A drill bit is a cutting tool attached to a drill/drilling machine. They almost always have a circular cross-section and sharp cutting points that makes it able to make holes in parts or products. The drill bits are available in a variety of sizes and shapes and can be used to form different types of holes in many different materials.

Core drill bits do not have a cutting point and 3 to 4 flutes. Therefore, they are suitable for drilling into already made holes.

A drill bit is a special tool applicable in drilling holes in/through products and materials. It comes in different shapes, sizes, dimensions, designs, etc. As a result, there are different types of drill bits, each with unique applications.Due to the different drill bit types and unique applications, choosing the right one might be challenging. As a result, this article will introduce the different types of drill bits and their applications in part manufacturing.

Drill bits under this subcategory are suitable for working on metallic materials. The common ones used in part manufacturing include:

Drill bits are a crucial part of part manufacturing, especially in products that need assembly. They come from different materials and have different shapes, sizes, and other factors leading to the different types of drill bits used in the machining process, such as CNC milling, drilling, etc. To help you select the right type, contact WayKen to get more information.

High carbon steel drill bits have higher durability due to the material’s heat treatment and hardening process. Unlike low-carbon steel, they are suitable for drilling through hardwood, metals, and plastic. However, they can lose their cutting edge when overheating.

Drill bits coated in diamonds have the highest hardiness in this category. Consequently, they are suitable for drilling into hard materials such as metals. Also, they are highly accurate and suitable for materials such as glass, sea glass, etc.

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Every type of drill bit is unique. Nevertheless, they have the same parts with little or no alteration. Below are parts common to all types of drill bits used in part manufacturing:

The drill bit has a long shaft but a head shaped like a spade with a needled bit tip. They come in diameter from 6-36 and are suitable for rough boring wood.

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Hole saws are drill bits with short open cylinders with saw teeth on the edge. They are applicable in drilling through thin materials such as wood and sheet metal.

Coatings are important because they can improve the drill bits’ functional and aesthetic value. For example, when high-speed steel drill bits are coated with titanium nitride, they become very hard, increasing their suitability for drilling hard materials. Therefore, check through their properties if you are drilling a hard material and need a coated drill bit.

Titanium drill bits are sharp and stay sharp better than other drill bits. However, sharpening them requires re-coating, which is a huge disadvantage of the drill bits.

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The right drilling bit should be thick enough to avoid snapping during the drilling process. Therefore, you should consider spending more money on heavy-duty geometry.

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They are similar to step drill bits but with a straight running flute. Their design makes them applicable in hole enlarging and, like the step drill bits, ensures efficient ejection of chips during drilling. Unibits are widely applicable in sheet metal fabrication and drilling through soft materials such as plywood.

They are commonly used for making holes in concrete or stones. However, you must often substitute them due to the hard nature of the materials they drill through.

These drill bits are similar to the titanium nitride drill bits. Consequently, they are slippery with a characteristic blue or purple color. However, they have enhanced hardness. As a result, they are majorly applicable in drilling through hard materials.

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These drill bits feature a cylindrical shaft and helical flute. As a result, they are similar to corkscrews and can drill quickly and accurately. The helical flute is a feature that allows them to control dust from the hole as they work.

These drill bits come from tungsten carbide, known for their extreme hardness. Consequently, they are expensive but compatible with virtually all materials. However, due to their high cost, they are mostly designed to be on the drill bit tips.

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Workpieces are made from metal, wood, stone, ceramic, or other materials. Each one has its properties necessitating you choose using the right drill bit. For example, you can use universal drill bits like the twist and step drill bits or the straight flute drill bit for workpieces made from metallic materials. Another example is using an auger and spade drilling bit for woods. Ensure you know the drilling bit’s intended use before choosing them.

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There are several materials used in making different drill bit types. Each drill bit has unique characteristics based on the inherent mechanical properties of the material. Consequently, they have unique applications. Below are the common types of drill bits based on the material used.

The center drilling bit has a tapered and threaded bit tip. It is an important drilling bit for working with wood and involves turning it to bore a hole in the wood. They are made mainly using soft steel and are ideal as a hand tool.

Different types of drill bits are used in part manufacturing and are classified into two main categories: coating and workpiece materials. Below is an introduction to the different drill bits that make up each category.

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High-speed steel comprises tungsten, chromium, carbon, and vanadium. Consequently, these drill bits have higher hardness, strength, wear resistance, and heat resistance. They have the nick High-Speed Steel due to their ability to drill at high speed. They are suitable for drilling metal and hardwood.

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Also known as Slocombe drill bits, these tools are suitable for making starting hole or a conical indentation on the workpiece.

