Best Drill Bit For Cast Iron

Drill bits are tips that are attached to the end of drills and are used to make holes in various materials. A circular hole is almost typically created, while certain specialised bits may be used to create holes of other shapes for specific applications.

On the end of the drill, there is a rotating component that is connected to a motor that is often driven by electricity. The drill bit is attached to this spinning piece. The power is provided by means of a cable or a rechargeable battery.

The drill is equipped with a device known as a chuck, which may be tightened onto the top end of the bit, known as the shank, in order to keep it securely in place throughout the drilling operation.

If you work in a workshop, or in a commercial building or you want to drill into cast iron then this blog is a must read one for you. We have liste few tested best drill bits for cast iron. Read to know more, it’s gonna be interesting!

COMOWARE Cobalt Drill Bit Set- 13Pcs M35 High Speed Steel

In the course of a project, drill bits are subjected to significant strain. We must ensure that the drill bits in our arsenal are capable of withstanding this kind of punishment. In the event that you are having difficulty locating the proper one, Comoware has introduced a drill bit that provides exceptional endurance and lifespan.

The 5 percent cobalt utilised in the production of the drill bits ensures that M35 grade goods are produced and provides the advantage you need when dealing with very hard surfaces such as aluminium, stainless steel, high-temperature alloy, and so on.. The use of cobalt also increases the endurance of the bits and contributes to their long-lasting characteristics.

In addition, by including a gold oxide layer in the mixture, which is impenetrable to oxidation, corrosion, and wear, it increases the overall lifespan of the product. So it’s a fantastic one-time investment!

In addition, the pilot tip has a 135-degree angle, which allows you to have a smooth and effective drilling experience on a variety of materials with ease.

It should also be noted that the 135-degree split tips automatically centre themselves. This means that the wandering and wobbling effects are decreased by orders of magnitude throughout the cutting process, resulting in a clean and uniform cut. It is also intended that trash and waste particles may easily exit via the ends of the blades, resulting in a more precise cut.

Finally, the package includes 15 parts that vary in size from 3/32 to 3/8-inch and allow you to create a variety of shapes. Furthermore, all of the parts are packaged in a small, lightweight plastic case that can be easily transported and stored anyplace in your garage or workshop.


  • Material: HSS M35 Cobalt 5%
  • Angle Point: 135 Degree
  • Flute Type: Spiral
  • Shank Type: Straight Shank





 In the following imperial sizes 1/4″, 15/64″, 7/32″, 13/64″, 3/16″, 11/64″, 5/32″, 9/64″, 1/8″, 7/64″, 3/32″, 5/64″, 1/16″

M35, Fully Ground, 135° Split Point

Each of these Drill Bits contains 5% Cobalt and is fully grounded to provide a precise drilling diameter measurement. 135° Split Point Design makes it easier to drill several holes in harder materials with a single tool.


Plastic Case that is very tough and durable. The ideal solution for keeping your Cobalt Drill Bits organised and safe.

Perfect for Hard Metal

COBALT DRILL BITS ARE THE MOST SUITABLE DRILL BITS FOR METAL WORKING. Other hard materials include stainless steel, heat-treated steel, hardened steel, ductile iron, bronze, titanium, and more.


M35 Cobalt HSS is better suited for toughened materials than M35 Stainless Steel. The tool is particularly effective in cutting through strong metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics, and wood, but it may also be used on softer materials such as paper and cardboard.



  • It includes 15 pieces of bits, which expands the range of drilling possibilities.
  • Contains a rustproof oxide layer,
  • Wear-resistance abrasion Docking is simple and secure because to the straight shank.
  • Highly durable


  • Damage to the plastic case may be sustained with little effort.

Metric M42 8% Cobalt Twist Drill Bits Set

Let us begin by discussing the drill bit set’s robust structure. The metal is a high-quality M42 high-speed steel alloyed with 8% cobalt. This increases the drill bits’ resistance to heat, increases their hardness, and aids in quicker drilling or cutting. Additionally, the thoroughly ground body produces less burr, allowing for excellent, accurate cuts.

Moving on, this drill bit set has a Rockwell Hardness Scale rating of 68-70, which is rather high and quite excellent. The drill bits’ unique three-step twist design allows them to easily cut through strong metals such as hardened steel with ease, even when the metal is extremely hard.

