly

Can I Use a Pozidriv on a Phillips Screw? Or Vice-Versa?

While we at Albany County Fasteners do NOT recommend using the improper drive style on a screw, technically speaking you can. A Phillips drive style fits into a Pozidriv drive recess decently when using the right size. It’s important to note that even if the Phillips does fit snugly into the drive recess, it is still much more likely to strip or cam-out than when using the proper driver.

Alternatively, you can attempt to remove a Phillips screw with a Pozidriv drive but they do not fit into the Phillips drive recess snugly and are much more likely to slip or damage the recess during removal.

Where Are Pozidriv Screws Used?

Pozidriv screws can be used just about anywhere, although they are not nearly as popular as standard Phillips screws. Over the years, many other drive styles, such as the Torx and Robertson, have come out as being more reliable than the Phillips drive style at preventing cam-out and stripping. The Phillips drive is still extremely popular in manufacturing due to its self-centering design but is starting to lose popularity for manual applications due to other drive styles having a better design.

Benefits of the Pozidriv Drive Style

As an improvement on the Phillips drive style, the main benefit of using the Pozidrive is the increased torque without the increased risk of cam-out. Pozidriv screws can handle significantly more torque on the fastener recess than a Phillips drive can.

How Do You Identify A Pozidriv Screw?

While Phillips and Pozidriv screws look similar, Pozidriv are actually quite easy to recognize at a glance. This is due to four notches marked into the head of the Pozidriv screw that are not present in the Phillips Head Screw.

Phillips Pozidriv
Phillips Drive Recess Profile Pozidriv Drive Recess Profile



Pozidriv Screwdrivers

The Pozidriv drive style can be found in a range of sizes from 0-5. The letters PZ or PSD are usually listed before the size number (e.g. PZ3 or PSD5). ANSI standards refer to Pozidriv as a “Type IA”. The Pozidriv style can be found in two forms. Either as a Pozidriv screwdriver or as a Pozidriv screwdriver bit. We currently carry Pozidriv driver bits in several different sizes in the following Vega Bit Kits:

Pozidriv vs.

Phillips

The Pozidriv is an improvement on the Phillips drive by increasing its torque capacity without increasing the likelihood of cam-out. It also has greater surface area contact with the drive recess. This makes it less likely to strip when installed correctly. In general, you can determine if a Pozidriv screw should be used over a Phillips screw by asking the question “How much torque do I need for this installation?” If the answer is a minimal amount of torque, the Phillips drive will work, otherwise, use the Pozidriv. As an improvement on the original Phillips style, the Pozidriv style is better than the Phillips.

Torx

The Torx, or Star, drive style vastly changes the design of the drive recess. Due to the star having six points of contact (6-Lobe), the screw uses a truly radial force rather than an axial force. Phillips and Pozidriv screws use an axial force to drive the screw which is not as effective and is more likely to cause cam-out. For manual applications, Torx screws are quickly becoming the most popular choice.

ROBERTSON

The Robertson, or square, drive is quite common especially throughout Europe. The square drive offers a unique style as it must fit perfectly into the drive recess to drive properly. When it comes to Robertson vs. Pozidriv styles for manual applications, the Robertson is the winner. However, the square drive is not nearly as popular as the star drive style.

Conclusionpozidriv screw and pozidriv insert bit from Vega set

While the Pozidriv drive style is an improvement upon the Phillips drive style, the Phillips is still incredibly popular and does not seem to be going anywhere any time soon.

Should you be in the manufacturing field and find you are having trouble with cam-out, you may want to attempt a Pozidriv configuration. It will give you the added benefits of a reduced cam-out with a better fit into the drive recess while preserving the self-centering functionality that is a must for manufacturing. For manual applications however, both the Star and Square drives are better choices to better suit your needs.



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