How To Choose The Right Carbide Drills?

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It’s not as simple to select the greatest carbide drill as it formerly was. How do you pick the best drill bit? You should select a drill bit that has adequate chip clearance, superior surface quality, and exact hole placements to obtain the best results. To make the best decision, be aware of the fundamentals of drill bit selection, including material, coating, geometries, kinds, sizes, and requirements.

The options might be daunting as you advance from the basic HSS carbide twist drill to the wide variety of solid carbide drills, carbide drills with coolant holes, and multi-function carbide drills. Carbide drills come in a variety of shapes and sizes, and they are widely used in the mining, aerospace, tool and die, and other industries. If carbide twist drills were the only drills available, modern industry would come to a grinding halt.

It has long been accepted that drilling should only be done at slow feed rates and cutting speeds, which was originally true when using typical drills. However, the idea of drilling has evolved with the introduction of carbide drills. In reality, drilling productivity may be significantly increased and the hole-processing cost can be decreased by choosing the most appropriate carbide drill. So how can you rationally pick a carbide drill? To learn more about the specifics, continue reading the manufacturers of carbide drills.

  1. Drill Types

First, let’s examine drills before deciding which kind of drill to employ. The solution is based on both commercial and technological factors. The two primary categories of carbide drills that consumers can select from are discussed here:

  • Carbide Twist Drills

The carbide twist drill is easily identified by the unique helical flutes, or grooves, that span the majority of its length. Cutting fluids can enter the work area through helical flutes, which also remove chips from the hole. The term derives from the production method invented by Morse, which involved twisting the spherical drill blanks after milling the flutes.

Although cobalt alloy, solid carbide, and carbide-tipped twist drills are frequently used, modern carbide twist drills are typically built of HSS. Depending on whether the workpiece material produces long or short chips, a variety of diameters, lengths, shank types, and tip angles are available for carbide twist drills. The twist drill is the preferred drill in most situations because of its versatility.

  • Carbide Drills With Coolant Holes

All aspects of customer feedback and special requirements are taken into account while designing carbide drills. This motivated us to design the best drill we could, one that could tackle almost every drilling task. Performance and low prices per generated unit are important to customers. The product is this carbide drill with an integrated cooling system. Installing an internal cooling system that clears chips from the work face will lengthen the duration between maintenance sessions. As a result, tungsten carbide drills are significantly more affordable than HSS drills. This product is a collet chuck that has been engineered to work with standard drill heads and that enables coolant to be pumped through the drill bit. The coolant can reach the hotter, more heated portion of the drill, where it is most needed, and it effectively eliminates chips from the working area.

  1. Drills Size

To choose the right drill for the precise size of the hole, a drill size chart and a tap size chart are frequently needed. In addition to fractional, metric, wire gauge number, and letter measurements, the drill size table also includes the standard size in other measuring systems. The size of the hole you wish to drill will determine the diameter of the drill you select. Nowadays, the majority of drills have diameters ranging from 1 mm to 20 mm.

The size of the drill can also be chosen based on the screws you want to use. Drill a hole that is somewhat smaller in diameter than the screw’s diameter. Use a drill with a 3 mm diameter, for instance, if the screw you are using has a diameter of 3.5 mm. The drill and anchors should have the same size if you’re using wall anchors in addition to screws. The drill speed will also depend on the drill bit’s diameter and the material you plan to use it on. Please visit Huana Tools if you want to learn more about drills of various sizes.

  1. Drill Materials

Typically, high-speed steel, high-speed steel with cobalt, or carbide are used to create drill bits.

  • High-speed steel: 

The cheapest and most basic drill component, it may be used both manually and in drill presses. By periodically resharpening the drill, you can increase its longevity.

  • Carbide:

The most costly material is also the one that can last the longest. It offers the highest heat and chip resistance and has pores for coolant flow. Although carbide is more expensive than other materials, using a carbide drill often results in the lowest cost per hole since it can make more holes than cobalt and can operate 3 to 5 times quicker. The drill bit is mostly used to drill deeper holes or to work with materials that are difficult to drill.

  1. Carbide Drill Coatings

Drilling friction is decreased by coatings. This decrease in heat enhances the flow of material out of the hole and protects the drill bit. For a quick description of the different drill point coatings, see below.

  • Bright finish:

The least expensive coating, frequently used to drill work pieces made of low-carbon steel and aluminum.

  • Black oxide:

Black oxide has more lubricity than brilliant finishes, is oxidation-resistant, and can have its service life extended by adding heat treatment.

  • Titanium nitride (TiN):

The most popular alternative is titanium nitride (TiN), a very strong ceramic substance with a brilliant gold coating applied to metallic surfaces. TiN is perfect for novices and situations where cutting rougher or harder materials won’t generate a lot of heat that will pass to the tool.

  • Titanium carbonitride (TiCN): 

The most lubricious of all the TiN coatings, titanium carbonitride (TiCN) has enhanced hardness and wear resistance as well as greater performance. It usually has a purple or blueish hue.

