There are many kinds of drill bits out there. Used for a wide majority of drilling jobs, each kind of drill bit has its time and place, essential for boring holes quickly and correctly. Due to the large amount of variety in the drill bit category, however, it is quite easy for hardware beginners or even experts to get lost when looking for the right bit for any one job. To help make your project that much easier, here is everything you need to know about choosing the right drill bit so you can get drilling in no time!
Bits Based on Working Materials
The most important thing to know off the bat is what kind of material you are choosing to cut and bore through. Drill bits are used for a variety of common materials ranging from word, metal, plastic, tile, glass, masonry, and more so it is important to understand that there are different bits for different materials.
Wood Drill Bits are identified by small, pointed tips at the very end and are by far the most used and versatile group of bits. The most common bit, Twist drill bits are useful for general home repairs and building projects with wood. Pilot Point/Brad bits are useful for woodworking due to its uniquely shaped center point that produces a clean exit finish hole, perfect for wood DIY projects. Auger drill bits are large woodworking bits noticeable for their outward spirals and screw-tip that are designed to create clean, deep holes into larger pieces of wood. Spade drill bits are known for their wide, flat blades with a pilot point attached that are useful for drilling large diameter holes in walls for plumbing, electrical, and other woodworking projects. Usually used with a drill press rather than a handheld drill, Forstner drill bits are guided by a wide outside bit rims to create a flat-bottomed hole; the go-to bit for doweling or creating holes with a grommet. Countersink drill bits are cone-line shaped bits that drill conical holes often used to allow heads of countersunk screw or bolts to sit with the base material.
Metal Drill Bits such as Step drill bits are useful for boring pilot holes in sheet metal-based projects. Step bits are specifically useful due to their conical, different step-depth shape which allows users to drill multiple different sized holes without changing the bit.
Tile Drill Bits are unique thanks to their carbide-tipped bit, allowing drilling through ceramic and porcelain tiles without chipping or cracking the base material. The carbide tip allows the bit to maintain its sharp and hard edge for longer, allowing it to cut through thicker materials when used at faster speeds. Since standard drill bits cannot easily cut through tile materials, tile drill bits are more useful for flooring and other tile projects.
Glass Drill Bits are like tile drill bits in their carbide-tipped bits but instead feature wide, flat blades similar to spade drill bits. Commonly used at slower speeds with rotary drills, the hard carbide tip allows the bit to cut through glass without shattering it.
Masonry Drill Bits are thicker, stronger bits with a sloped tip that are used for concrete, brick, or masonry. Another common carbide tip bit, masonry drill bits can be used in power drills, but are best used with a hammer drill for home building and repairs.
Other kinds of drill bits include hole saws, which are attached to a drill shank to cut large holes in wood, metal, tile, and masonry, and screwdriver drill bits which are used for bolts, screws, and a variety of many other materials depending on the tip type.
Bits Based on Materials Used
Aside from basing the drill bit on what material to use it on, drill bits are further
classified based on what materials are used to manufacture them.
Cobalt Drill Bits are known for their ability to withstand high drilling temperatures, allowing the bits to be used at high speeds for drilling into sturdy, abrasive materials such as steel, titanium, and various metals. Highly resistant to abrasions, cobalt drill bits have longer bit life than other materials.
Titanium Drill Bits have a very high surface hardness, allowing for drilling into tough surfaces such as hardwood, softwood, PVC, and fiberglass. Due to their reduced friction, they require much less effort to gore holes with ease.
Carbide Drill Bits are mainly used in concrete, tile, and masonry projects. Carbide drill bits can keep their sharp edge for much longer but can prove brittle if handled incorrectly.
Molybdenum Drill Bits are like cobalt drill bits in the way that they can drill through steel and other abrasive materials relatively easy. Molybdenum drill bits are generally the way to go for strong hand drill bits for mild steel working materials.
Other Useful Information to Know
Sizing of bits is highly important since many bits come in different key sizes. Know the size of your drill chuck and make sure any bit is compatible before you buy.
SDS Drill Bits are not exactly made to work with normal drills. SDS drills, standing for Slotted Drive Shaft, have a hammering action that pounds the drill bit in and out while it spins. Though some normal drills have hammering capabilities in them, the grip of the SDS Drill Bit shank might not be firmly secured, allowing for a loose bit that can damage both the bit and the chuck. Keep in mind the difference between SDS Drill Bits and their variations and their compatibility with the drill you are using.
Drill Speeds are also important for both the working materials you are using to drill into and the drill bit itself. While most heavier materials such as steel and aluminum require higher drilling RPMS, they can also wear down your bits faster than intended. Make sure to check the appropriate RPM for both the work material and the drill bit to ensure longer drill bit life and less possible error on working materials.
Ace Industrial Supply is an industrial equipment supplier in Los Angeles, California. Supplier of drills, drill bits, and more, contact Ace today for top quality brands and more.