In addition, the tools are produced with superior cobalt, which makes them slightly more expensive than competing brands, but it also increases their toughness and endurance at the same time.


  • Cobalt: M42 8%
  • Design: Three steps
  • Shank Type: Straight
  • Measurement System: Metric
  • RPM: 200 to 1,000
  • Dimensions: ‎7.48 x 5.55 x 1.77 inches
  • Flute Type: ‎‎Spiral Cutting
  • Angle String: ‎‎‎135 degrees
  • Package: 19 pcs
  • Ideal Use: ‎‎‎Stainless steel and hard metal




Premium M42 8% Cobalt Steel

Premium M42 8 percent Cobalt Steel, 68-70 HRC (Rockwell Hardness Scale), is known for providing the best heat, wear and chip resistance while also providing a long tool life.


This Cobalt Drill Bit is capable of running three to five times faster than the average drill bit. Despite the higher cost, the cost per hole will be the lowest when using a cobalt drill bit due to the fact that it can produce significantly more holes.

Sharp Bit Edge

It is possible to cut metal materials into long strips of iron chips rather than slowly grinding through the material with a blunt drill bit if the bit edge is sufficiently sharp.



  • 3-step twist design enhances drilling efficiency
  • Ideal for tough, hardened metals
  • Heat and wear-resistant


  • No storage holder provided

The Stroton Metric M42 8 percent Cobalt Twist Drill Bits Set is a good choice for working with stainless steel and hard metal because it places a strong emphasis on long-lasting durability. Cobalt bits can cut through a variety of other materials, including plastic and aluminium, thanks to the three-step construction of these tools. Furthermore, the sharp bit edge allows you to maintain your drilling speed even when drilling through dense materials.

Amoolo 1/4″ Cobalt Drill Bit(10 Pcs), M35 HSS Metal Drill Bit Set

For our next entry, we have the Amoolo M35 HSS Metal Drill Bits, which are suited for drilling through a variety of tough materials such as aluminium, cast iron, stainless steel, and other similar materials. There is a 5 percent cobalt concentration in this sample, and it is of M35 grade.

Any product constructed of M35 grade alloy will be extremely long-lasting, there is no doubt about that. The cobalt in the high-speed steel (HSS) serves to increase the strength of the drilling bits in comparison to their competitors, and they endure far longer than their competitors. It also increases the heat-resistant capacity of the material, which ensures that it is not harmed even in adverse weather conditions.

Furthermore, we like how it improves the precision and correctness of your initiatives. If you use it, you may be confident that the holes you drill in the surfaces will always be on point and will never deviate from the objective. This is beneficial while working on significant projects that necessitate the use of precise measurements. Walking is prevented by the split point of this item, and drilling is improved as a result.

Furthermore, the pocket-sized compactness of this drill bit set is something we appreciate. It is simple to keep in a toolbox and does not take up a lot of floor space. In order to transport it when travelling, you can put it in a tiny metal container.


  • Material: M35 cobalt high-speed steel
  • Cuts through: Metal, cast iron, and stainless steel
  • Type: Standard
  • Bit sizes: 1/16″ up to 1/4″
  • Number of bits: 13 bits





Industry quality 6542 high velocity metal drill bit set made of M35 cobalt and high speed steel, which is more durable than 4241 high speed steel used in other similar drill bit sets. Added to that, these drill bits include 5% cobalt, which increases their wear resistance and sturdiness over time.


Multiple applications that are ideal for slicing hard steel such as stainless steel, metal, and forged iron, as well as wood, aluminium alloys, and other softer metals are available to you. This is not the case for glass or ceramic supplies. Not for use with high-carbon steel or heat-treated steel. Throughout the drilling process, keep an eye on the velocity, strain, and temperature management.

Decreased Friction

Surface course and 135° cut up pointfully floor spiral groove design clean particles quickly, reduce friction and heat generation, resulting in faster and cooler drilling performance. Table course is completely flat. Drilling with a 135° cut up level and a straight shank prevents walking and allows for more precise and faster drilling. There is no need for a heart punch.


  • Delivers precise results
  • Compact in size
  • Durable
  • Easy to use


  • Case is not up to the mark

Most drills may be used with this cobalt drill bit set, which produces holes that are far deeper than average. While drilling, the bits are heat resistant and have a distinct grooved design that stops them from walking around while you are drilling holes. Cutting stainless steel, cast iron, ordinary steel, and wood with these pieces is a breeze.

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