What is a Drill Bit? Types of Drill Bits

Drill and drilling equipment are used to bore circular holes in various jobs. A drill is the tool used to bore the hole. What you use to move the drill is referred to as a “drill machine”. It is called drilling when you use a drill or a drill machine to make holes.

Using a drill bit, you may create or expand holes in metal. These go with a drill or drill press that has a chuck on it. A key is used to tighten or loosen the clamp on these drilling machines.

As one of the most useful tools in any workshop, a drill is a must for nearly every task. There are a few things to keep in mind before you start using any types of drill bits. There are many different sizes of drill bits available on the market.

Drill Bits are made of what?

Twist drills are made from the following materials:

  • Stainless Steel or Carbon Steel one-piece construction.
  • Carbon steel, with a minimum tensile strength of 70 kg/sq mm for the cutting part and high-speed steel for the shank.
  • Due to their higher cutting effectiveness, high-speed drills are more commonly employed.
  • Cement-carbide drills are also utilised in mass production.

Drill Bits Application

Drill bits are designed to work with a variety of materials. Different types of wood, metal, plastic, porcelain and concrete are all used in this project. Steel, aluminium, copper, cast iron, sheet metal, fibreglass, masonry, vinyl flooring, and more can all be drilled using certain drill bits.

Drill bits come in a variety of shapes and sizes depending on their diameter. Using step drill bits, you can create any surface (depending on the thickness of the material). A cobalt-type drill bit can also be used to create holes in high-tensile metals.

Types of Drill Bits

Drills are versatile equipment that may be used by anyone from a do-it-yourselfer to a skilled craftsman. However, it is critical that you use the suitable drill bit to avoid damaging the material you are drilling into.

The most common drill bits and their applications are listed below. Learn more about the many types of drill bits and which one is best for your job by continuing reading this article.

1- Twist Drill Bits

When it comes to drilling holes, today’s tools include twist and thick drills. High-speed steel and thin alloy steel rods are the most common materials for these.

Twist Drill Bit

Twist Drill Bits

Features

  • Material: High Speed Steel
  • Cutting Diameter: 0.38 Inches
  • Finish Type: Black and Gold Oxide
  • Shank Type: Round with Flats
  • High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
  • Gold and black surface treated for use in stainless steel and other hard metal drilling
  • These round shank tools have flats ground onto three sides to reduce slippage of the bit when used in drill chucks
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Heavy duty 135 split point for self-centering and reducing thrust

A flute is a twisted groove cut from the top to the bottom of a tool with a cutting edge on one end and a twisted groove on the other. Twist drills are known for their fluted design. Main components include the tang (shank), shank (body), point, and neck.

2- Brad Point Drill Bits

When you need to drill small, precise holes, you’ll want to use a brad point bit. They’re equipped with rubber stoppers so you may dial in the depth to your liking.

Brad Point Drill Bits

Brad Point Drill Bits

Features

  • Material: High Speed Steel
  • Item Dimensions LxWxH: 3.88 x 0.5 x 7.75 inches
  • Tool Flute Type: Spiral
  • Surface Recommendation: Wood
  • Precise cutting edges of the drill bits for wood or metal are designed to reduce splintering
  • Brad point tip of drill bits reduces walking
  • Drill bit set is engineered flutes for clean effective chip removal

They are a favourite among woodworkers because of their high level of accuracy.

3- Flat Drill

Beaten skinny sticks of high carbon steel are commonly used to make this style of drill. The cutting edge of these blades is ground, toughened, and tempered before being used. All shapes and sizes are easily achievable. After forging, these are available in a variety of sizes. These drills can be had at a very low price.

Flat Drill

Flat Drill

Features

  • Weight: 247g
  • Material: Metal
  • Shank Type: Hex
  • Surface: Stone
  • Overall Length:151mm/5.94
  • Product Name: Spade Drill Bit
  • Color: Gray;
  • Total Weight: 247g;Material:Metal
  • Handle Size: 8 x 58mm/0.31″ x 2.28″(D*L);Overall Length:151mm/5.94”
  • Shank Type: Hex Shank; Each
  • Max Width:10mm,12mm,16mm,18mm,20mm,25mm
  • Package Content: 6Pcs x Spade Drill Bit

Boring holes in iron isn’t something you’d do with it. Boring soft metals and wood is a common application. A 90° angle is maintained on the cutting edge. This drill can be used on solid metals when other drills break if they are suitably hardened and cooled.

