Self Tapping Screws

Self Tapping Screws at great trade prices

Self tapping screws are often referred to as self tappers or PK'S as many of them were originally manufactured by the Parker-Kalon company.

In America they are known as sheet metal screws as they are for use in sheet metal up to 3mm in thickness. Successful installation is dependant on the correct size of hole being drilled or punched to suit both the diameter of screw and also the gauge of sheet metal that screw will be fitted to, this will prevent head shear and make installation effortless.

Self tapping screws are available from Orbital Fasteners in Countersunk Pozi to DIN 7982, Pan Pozi to DIN 7982 and Flange Pozi to DIN 4174, we stock each product in steel bright zinc plated and stainless steel. Steel flange head versions are also available from stock in a black finish.

The most popular selling versions are screws with a sharp pointed end, these are usually known as type AB. Also in use is a version with a blunt end known as a type B, this type are often used in mass production as the blunt ends make them easier to handle and less likely to cause injury. The type B has another benefit, in that they have a little more thread than an AB type of the same length therefore making the use of a shorter screw sometimes possible.

Screw Drive Types

Common to Orbital Fasteners
Pozi Drive Type
Pozi

Pozi is an improved version of the Phillips screw drive. It’s less likely to cam out, which allows greater torque to be applied.

Slot Drive Type
Slot

The slot screw drive has a single slot in the fastener head and is driven by flat head screwdriver.

Phillips Drive Type
Phillips

Most common of all screw drive types. Driven by a Phillips or cross head screwdriver. Prone to cam-out under increased torque.

Torx Drive Type
Torx

Torx is designed to allow increased torque transfer from the driver to the bit compared to other drive systems.

Screw Head Styles

Common to Orbital Fasteners
Countersunk Screw
Countersunk

Most common usage is on screw products where a flush fit is required on the surface.

Raised Countersunk Screw
Raised Countersunk

Most often associated with screw products in exposed applications.

Pan Screw
Pan

Predominantly used on screw products where a flat bearing surface is required where a countersunk is not required.

Cheese Screw
Cheese

Less popular than pan, but again gives a deeper slot capability, is most commonly seen on machine screws.

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