  • Titanium aluminum nitride (TiAIN): 

The term titanium aluminum nitride (TiAIN) refers to a class of hard coatings that are metastable and excellent for steel and stainless steel but not for drilling aluminum. It performs better than TiN and TiCN and is great for materials used in high-temperature applications.

Overall, drills with a TiN coating are a popular choice for mild steel, drills with a TiCN coating are the best choice for cast iron, and drills with a TiAIN coating are advised for high-heat applications. If you’re not cutting challenging materials, a high-quality cobalt drill with a TiN or TiCN coating is a reasonably cheap approach to increase productivity.

  1. The Drill Point

Among the lengths available for drill points are jobber, taper length, screw machine, mechanics, and taper shank. Shorter drills are typically better suited for tasks requiring a high degree of accuracy and precision. Additionally, they are stronger and more stiff. However, depending on the application, there are times when you’ll need to use lengthy drill bits.

The cutting head on the drill tip is angled at a drill point. The point angle or angle created at the drill tip depends on the substance it will be working with. Sharper angles are needed for softer materials and greater angles for harder ones. Wandering, chatter, hole form, and wear rate are all influenced by the proper point angle for the material’s hardness.

Carbide drills typically come in three different angles: 90 degrees, 118 degrees, and 135 degrees. Only use 90-degree drills on soft materials, like plastic and aluminum, as they quickly get dull. You may always use a protractor to record the angles on paper, as we have done here, if you are unsure of what you have. The most typical angle for consumer bits is 118 degrees. Almost every material you work with, including steel, aluminum, wood, stainless steel, brass, cast iron, and plastic, is acceptable for them. These carbide drills could wander on tougher substances like steel and stainless steel, necessitating the use of a center punch to hold them in place during the initial cut.

135-degree drills work well for hard materials like steel and stainless steel. The shallow angle makes it possible for the drill to cut into the material without fast becoming dull, but it also causes the bit to desire to wander, necessitating the use of a center punch.

  1. Cutting Length

The length of the drill hole is determined by the drill diameter, which is the diameter of the cut. Special cutting lengths can improve cutting performance. Tools and machinery will have a longer lifespan. As a result, the drills may get consistent dimensional precision and superior surface quality, making them appropriate for processing systems with exceptional stiffness. We provide 3D and 5D drills, which stand for 3 times and 5 times the cutting diameter, respectively. Carbide 3D and 5D type drills with strong cutting resistance and a stiff blade tip. Use on a variety of materials is advised. uses a coating that has great toughness and wear resistance to assist extend the life of the tool.

  1. Flute Design Features

Flutes have a variety of uses, from inexpensive removal to a path for cutting fluid to contact the cutting surfaces. The drill’s body has grooves called flutes that allow the drill to pierce the surface you are working on. There are many varieties of the flute, but these are the ones that are most popular right now:

  • Standard flute design:The most often used flute design is round in cross-section.
  • Straight flute:It is appropriate for usage when the drill’s stiffness is more important than chip evacuation. Additionally, it works best for short-chip materials, when spinning work pieces are used rather of drilling.
  • The parabolic flute design:It has numerous advantageous characteristics, including a low peck cycle, a high feed rate, a smooth, inexpensive evacuation, and quick cycle times. It functions via a quick spiral and open geometry.

You don’t need to be concerned about where to find the design you want. You simply need to say what you want using Huana tools modification for designs, and you’ll have it!


Can carbide drill bits be sharpened?

Even the highest-quality drill bits will eventually become worn out, at which time you must choose between sharpening or replacing them. Carbide drill bits are expensive, therefore it’s probably worthwhile to sharpen them. Any sharpening won’t work on your carbide drill bits, though. You must use the proper equipment for the task, in this case a diamond-surface grinding wheel.

It could be more economical to pay a professional to perform it for you if you don’t have access to a grinding wheel. Therefore, even while you can sharpen carbide drill bits yourself, doing so takes specialized equipment, and doing it well may require considerable expertise.


It is essential to the success of any project or application to select the appropriate drill bit for the work at hand. However, in order to save yourself time, money, and effort when choosing a drill bit, it is important to have a full understanding of the elements that should be considered. If you make the proper pick, you may extend the life of your drill bits in a number of different ways, including matching the suitable bit to the substrate material, finding the perfect fit for the depth and diameter of the hole, or even the amount of work that has to be done. This, in turn, serves to boost productivity since it enables you to do more with each drill bit that you use. As a supplier or distributor, are you interested in placing an order for carbide drill bits? Carbide Drill Bits and other cutting tools of the highest quality can be found at Huana Tools, the finest location to get them. Contact us right away to ask for a no-obligation estimate of the costs associated with your project.

Carbide Drill

Thin the flute surface, and the flute adopts a reverse-blunting process:

1. Uniform size and shape improve cutting safety;

2. It makes tool life predictable for better control over usage duration.

Coolant holes are positioned close to the cutting flute to minimize heat at the cutting edge.

The drill tip angle is designed to complement guide drills and pre-drilling, with a tip angle of 133°.

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