4- Straight Fluted Drill

As the name suggests, a straight-fluted drill has flutes that run perpendicularly to the axis. Drills with no rakes can be considered straight fluted. This type of drill isn’t commonly used because the chips don’t instantly fall out when it’s used.

Straight Fluted Drill

Straight Fluted Drill

Features

  • Material: Carbide
  • Shank Type: Straight
  • Item Dimensions LxWxH: 4.9 x 0.3 x 2.4 inches
  • Tool Flute Type: Straight
  • Single Flute allows for faster feed rates
  • For window and door cutouts in abrasive insulation materials, plywood, and paneling
  • Drill-through pilot for guiding on templet or framing after panel has been mounted
  • Micrograin Carbide tip provides superior wear resistance and long life

Brass, copper and other softer metals are the primary targets for these drills. If the drill feed rate is quicker than the twist speed when drilling brass, the drill will penetrate the metal. Straight fluted drills don’t have this problem.

5- Countersinking Drill

Countersinking is the process of drilling countersinking holes in the areas where countersinking screws are to be inserted. In this manner, the screw’s head work fits well.

Countersinking Drill

Countersinking Drill

Features

  • Material: Alloy Steel
  • Finish Type: Nickel
  • Item Dimensions LxWxH: 7.76 x 3.88 x 0.75 inches
  • Tool Flute Type: Spiral
  • The product is 3PC Countersink Set
  • Easy and simple use kit
  • The product is manufactured in China
  • Drill, countersink and counterbore in one step
  • Four cutter countersink and tapered drill bit provide superior speed and ideal finish
  • Replacement tapered bits offered

This is a drill with four flutes that is multi-fluted. It has a 60° or 82° grinding angle on the cutting point. This sort of drill and a screw inserted into a drilled hole are depicted in the figure.

6- Counter Boring Drill

This drill is used to perform counterboring prior to the installation of Allen screws. Counter screws are also used to attach these screws to the job’s surface. It can be used to make a hole larger. The height of the screw head is used as a reference point when drilling a hole.

Counter Boring Drill

Counter Boring Drill

Features

  • Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys
  • Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications
  • Round shanks allow use with a wide variety of tool holding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • 3 flutes

The work surface is left as-is for the purpose of screwing in this type of screw. The screw heads are not a problem for their operation.

Countersinking involves cutting the hole at a 60° or 82° angle from the top, whereas counterboring involves making the hole deeper by increasing the size until it reaches the height of the screw head. This is an important distinction.

A counterboring cutter is another name for the drill used to do the operation. The lower half of a pilot is constructed. To ensure a straight counterbore, a pilot is inserted into the hole to aid in setting it straight.

7- Oil Hole or Tube Drill

When drilling a hole, coolant or lubrication is required to keep the drill tip from losing its cutting ability due to heat.

Oil Hole or Tube Drill

Oil Hole or Tube Drill

Features

  • Material: High Speed Steel
  • Cutting Diameter: 0.77 Inches
  • Finish Type: Black Oxide
  • Shank Type: Morse Taper
  • Cutting Angle String: 118 Degrees
  • High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
  • Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge
  • Morse taper shank allows the tool to be inserted directly into the machine’s spindle to facilitate high-torque applications such as large cut diameters
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • It features coolant passages throughout the length of the body

For lubrication up to the cutting point, drills other than standard ones have a hole drilled from the shank to the cutting point.

8- Spirec Drill

These drills are extremely delicate. Spray pump nozzles, storage nipples, and other small parts need tiny holes boringed using these.

