Taper-length drill bits have an increased cutting length compared to jobbers. The bit’s shank diameter and flute diameter are the same. Taper-length drill bits and longer bits are used for specialty work like aircraft repair and production, vehicle modification, and construction.

The shorter the drill bit, the more rigid it stays and the easier it is to drill an accurate hole. But another drill bit quality that contributes to its suitability is the material it’s made from. The most common twist drill bit materials are high-speed steel, cobalt steel, carbide, and titanium.

High-speed steel (HSS) drill bits are made from steel, tungsten, and other metals. Cobalt steel drill bits contain more cobalt than other bits, making them more durable and heat resistant. Carbide drill bits have a combination of tungsten carbide and cobalt; they’re extremely hard and can drill through tough materials like cast iron.

Quarter-inch hex shank bits are intended to be used on 1/4-inch impact drivers and can be quickly changed. SDS (slotted drive system) shanks are used for concrete drills and demolition bits and work specifically with SDS-Plus and SDS-Max rotary hammer drills.

Used to drill larger thru-holes in metal (7/16″ and up), these bits require a special machine. Similar to a hole saw, annular cutter bits cut the outer diameter of the hole and leave a solid center slug.

Spade bits have a spade-shaped tip that allows them to bore into softwoods. They are typically used to create holes for running cables.

These are what you use when looking to bore smooth and clean holes into the woods. This bit also comes with a pointed tip to allow for easy positioning of the bit.

Black Oxide: The most economical coating. Black oxide adds corrosion protection, increases tempering and stress relieving of the bit, reduces galling and chip welding, and aids in retaining drilling lubricants. Black oxide is suitable for drilling iron and steel but is not recommended for drilling aluminum, magnesium, or similar materials.

You can also determine the size of the drill bit based on the screws you want to use. The diameter of the hole you drill should be slightly smaller than the diameter of the screw. So, for example, if you’re using a 3.5 mm screw, use a drill bit with a diameter of 3 mm.

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This creates a much more efficient drilling process with burr-free holes in tubing, sheet metal, and iron bar stock. Annular cutter bits on our site are made from Cobalt High-Speed Steel.

Things You Should Know1. A wood drill bit has a pointed spur on the tip. A metal drill bit comes to a blunt point.2. Metal drill bits may have a black or gold coating. Wood drill bits usually have a shiny silver finish.3. It’s safe to use a metal drill bit for wood but it may create rough edges around the hole.

These bits have a special design that allows them to drill a hole into a material with the purpose of extracting its core.

Brad-point bits come in handy when you need to make clean and precise holes. They come with rubber stoppers to allow you to set a particular depth. Their precision makes them a popular bit among woodworkers.

Typesof drillbits and their uses

Length is not the sole determiner of a drill bit’s strengths and limitations. Another important consideration when choosing the right drill bit length is the tool’s geometry. Geometries of drill bits include the point angle, helix angle, and lip relief angle.

Titanium drill bits do not contain titanium throughout the drill bit. Instead, they are typically made from HSS or cobalt steel and have a thin titanium nitride coating. The coating improves wearability and reduces friction while drilling.

The lip relief angle, also called the lip clearance angle, is created by the cutting lip with the drill bit’s axis. The lip angle determines the force required to start and continue cutting, the swarf’s shape and size, and the hole’s accuracy and finish.

The helix angle is the angle formed between the centerline running the length of the bit and the line of the flute. Most twist drills have a helix angle of about 30 degrees.

Bronze Oxide: Bronze oxide increases tempering and stress relieving of the bit and is generally used alone to visually identify cobalt steel or with black oxide to identify better grades of high-speed steel.

High-speed steel (HSS) drill bits can drill wood, fiberglass, polyvinyl chloride (PVC) and soft metals such as aluminum. Cobalt drill bits are extremely hard and dissipate heat quickly. They’re mostly used for boring in aluminum and tough metals such as stainless steel.

Twist drill bits are available in standard lengths, which you can compare below. Longer drill bits can be more challenging to work with. Additionally, the greater the drill bit’s length compared to its diameter, the more technical skill it takes to drill an accurate hole.

