Pilot Drill Size For Sheet Metal Screws

Self tapping screws sheet metal.

Pilot drill size for sheet metal screws.

Twist bit nearest size in fractions of an inch. Life while installing shelving in my home i had to drill pilot holes for 8 and 12 metal screws into studs. In a single time saving operation these screws drill tap and fasten. 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.

Material thickness inch nominal screw size diameter tpi. Sizes of 4 40 to 3 8 16 are common. That allows for us to accommodate both the softer material and the non tapered screw tip. Size 12 5 32 inches.

Drill gauge no to be used for. No of auger bit. Pilot hole sizes for metal screws and wood screws posted 30 january 2010 at 9 43pm by michael chu filed under. Your pilot hole drill bit size will depend on the size of your sheet metal screw.

Twist bit nearest size in fractions of an inch. To help my readers out i thought i would add this quick reference chart. Size 6 7 64 inches. Size 8 1 8 inches.

Size 10 9 64 inches. With that being said you may need to go up more sizes depending on other factors. Bit or drill sizes. And 5 16 inches 1 4 inches.

Types ab b self tapping screws in mild steel brass aluminium alloy stainless steel and monel sheet metal. Drill gauge no or letter to be used for maximum holding power. Do not use self drilling screws in blind holes holes that do not pass through the material. Inch approx us gauge material.

For instance a non tapered brass screw that s size 6 would use 3 32 drill bit for softwood 7 64 drill bit for hardwood. There is nothing more aggravating when you just don t know what size drill bit to use for a pilot. A size 4 screw should have a pilot hole drill size of 3 32 inches. To counterbore for striking head.

However there are times when sheet metal screws are required. This should help whenever you run into a situation you need to drill a pilot hole and are not sure the size bit. Self drilling screws also called teks have a tip that resembles a drill and often have spaced threads like sheet metal screws. Sheet metal screws 100 our trucks deliver throughout se sw florida to place an order please call customer service at 1 800 226 5555 or fax to 800 582 6110 nominal screw size number of threads per inch 2 32 3 28 4 24 5 20 6 20 7 19 8 18 10 16 12 14 1 4 14 5 16 12 3 8 12 48 46 44 36 32 30 29 21 3 16 5 5mm i 21 64 0760 0810 0860 1065 1160 1285.

Size 14 1 4 inches 3 16 inches.