Drilling Holes For Sheet Metal Screws

Drill size hole diameter nominal screw size number of threads per inch 6 18 7 16 8 15 10 12 12 11 14 10 20 9 24 9 32 30 29 21 3 16 5 5mm l 11 32 1160 1285 1360 1590 1875 2165 2900 3438 drill size hole diameter suggested hole sizes for types ab b 25.

Drilling holes for sheet metal screws.

In a single time saving operation these screws drill tap and fasten. For a clearance hole use a 11 drill bit. Slotted hex head zinc plated sheet metal screw 100 pack model 801472 6 25 6 25. Do not use self drilling screws in blind holes holes that do not pass through the material.

Use self drilling screw store fasten materials to aluminum or sheet metal up to 7 ga. Self drilling screws also called teks have a tip that resembles a drill and often have spaced threads like sheet metal screws. Menu of self tapping screws. The tip size is designated 1 through 5 to indicate the thickness of sheet metal the screw will penetrate.

Self tapping screws recommended hole and drill sizes. Types ab b self tapping screws in mild steel brass aluminium alloy stainless steel and monel sheet metal. In case you need to drill a hole and thread it for a screw or bolt. While installing shelving in my home i had to drill pilot holes for 8 and 12 metal screws into studs.

I didn t want to make the pilot holes too big because i wanted the shelves to be as sturdy as. Tap and drill size chart. Set your store to see local. It can depend on the screw and the material you are screwing into.

The problem was i didn t know how big to drill the holes and when the holes were too small it was quite difficult to drive the screws into place. Sheet metal screw to drill bit size table screw size drill bit size 2 3 32in 4 1 8in 6 5 32in 8 3 16in 10 13 64in 12 1 4in 1 4in 9 32in 5 16in 21 64in 3 8in 25 64in. Simply sandwich the sheet metal between two pieces of wood and clamp everything down on a table or workbench. For clean precise holes in thin sheet metal make a wood sandwich.

The wooden bread layers of the sandwich keep the sheet metal flat and prevent the drill bit from wandering as it bores through the sheet metal. Whether you choose a hex head screw or a pan head screw depends on the fastening tool and the desired appearance. Without the need of a pilot hole. Hex washer head sheet metal screws.

Look at the screw and see the diameter of its core root without the threads. For threading you will use a smaller drill bit. Set your store to see local. Self tapping screws sheet metal.

It is important that the correct hole size is used and the recommendation below should be followed but if very hard material is being used a hole.