Once you’ve chosen the appropriate drill bit length for the job, compare drill bit materials to get the best results. A 12-inch HSS aircraft extension bit can drill holes in places that are normally hard to access. But a 12-inch cobalt bit is a super high-grade, premium bit that can cut through weld seams and most hardened metals, including bronze and titanium.

When it comes to drills, there are two easily identifiable parts you need to know about – the shank and the chuck. Here’s a little information to help you understand more about how drills and drill bits work:

The chuck is the part of the drill that attaches the drill bit. Most power drills for home use have a 3/8-inch or 1/2-inch chuck. Larger chucks come in 5/8-inch and 3/4-inch sizes but are usually fitted on heavy-duty and industrial power drills and drill presses.

These are the bits to use when looking to drill into thick and dry wood. Thanks to their innovative design, you do not have to apply a lot of pressure when drilling into tough materials. Auger bits have a screw tip that creates the initial hole for the rest of the bit to fall. As a result, holes by auger bits are incredibly clean and precise.

A twist bit is the most common type of drill bit for home use. It works for general-purpose drilling in wood, plastic and light metal.

Most drill bit sets are sold in a case with space to hold each bit in place. This keeps the drill bits from being nicked or scratched and also provides excellent organization. Each spot is marked for the bit’s size and type, making it easy to quickly find the right bit for the project you are completing.

Drill bits are designed to drill holes in a variety of different common materials. These include different types of wood, metal, plastic, ceramic tile, porcelain, and concrete. Drill bits made for steel, aluminum, copper, cast iron, sheet metal, fiberglass, brick, vinyl flooring, and more are also available.

If your set didn’t come with a case or you’ve been buying individual drill bits, add a storage box with dividers to your toolset. Don’t store more than two bits together and use a permanent marker to mark each space with the size and type of drill bit stored there.

Proper drill bit maintenance is not much different from maintenance for most tools, and it helps prolong the life of your drill bits and keeps them ready for the next job. Caring for your drill bits can also be a matter of safety; dull or damaged drill bits can create problems both in the work and for the worker.

Drill bits are generally classified as Twist Drill, Counterbore, Countersink, Flat Bottom Boring, and Specialty. On our web site we have divided these into two categories: Drill Bits – Normally used with hand held drills or drill presses fitted with standard chucks.

These are special types of bits that can drill through plastic, tiles, glass, marble, and brick. They can also withstand high temperatures.

Also known as high-speed bits, they resemble corkscrews and are some of the most popular bits. They are typically used to drill small holes into wood and walls. Their unique design allows them to channel dust from the hole as they work.

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Titanium Nitride (Tin): A more expensive coating that increases the hardness of the bit and provides a thermal barrier resulting in increased production rates and longer tool life in harder materials. Tin also provides the same benefits as black and bronze oxide. Tin-coated bits are suitable for drilling iron and steel as well as aluminum, magnesium, etc.

Named after their tip that resembles a series of pyramid-shaped steps, these bits are what professionals use to drill into sheet metal. Their stepped design allows you to create holes with varying diameters. Step bits are renowned for their versatility.

The 118-degree angle is less steep, less pointed, and has a smaller chisel; it cuts less aggressively than a 135-degree bit. The 118-degree point angle becomes dull more quickly when used to cut harder materials, so the 135-degree point angle is typically used for drilling into harder materials due to its sharper point.

Typesof drillbits for metal

Sized for their diameter, drill bits are constructed in a range of styles to help with specific tasks. Not sure which drill bit you need or what you need in your toolbox? Keep reading for a rundown of the different types of drill bits you’re likely to come across.

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Plug cutters are helpful in professional projects, as they drill holes into the wood while cutting the wood plugs you require to hide recessed fasteners.

Like auger bits, self-feed bits also feature a screw tip for positioning the bit. They create clean, precise holes, as well. However, since they do not channel the dust away from the hole as they work, you must halt the operation periodically to clear the dust away.

Typesof drillbits chart

A sharpening tool can be a good investment to keep your drill bits in top shape. More experienced DIYers can accomplish the task with a good set of grinding tools.

