Fastener Head Types
A variety of fastener head types exist and the choice you have depends on what you are fixing. This blog sets out the most common types.
Here is some information with illustrations to help you identify them.
Driven into a countersunk hole these give a flush finish to the surface into which the screw is driven.
Also known as a Flat Head
Primarily used for decorative purposes, they are commonly used in socket boxes.
Also Known as Oval Head
A tall domed head that sits above the surface into which the screw is driven.
Specifically designed for drywall applications, the head penetrates the plasterboard without breaking it.
A low profile domed head that sits above the surface into which the screw is driven.
A wide and slightly domed head that sits aove the surface into which the screw is driven.
Also known as a Truss Head.
Flat dome head with flange that enlarges the contact surface.
The flange below the head enlarges the contact surface.
Hexagonal head used mainly with larger fasteners such as bolts.
HEX FLANGE HEAD
As with the Hex Head and has a flange under the head which enlarges the contact surface.
HEX FLANGE HEAD WITH BONDED WASHER
Has an additional bonded washer which gives a weather tight seal.
A cylindrical head which sits above the surface that may be smooth or knurled. These have an internal hex socket drive.
Also known as socket screws.
A medium flattened domed head with an internal hex socket drive.