How To Size Sheet Metal Screws

Their heads can be either phillips head or slotted head.

How to size sheet metal screws.

Types a and ab which have a standard point and blunt point type b are common sheet metal screws. Sheet metal screws were originally designed for metal like for use in a b vent pipe but can be used for a number of other applications too they can be used with plastics rubber or plywood. Us sheet metal screw diameters. Regardless of the material the driving point needs to be larger than the depth of the material being driven into.

If the screw size includes a dash with a number following it that is the number of threads per inch tpi. If the metal is thicker and harder thread cutting screws are used. Fasteners lying around and aren t quite sure what size they are or if you need to replace a missing bolt on a piece of machinery and need to know what size to get here are some methods to easily figure that out. Sizes typically range from 2 to 3 8.

These rivets feature more girdles on top which help in providing a more finished appearance. This is how the diameter is represented for screws in the metric system. Teks 9 x 1 1 2 in. The diameter refers to the major diameter or outside edge of the threads.

Types a and ab are usually considered interchangeable. The engineered drill point and flute remove material efficiently and properly size the hole for threads. Screws with a diameter smaller than 1 4 have a nominal size indicated by a number e g. These screws are also available in stainless steel and also in zinc plated.

Decimal nearest fractional 4 112. For example 5 0 means the screws have a diameter of 5 mm. Consequently burrs are common. Hex head roofing screws teks 9 x 1 1 2 in.

If you have some stray screws and bolts a k a. The oval head types of sheet metal screws resemble the regular flat head screws but have slight variation. 8 x 1 2 8 x 3 4 8 x 1 by jetovo 12 99 12. 1 4 and larger diameters are shown as inches.

Print this page.