Jobber-length drill bits are the most common, and the length of a jobber drill bit is greater than its diameter. This drill is suitable for cutting soft metals. Other factors, such as the drill bit’s geometry and material, can make it possible to use a jobber-length drill to cut hard metal.

Drill bits are cutting tools. If you do a lot of home projects or heavy-duty construction work, periodically sharpening your drill bits will be necessary. Dull drill bits can increase time and effort needed to complete work and possibly damage the materials you’re working on, and may even cause injury.

Always try to use the shortest drill bit possible to avoid breakage and to make an accurate hole. It can sometimes be better to use a short bit to drill on either side of a workpiece than to drill once all the way through with a long bit.

These are what you use when looking to create holes in bricks, stones, or concrete. Due to the tough nature of those materials, masonry bits wear out quickly, meaning that you will need to replace them frequently.

When choosing a drill bit set, go for an HSS, cobalt, or carbide set. These bit types will perform well on different materials and surfaces, including wood and metals. Cobalt and carbide bits are also good for heavy-duty drilling into hard steels, metals, and concrete.

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The point angle is the angle of the cutting head at the bit tip. The two most common point angles are 118 and 135 degrees.

As their name implies, these bits can be adjusted to create holes of varying sizes, thus eliminating the need for purchasing bits of different sizes.

The diameter-to-length ratio of a standard drill bit is usually between 1:1 and 1:10, but long series bits, sometimes called aircraft-length, have a much higher ratio. The higher the ratio, the more technically challenging it is to produce good work.

You use a hammer bit to create precise holes into concrete slabs when looking to determine the amount of humidity in a concrete slab.

The length of a drill bit determines how deeply you can drill a hole. The length also affects the bit’s rigidity and cutting accuracy. Longer bits can drill deeper holes, but the drill can wander and create an inaccurate hole because the long bits are more flexible. Continue reading to learn how to choose the right drill bit length.

Long-series drill bits are often used in the same industries that use taper-length drill bits. Craftspeople can use extra-long drill bits to drill lengthwise into house frames and roof beams. The small diameter of these drill bits works well for placing wires and cables at the right depth without excessively large holes, and the long shank is perfect for drilling hard-to-reach areas.

Professionals use installer bits to bore holes for installing wiring for entertainment or security systems. The tip of the bit has a tiny hole where you insert the wire you are looking to pass through the material. Installer bits are incredibly long, reaching lengths of up to 18 inches to facilitate their work.

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The shorter length makes stub-length twist bits very rigid, which helps them drill straighter holes than jobber twist bits. They’re typically limited to drilling about an inch deep into the workpiece material. You’ll find stub-length cutting tools in manufacturing settings and machine shops.

These bits come with carbide tips to allow you to bore holes into tiles without creating chips or cracks in the tile. Different tile bits are designed for different types of tiles. Therefore, ensure that you check its package to confirm that it can drill into your tiles.

The shank is the end of the drill bit that fits into the drill and is secured by the chuck. A round shank helps to center a bit in the chuck more accurately. The flat surfaces on a hex shank allow the chuck to grip the drill bit more securely.

A larger angle is typically used for drilling harder materials like stainless steel. Standard lip angles for twist drill bits are usually between 118 and 135 degrees, but specialized drill bits can have different lip angles.

Shop with Drill Bit Warehouse for high-speed bit sets. We carry lengths from 1/8 inch to 12 inches so you can always find what you need. Shop with us today for essential tools for drilling metal.

A high helix angle, typically 40 degrees or more, rotates around the tool faster than a low helix angle. This characteristic is why high helix drill bits are sometimes called fast spiral angle drills. Generally, the deeper the hole, the higher the helix angle required for effective swarf removal.

To avoid breaking a long drill bit, drill a pilot hole with a shorter bit. Then continue drilling with the extra-long drill bit.

Choosing the right drill bit is key to starting a smooth and accurate project. Use suitable lubricating and cutting oils when possible to improve drill bit performance and extend the tool’s cutting life.

Stub-length screw machine drill bits are shorter than jobber drill bits, the most common drill bit type. Stub drills are used primarily for machining operations in screw machines, drill presses, lathes, and mills, but you can use some stub-length drill bits in manual, hand-held tools.