How To Size Sheet Metal Screws

Teks 9 x 1 1 2 in.

How to size sheet metal screws.

For example 5 0 means the screws have a diameter of 5 mm. If the metal is thicker and harder thread cutting screws are used. Screws with a diameter smaller than 1 4 have a nominal size indicated by a number e g. Hex head roofing screws provide secure metal to metal fastening with strong holding power without the need to pre drill.

Regardless of the material the driving point needs to be larger than the depth of the material being driven into. These rivets feature more girdles on top which help in providing a more finished appearance. 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.

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. If the screw size includes a dash with a number following it that is the number of threads per inch tpi. 1 4 and larger diameters are shown as inches. Decimal nearest fractional 4 112.

Sizes typically range from 2 to 3 8. Hex head roofing screws teks 9 x 1 1 2 in. The diameter refers to the major diameter or outside edge of the threads. Jetovo 150 pack 410 stainless steel wafer head phillips self drilling screws sheet metal tek screws assortment kit modified truss head self driller size.

Print this page. This is how the diameter is represented for screws in the metric system. Their heads can be either phillips head or slotted head. The engineered drill point and flute remove material efficiently and properly size the hole for threads.

If you have some stray screws and bolts a k a. If you re buying screws with the measurements listed on the packaging in the metric system then the first number represents the diameter. Consequently burrs are common. These screws are also available in stainless steel and also in zinc plated.

Types a and ab are usually considered interchangeable.