Five Types of Metal Drill Bits
Twist
One of the first types of metal drill bits is the twist variety. The front edge is responsible for cutting the material. Twist bits also have spirals along the length of the bit. These spirals are designed to remove debris from the created hole and to help keep the bit straight. These metal drill bits can be used on metal, plastic, timber, and other materials. Twist bits can be made from high speed steel or carbon steel. High speed steel is more effective when used on metal, while carbon steel are appropriate for drilling wood.
Masonry
There are also masonry bits. These metal drill bits are designed to work with stone, concrete, brick, and other masonry materials. The bit is tipped with tungsten carbide in order to drill the masonry materials effectively. You need to use these metal drill bits at slower speeds to avoid overheating. You also need to remove the bit frequently in order to remove dust.
Countersink
One of the next types of metal drill bits is the countersink. These bits are used to widen holes so that countersunk screws can sit below the surface. These metal drill bits should only be used on soft materials like plastic or timber. You should never use these bits to drill metal.
Tile
Like the masonry variety, tile bits are also tipped with tungsten carbide. These metal drill bits are used to drill glass and ceramic tiles. They also need to be used at slower speeds to avoid overheating. If you use these metal drill bits on glass, you will need to use lubricant to keep the tip cool.
Spur
One of the final types of metal drill bits is the spur point. These bits are commonly referred to as dowel or wood bits. These metal drill bits have two raised spurs that sit beside a central point. Spur point bits create clean-sided holes, so they are commonly used to create holes for dowels. You should only use these drill bits on plastic or wood.
These are some of the most common types of metal drill bits. The most common type is the twist design that can be used on metal, plastic, and timber. You can also use masonry bits to work with brick, concrete, or stone.