Spirec Drill

Spirec Drill

Features

  • Material: Metal
  • Shank Type: Straight
  • Tool Flute Type: Spiral
  • Parameter: Bit Diameter:1.2mm / 0.05 inch; Shank Diameter: 1.2mm / 0.05 inch.
  • Material: Twist Drill is made of high speed steel,High speed steel construction is designed for durability and extended tool life.
  • Feature: Heat Treatment can increase the hardness and corrosion resistant of twist drill bit.
  • Application: Perfect for stainless steel, copper, aluminum alloy, as well suit for wood, plastic.
  • Special Design: Fully ground spiral groove design clears particles quickly, decreases friction and heat for faster drilling performance.

From 0.0086″ to 0.0984″ in diameter, they’re available. There are a large quantity of these on hand.

9- Plug Cutter

In professional projects, plug cutters are useful because they drill holes into wood while cutting the wood plugs you need to conceal recessed fasteners.

Plug Cutter

Plug Cutter

Features

  • Material: Alloy Steel
  • Shank Type: Hex
  • Item Dimensions LxWxH: 2.05 x 4.65 x 1.15 inches
  • 3/4″ hex drive plug cutter
  • Hardened steel for long life
  • Tight fit; no glue needed
  • Plug cutters fit in quick change chuck in a drill press
  • Tapered sides and a chamfered end for easy start

10- Tile Bits

Carbide tips on these bits allow you to drill holes in tiles without damaging them. It is necessary to use a specific tile bit for a specific type of tile.

Tile Bits

Tile Bits

Features

  • Material: Carbide
  • Finish Type: Black Oxide
  • Tool Flute Type: Straight
  • PRECISION: Features Bosch’s unique product design with a precision tip to help solve any bit wandering or bit walking
  • QUALITY: This glass and tile set includes a high-quality carbide tip with a reinforced head to reduce stress, prevent bit cracking and the diamond ground cutting edges provide a longer life
  • VERSATILE: Perfect for common applications such as relief holes for glass cutting, bathroom and shower installs, drilling and fastening mirrors, setting concrete screws in tile and many more
  • RELIABLE: The three flat shank provides superior grip on 5 16 in. bits and larger to prevent slippage. The Bosch Glass & Tile bits are easy to use while still providing best-in-class speed so you can get the job done faster
  • INNOVATIVE: Featuring the Bosch branded, innovative geometry allows bits to drill faster. Each bit is clearly labeled so you can select the correct fit for the task. Included drill bit sizes: 1 8 in., 3 16 in., 1 4 in., 5 16 in
  • Precision tip: Solves bit wander and bit walking
  • 4-Piece set with most common sizes

Make sure to examine the package to see if it can drill into your tiles before using it.

11- Adjustable Wood Bit

In order to avoid having to purchase multiple sized drill bits, these sorts of drill bits can be used to make holes of varying diameters.

Adjustable Wood Bit

Adjustable Wood Bit

Features

  • Material: Other
  • Shank Type: Round with Flats
  • Item Dimensions LxWxH: 10.8 x 0.8 x 0.8 inches
  • These wood drill bits have an adjustable cutting blade that can bore a variety of hole sizes
  • Each drill bit can cut 19 different-sized holes in 1/8-inch increments
  • Lock head screw securely holds blade at a desired boring diameter
  • 7/8″ to 3″ diameter
  • 6-1/2″ overall length with an 11/32″ shank
  • Boring range 7/8″ to 3″, overall length 6-1/2″, drill press shank size 11/32″, includes cutters 44233 and 44234 and vinyl pouch
  • Wedge type blade with a lock and slow-feed screw point

12- Hammer Bit

When attempting to measure the humidity content of a concrete slab, a hammer bit is used to drill small, precise holes into the surface.

Hammer Bit

Hammer Bit

Features

  • Material: Carbide
  • Shank Type: SDS-Max
  • Surface Recommendation: Concrete
  • UNIVERSAL: Fits all SDS-max hammers and Hilti hammers with TE-Y/TE-FY shanks
  • DURABLE: Solid carbide head is ideal for drilling masonry and concrete
  • RELIABLE: Stays sharper longer to drill more holes than competitors’ bits
  • ACCURACY: Centric tip guides bit through hard and reinforced concrete
  • SPEED: Inclined side cutters have an aggressive edge for faster cutting

13- Bullet Point Bits

The bullet point bit is the final sort of drill bit on our list. Bits of this particular kind are capable of drilling through wood, plastic, and metal with ease.

