Fastener Head Types

Here is some information with illustrations to help you identify them.

COUNTERSUNK FLAT

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

COUNTERSUNK RAISED

Primarily used for decorative purposes, they are commonly used in socket boxes.

  Also Known as Oval Head

ROUND HEAD

A tall domed head that sits above the surface into which the screw is driven.

BUGLE HEAD

Specifically designed for drywall applications, the head penetrates the plasterboard without breaking it.

PAN HEAD

A low profile domed head that sits above the surface into which the screw is driven.   

MUSHROOM HEAD 

A wide and slightly domed head that sits aove the surface into which the screw is driven.

           Also known as a Truss Head.

WAFER HEAD

Flat dome head with flange that enlarges the contact surface.

FLANGE HEAD

The flange below the head enlarges the contact surface. 

HEX HEAD

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.

CAP HEAD

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.

BUTTON HEAD

A medium flattened domed head with an internal hex socket drive.