What size is a sheet metal screw?

Sheet metal screws commonly range in size from #2 to #14 in diameter; some head styles are also available in 5/16″ and 3/8″ sizes. Typical lengths, specified in fractional inches, span from 3/16″ to 3 1/2″.

What type of screws do you use for sheet metal?

There are two basic types of sheet metal screws, self-tapping screws and self-drilling screws. Self-tapping screws have a sharp tip that is designed to cut through metal, but the metal must be pre-drilled before these screws can be used.

What size hole do I drill for a 10 sheet metal screw?

Your pilot-hole drill-bit size will depend on the size of your sheet-metal screw. A size-4 screw should have a pilot-hole drill size of 3/32 inches; size 6, 7/64 inches; size 8, 1/8 inches; size 10, 9/64 inches; size 12, 5/32 inches; size 14-1/4 inches, 3/16 inches; and 5/16 inches, 1/4 inches.

What are the two 2 types of sheet metal screws?

The two main types of sheet metal screws are self-tapping and self-drilling, each having many features to choose from. Self-tapping screws are ideal for jobs that have pre-drilled holes.

Are sheet metal screws strong?

In short, if you are attempting to attach sheet metal, you should choose metal screws. They are easier to drive into metal and will offer a greater level of strength and security. On the other hand, wood screws are better suited for applications involving plywood, lumber, and other wood materials.

What diameter is a #12 sheet metal screw?

US Sheet Metal Screw Diameters

Do you need special screws for sheet metal?

— sheet metal is both harder and stronger than wood. As a result, it requires the use of special screws. You typically can’t drive a conventional screw into sheet metal.

What size hole do I drill for a #8 sheet metal screw?

Typically, you would use a slightly larger drill bit diameter for a tapered pilot hole. The closest match you can get to the diameter of a #8 screw without the threads is a 1/8” straight drill bit. This number translates to 0.125” or 3.175 mm.

What size is a 12 screw?

12-24 Threads The number “12” is used as a size designator with no numerical meaning. “24” references the 24 threads per inch. You can identify a 12-24 screw by measuring the diameter with a ruler at slightly less than 7/32 inches (5.6mm).

What is a common use for self starting sheet metal screws?

Self-tapping screws also work for surfaces where you can’t secure the rear end with a nut. Common applications include fastening aluminum sections, attaching metal brackets onto wood, or inserting screws into plastic housings.

Are sheet metal screws OK for wood?

In a bind, if you’re short of the right available screws, you can use a sheet metal screw on wood. However, the opposite is not the case. Wood screws are unlikely to form a tight enough joint when used on sheet metal – especially if they have a threadless shank.

What diameter is a 14 gauge screw?

Screw Gauge Number vs Diameter