Bullet Point Bits

Bullet Point Bits

Features

  • Material: High Speed Steel
  • Shank Type: Straight
  • Cutting Angle String: 135 Degrees
  • Item Dimensions LxWxH: 5 x 3 x 0.21 inches
  • Pilot Point cuts burr free precision holes 4 times faster than regular point drills
  • 7/32″( 0.2188″) Fractional Drill Bit
  • 135 Degree Split Point Right Hand Spiral Straight Shank
  • Parabolic Flute
  • 1 per Card

They are able to produce holes that are extremely precise.

14- Step Drill

A step drill is required for drilling holes in sheet metal. It’s the only tool you’ll need. It has a descending ladder-like aspect. They are, however, more expensive to use than other drill bits, so if you frequently work with sheet metal, this is the right tool for the job.

Step Drill

Step Drill

Features

  • Material: Alloy Steel
  • Finish Type: Titanium
  • Cutting Angle String: 135 Degrees
  • Tool Flute Type: Spiral
  • Hss & Titanium Coating: High-speed steel makes it last longer than others, titanium coating ensure easily cut through iron sheets, aluminum sheets, copper & plastic & wood board and many other types of sheet metal with ease, and it can automatically deburr holes while drilling to keep the drill bit clean.
  • Titanium Coating: Coated with titanium, this step drill set performs well in heat, corrosion and rust resistance.
  • Revolutionary Design: Tri-flatted shank fits into power tools chuck securely and eliminates slip; two-flute design clears chips faster and allows particles to escape easily.
  • Includes 10 STEP SIZES: 1/4″, 3/8″, 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1-1/8″, 1-1/4″, 1-3/8″.
  • A Must-Have for Handyman or Professionals: Perfect for home repairs and light jobs such as drilling holes in plastic, aluminum, copper, iron and many other types of sheet metal (excluding steel or any other harder metal).

Using a step bit, you may drill holes of varying diameters with confidence. These bits can also deburr holes, allowing you to remove the waste.

15- Installer Bit

To install security and entertainment systems, twist drill bits are used to drill holes and install wires. These drill bits resemble auger bits, and they can measure up to 18 inches in length. Drilling through plaster, wood, and some masonry is possible using these tools.

Installer Bit

Installer Bit

Features

  • Material: Carbon Steel
  • Shank Type: Straight
  • Item Dimensions LxWxH: 18.75 x 7.87 x 7.87 inches
  • Tool Flute Type: Straight
  • 82˚ point for fast, smooth drilling in wood
  • Hole in flute for easy wire pulling through walls, ceilings and floors
  • 3-flatted shank prevents slipping in drill chuck and includes hole for wire pulling Hole not included on 12″ length bits
  • Premium high carbon steel construction for extended drilling life in wood
  • 82˚ point for fast, smooth drilling in wood
  • 3-flatted shank prevents slipping in drill chuck and includes hole for wire pulling Hole not included on 12″ length bits
  • Premium high carbon steel construction for extended drilling life in wood

The bit’s tip has a little hole in it. The wire must be forced through the hole once it has been inserted into the tip and drilled into the surface. Take it from the other side and yank it forth.

16- Masonry Bit

These drill bits are used in the construction of brick, stone, and concrete. In spite of how hard these components are, you’ll need to replace them on a frequent basis.

Masonry Bit

Masonry Bit

Features

  • Material: Carbide
  • Item Dimensions LxWxH: 4 x 6 x 0.5 inches
  • Surface Recommendation: Concrete
  • High quality carbide tip for fast cutting and extended life
  • For applications in brick, concrete and block
  • Use with a standard drill
  • Flat shank prevents bit slippage
  • Package includes 5 premium concrete bits to be used with 3/16″ Topcon style masonry screws. For applications in brick, concrete and block. Used by professionals from plumbers to re-modelers

The tip melts if you keep drilling into concrete for a lengthy period of time. Periodically removing the drill bit from the concrete can help to alleviate this issue.

