How To Size Sheet Metal Screws

If the screw size includes a dash with a number following it that is the number of threads per inch tpi.

How to size sheet metal screws.

Us sheet metal screw diameters. The engineered drill point and flute remove material efficiently and properly size the hole for threads. Sizes typically range from 2 to 3 8. These rivets feature more girdles on top which help in providing a more finished appearance.

These screws are also available in stainless steel and also in zinc plated. 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. Print this page. Types a and ab are usually considered interchangeable.

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. The oval head types of sheet metal screws resemble the regular flat head screws but have slight variation. Types a and ab which have a standard point and blunt point type b are common sheet metal screws.

The diameter refers to the major diameter or outside edge of the threads. Hex head roofing screws teks 9 x 1 1 2 in. Consequently burrs are common. Jetovo 150 pack 410 stainless steel wafer head phillips self drilling screws sheet metal tek screws assortment kit modified truss head self driller size.

If the metal is thicker and harder thread cutting screws are used. Hex head roofing screws provide secure metal to metal fastening with strong holding power without the need to pre drill. If you re buying screws with the measurements listed on the packaging in the metric system then the first number represents the diameter. If you have some stray screws and bolts a k a.

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. Screws with a diameter smaller than 1 4 have a nominal size indicated by a number e g. Teks 9 x 1 1 2 in. Decimal nearest fractional 4 112.

Regardless of the material the driving point needs to be larger than the depth of the material being driven into.