Hole Sizes For Sheet Metal Screws

Types ab b self tapping screws in mild steel brass aluminium alloy stainless steel and monel sheet metal.

Hole sizes for sheet metal screws.

Life while installing shelving in my home i had to drill pilot holes for 8 and 12 metal screws into studs. Sizes of 4 40 to 3 8 16 are common. 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 size slightly larger may have to be used and in very soft material a smaller hole. Standard screws will need to have a pilot hole drilled in order to prevent splitting within the materials being fixed together.

Size 12 5 32 inches. 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. Decimal nearest fractional 4 112. Zinc white metal etc.

Self drilling screws also called teks have a tip that resembles a drill and often have spaced threads like 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 hole size hole size suggested hole sizes for types a. Tap and drill size chart standard tap size. Your pilot hole drill bit size will depend on the size of your sheet metal screw.

Screw size tpi gauge us std inches hole size hole size drill size gauge b s inches hole size hole. Step 4 drill correctly. Size 8 1 8 inches. Size 14 1 4 inches 3 16 inches.

Type ab b tapping screws approximate hole sizes sheet steel sheet aluminum metal thickness pierced hole drilled or clean punched hole metal thickness pierced hole drilled or clean punched hole castings of aluminum nom. Size 6 7 64 inches. A size 4 screw should have a pilot hole drill size of 3 32 inches. After a hole has been tapped by a thread cutting screw it can be replaced by a machine screw of the same size diameter and number of threads per inch.

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. Pilot hole sizes for metal screws and wood screws posted 30 january 2010 at 9 43pm by michael chu filed under. Size 10 9 64 inches. And 5 16 inches 1 4 inches.

Us sheet metal screw diameters. In case you need to drill a hole and thread it for a screw or bolt.