Sheet Metal Screw

Sheet metal screws, also known as self-tapping screws, are designed to create their own threads as they are driven into materials such as sheet metal, wood, fiberglass, and plastic. Unlike machine screws that require pre-tapped holes, these screws cut or form mating threads during installation, enabling quick and efficient fastening in applications where access is limited to one side.

Point Types

Type	Description
Type A	Sharp, gimlet point with widely spaced threads. Designed for thin sheet metal (0.015″ to 0.050″ thick), light-gauge steel, and non-ferrous metals. Most popular and widely used type
Type AB	Hybrid design combining the sharp point of Type A with finer threads similar to Type B. Offers versatility across a broader range of materials, including thin sheet metal and softer substrates
Type B	Blunt point with finer threads. Designed for thicker sheet metal (0.050″ to 0.200″ thick), plastics, and softer metals. Provides improved holding power in these materials

Applicable Standards

Standard	Description
ASME B18.6.4	Thread forming and thread cutting tapping screws – inch series
IFI 113	Tapping screws – general requirements and dimensional data

Materials

C1022 Hardened Steel (zinc plated)
Stainless Steel 304 (A2)
Stainless Steel 316 (A4)

Surface Finishes

Zinc Plating
Passivation (stainless steel)

Available Head Styles

Head Type	Description
Pan Head	Flat bottom with rounded sides; provides low-profile yet wide bearing surface. Most common general-purpose head
Flat Head (Countersunk)	82° countersunk angle; sits flush with the surface for a smooth, clean finish
Hex Washer Head	External hex drive with integrated washer; allows high torque without cam-out and provides increased clamping force