Short drill bits are more rigid, and they deliver higher precision. If you have no choice but to use a long drill bit, ensure that it has a short flute length, i.e., two times the drill diameter. Long drill bits with long flute lengths will have lower stability and the tendency to cut.

The ejector drill bit has a unique design. It is similar to a tube in a tube and has a carbide drill bit tip. They are suitable for making deep holes 19-102 mm in diameter.

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These are expensive drill bits made from carbide or ceramic and are more prominent in CNC drilling. They are wear-resistant and has multiple coolant channel for a prolonged lifespan. They are suitable for cutting holes about five times their diameter and are preferred due to their speeding drilling process.

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Low-carbon steel drill bits are suitable for working with softwoods, plastic, and other soft materials because they cannot hold their edge well.

Many types of drill bits are categorized based on the materials they can make holes. Under this category, we have four common subcategories: universal, metal, wood, and others. Below are the different drill bit types under each subcategory and their applications.

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Cobalt steel alloy contains about a 5-8% cobalt blend making them hard, heat resistant, and brittle. As a result, they are suitable for drilling stainless steel and other hard materials.

Drill bits coated with titanium nitride are hard, fast, have a longer lifespan, and are suitable for drilling hard and soft metal. Due to their properties, they have wide industrial applications. However, the only disadvantage is that it is not restorable when they lose its cutting edge unless the coating is reapplied.

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Drill bits coated with titanium aluminum have high stability and suitability for drilling stainless steel, steel, and other materials at high temperatures. However, they are not suitable for drilling aluminum.

Coatings are materials applied on a part to give it better functional or aesthetic value and are one of the main categories of drilling bits. Below are the types of drill bits that fall under this category.

The drill bit material is important in selecting the right drill bit type. This is because every material has a unique hardness and mechanical features. For example, high-speed steel can drill through fiberglass, PVC, aluminum, and wood, while cobalt drill bits are very hard and disperse heat faster.

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Due to the myriad of drilling bits in the market, selecting the right one might be a challenge. However, you can use the hint below to select the drill bit amidst the market’s different types of drill bits.

Brad-point drilling bits have rubber cork which aids their accuracy to a certain depth. As a result, they are suitable for drilling materials that need a highly accurate hole and are available in 3-16mm diameters. They are suitable for wood and soft plastics.

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Polycrystalline diamond (PCD) drill bits are the strongest. They are considered the hardest drill bits, making them suitable for the toughest materials, such as glass and ceramic.

Step drill bits are suitable for drilling soft materials such as aluminum. Furthermore, due to them being custom-made, they are expensive.

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Glass bits generate high temperatures. As a result, they have short longevity. However, they are applicable in cutting holes at low speed.

Drill bits under this subcategory are suitable for working on other materials such as stones, concrete, and ceramic. The common ones used in part manufacturing include:

There are different drill bit standard sizes, such as the Fractional Inch, Wire Gauge and Letter, and the metric drill bit size. Use a proper drill bit size chart to get the proper size and dimension of the drill bit.

Black oxide is an inexpensive coating applied on high-speed steel. They make the drill bits heat-resistant, rust and corrosion-resistant, and frictionless. Due to the lowered friction, drilling becomes easier. Black oxide drill bits are suitable for drilling steel, PVC, acrylic, maple, nylon, etc., and are considered the best general-purpose drill bits.

Drill bits that fall under this subcategory are suitable for all materials. There are four common universal drill bits used in part manufacturing.

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This is similar to the twist drill bit. However, they have a parallel running flute. Due to the parallel flute, chips don’t pop out during drilling. Consequently, there is a limitation on the industrial application. Nevertheless, they are suitable for drilling soft materials such as brass, copper, etc., and are easy to use.

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The drill bit material is made from diamond particles bonded to a sintered mass of tungsten carbide. Consequently, drill bits made from this material are the hardest. Nevertheless, they have wide applications and are suitable for all materials. Nevertheless, their high cost limits their use industrially.

A step drill bit is custom-made and has a conical shape and a running flute that can be straight or angled. The flute ensures that the chips are ejected during drilling.

The two common drill point angles are 118°and 135°. On the one hand, drill bits with an 118° drill pint angle are suitable for soft materials like mild steel and aluminum. On the other hand, drill bits with a 135° drill pint angle are suitable for drilling hard materials.

Twist drill bits are the most common drill bits with a wide industrial application applicable in drilling holes into wood and walls.

These drill bits make holes in strong and dry wood. With their special design, you don’t need to apply too much pressure when drilling through the thick wood.

The drill bit has a design suitable to work only as a combination router and drill bit. It has a steel shell with a diamond embedded in a metal segment. They are suitable for cutting several materials but at relatively low speeds.

Cobalt drill bits are the most suitable for metals such as stainless steel, aluminum, etc. However, consider other factors, such as size and length, when choosing.