17- Rivet Drill Bit

Unless you work in the construction industry, you probably won’t be able to use these rivets. Using these types of drill bits, you can drill small rivets into thin sheets of metal.

Rivet Drill Bit

Rivet Drill Bit

Features

  • Large head 3/16″ aluminum pop rivets feature a steel shank and a 1/4″ to 3/8″ grip range
  • Washers are made from premium aluminum for consistent performance and reliability
  • Includes two boxes of 250 rivets (500 rivets total), one box of 500 3/16″ washers, and one bag of 6 double sided steel drill bits
  • Kit is perfect for drilling aluminum body panels
  • Features a grip range of .251″ – .375″

18- Glass Bit

Glass, plastic, composites, brick, marble, and hollow brick can all be drilled through with this type of drill bit. Drilling into deep material is made easier thanks to its increased resistance to high temperatures, as well as its ability to reduce dust.

Glass Bit

Glass Bit

Features

  • Material: Metal
  • Item Dimensions LxWxH: 2 x 2 x 2 inches
  • Color: Silver white
  • Style: Industrial
  • Item Weight: 0.37 Kilograms
  • Compatible Material: Porcelain, Wood, Glass, Ceramic, Marble, Stone
  • These diamond drill bits are made of industrial grade carbon steel with nickel-plated coated body to resist corrosion. Fine workmanship and super wear-resistant, sharp
  • Each hole is treated with smooth and accurate surface treatment, and the top oh the hole is thickened to achieve excellent cutting strength
  • Tile Hole Saw 15 Size: 6/ 8/ 10/ 12/ 14/ 16/ 18/ 20/ 22/ 25/ 26/ 28/ 30/ 40/ 50 mm to meet various demands
  • Wide Usage: Used on Drill Glass, Wood, Tile Bottles, Blocks Jars, Ceramic, Slate Mable, Granite Light Stone, and other hard surfaces
  • Attention: Please keep adding water when the diamond drill bits are working on the glass or ceramics. low drill pressure and increased use of water lubrication will extend drill bit life.

19- Forstner Bit

This style of drill bit is ideal for creating perfectly round holes in wood. Precision cutting holes is possible with this bit. To keep the bit where you need it, it has a sharp tip.

Forstner Bit

Forstner Bit

Features

  • Razor sharp serrated edge for fast and flawless cutting
  • Quality Forged Construction for extended life
  • Ultra Sharp Spur to ensure an accurate starting hole
  • Steep Angled Cutting Edges – produce holes that are smooth and flat, and create “chisel-like” curls for fast, clean chip removal.
  • Ideal For: Drilling flat bottom holes, pocket holes, or overlapping holes.

In order to keep it clean, you will need to remove it from the case on a regular basis to remove chips and dust. A drill press using this sort of drill bit is required in a number of applications.

20- Hole Saw

If you need to install door hardware or a wiring pass-through, you can use this type of drill bit. It’s pushed out of the saw cylinder by a side cut-out created by the hole saw.

Hole Saw

Hole Saw

Features

  • Item Dimensions LxWxH: 5.7 x 3.3 x 2.7 inches
  • Item Weight: 6.4 Ounces
  • Compatible Material: Wood, Metal
  • 2X more durable with 50% longer life than previous LENOX hole saws
  • Increased wall thickness improves durability and minimizes tooth loss
  • Optimized tooth design penetrates metal with ease
  • Larger, sharper teeth for faster cutting
  • SPEED SLOT staircase design for easy plug ejection

An attachment can be used to centre the hole and a pilot bit can steady the blade. Instead of a pilot bit, small hole saws have a built-in shank. You can drill holes in wood and metal with a bi-metal hole saw.

Conclusion

Various sizes and styles of drill bits are available. There’s no such thing as an optimum drill bit. There are several sorts of drill bits in a drill bit kit that will guarantee that you always have what you need on hand.

Leave a Comment