12 Best Drill Bit for Hardened Steel Bolt in 2020 – Top Picks & Reviews

One of the proudest moments for any handyman is when they’ve invested a drill that they believe will solve all of their problems. However, here lies a major issue. Most of the bits that come with the machine are too soft for dealing with hardened surfaces such as steel.

This makes your work more difficult plus puts the material at risk of damage. Keep in mind that different drills are designed for different materials.

We understand that getting the best drill bit for hardened steel bolt may not be as straightforward as it should be. So, we are going to help you make the right choice.

In this article, you will find a sample of the ideal drill bits that we have analyzed, and we believe that these are the best in the market. On top of that, we shall provide you with a buying guide that points out the factors to focus on during your search for the best accessory.

Let’s go!

Best Drill Bits for Hardened Steel Bolt 2020 - Comparison Table

Take your time and read the following products that we have reviewed. Your preferred item may lie somewhere on the list.

Picture
Top Pick
DEWALT Titanium Drill Bit Set, Pilot Point, 21-Piece...
Editor's Choice
Drill America - DWD29J-CO-PC 29 Piece M35 Cobalt Drill...
Budget Friendly
IRWIN Screw Extractor/ Drill Bit Set, 35-Piece...
Also Great
Hymnorq Metric M35 Cobalt Steel Extremely Heat...
Also Good
IRWIN Drill Bit Set, M35 Cobalt Steel, 29-Piece...
COMOWARE Step Drill Bit Set & Automatic Center Punch-...
Product Name
DEWALT Titanium Drill Bit Set, Pilot Point, 21-Piece...
Drill America - DWD29J-CO-PC 29 Piece M35 Cobalt Drill...
IRWIN Screw Extractor/ Drill Bit Set, 35-Piece...
Hymnorq Metric M35 Cobalt Steel Extremely Heat...
IRWIN Drill Bit Set, M35 Cobalt Steel, 29-Piece...
COMOWARE Step Drill Bit Set & Automatic Center Punch-...
Weight
1.05 pounds
3 pounds Shipping
1 pounds
4.4 ounces
4.5 pounds
1.3 pounds
Prime Status
-
Top Pick
Picture
DEWALT Titanium Drill Bit Set, Pilot Point, 21-Piece...
Product Name
DEWALT Titanium Drill Bit Set, Pilot Point, 21-Piece...
Weight
1.05 pounds
Prime Status
Editor's Choice
Picture
Drill America - DWD29J-CO-PC 29 Piece M35 Cobalt Drill...
Product Name
Drill America - DWD29J-CO-PC 29 Piece M35 Cobalt Drill...
Weight
3 pounds Shipping
Prime Status
Budget Friendly
Picture
IRWIN Screw Extractor/ Drill Bit Set, 35-Piece...
Product Name
IRWIN Screw Extractor/ Drill Bit Set, 35-Piece...
Weight
1 pounds
Prime Status
-
Also Great
Picture
Hymnorq Metric M35 Cobalt Steel Extremely Heat...
Product Name
Hymnorq Metric M35 Cobalt Steel Extremely Heat...
Weight
4.4 ounces
Prime Status
Also Good
Picture
IRWIN Drill Bit Set, M35 Cobalt Steel, 29-Piece...
Product Name
IRWIN Drill Bit Set, M35 Cobalt Steel, 29-Piece...
Weight
4.5 pounds
Prime Status
Picture
COMOWARE Step Drill Bit Set & Automatic Center Punch-...
Product Name
COMOWARE Step Drill Bit Set & Automatic Center Punch-...
Weight
1.3 pounds
Prime Status

12 Best Drill Bit for Hardened Steel Bolt – Reviews

1. Dewalt DW1361 Titanium Drill Bit Set

Are you looking for a drill bit that is guaranteed to serve you for a lifetime? If you are, Dewalt DW1361 would be a reasonable pick. The bits are constructed out of titanium that makes them strong enough to drill through the toughest surfaces.

Our review below will tell you more about the drill bit set.

Product Description

Let's add to the durability aspect of these drill bits. Each tool has an extra titanium coating on it to boost the strength and durability of the bits. This is in addition to the web-like design for extra support, and this makes the bits suited for use on any type of material.

This set features twenty-one different types of drill bits, all of which are gold-colored, and they allow you to use them for different functions.

Another thing we are going to mention is that the bits have no spin shanks. So, changing drill bits during operation is going to be a straightforward affair.

Other Features and Benefits

We liked the bits start drilling as immediately they come into contact with the surface. In the end, you are likely to have used less time and energy on the project.

In general, these drill bits are going to give you some nice-looking holes after a mess-free operation.

Pros

  • Damage-resistant
  • Easy bit changes
  • Versatile

Cons

  • Poor case quality

2. Drill America M35 DWDCO Series Drill Bit Set

Drill America gives us 29 cobalt drill bits that are rust-resistant due to the gold oxide finish they have. This ensures that the bits remain in good condition for an impressively long duration.

Product Description

To add to the gold oxide finish, it acts as a lubricant and protects the bits when you subject them to extreme uses. Then, each bit has a self-centering 135-degree split point for easy penetration into tough materials.

The other thing to discuss is cobalt, which is known to have tolerance towards high temperatures and pressure. This adds to the bit's suitability for drilling through tough materials.

With this set, you have a wide range of precision to choose from due to the inch sizes that range from 1/16" to ½."

Other Features and Benefits

The set comes in a plastic case with a belt hook, which gives you options as you operate in tight spaces. The case is divided into clearly-labeled portions for easy identification of the tools when needed.

Lastly, the product meets ANSI specifications to assure you of uncompromised quality.

Pros

  • Plastic case for organization
  • Rust-resistant bits
  • 29 pieces in the set

Cons

  • A bit fragile

3. Irwin Hanson 11135ZR Screw Extractor/Drill Bit Set

If your drilling operation is not as smooth as it should be due to the drill bits getting stuck in the material, you should consider acquiring this set by Irwin Hanson. These tools are designed to help you get rid of the hindrances that made life difficult for you.

Product Description

First, the bits have an aggressive left-hand design to give it the gripping power need for the job. On top of that, the spiral flutes and multi-spine extractors help in drilling through the surface for a smoother operation.

The sizes of the extractors and drill bits are etched on each tool to eliminate guesswork when it comes to selecting the right tool for a particular task.

We liked the multi-spline extractors, which are specially designed for high-torque applications.

Other Features and Benefits

We cannot leave out the M-42 high-speed steel construction to give the bits abrasive resistance when dealing with tough metals.

Lastly, the package includes a plastic case for storage and transportation.

Pros

  • Left-hand design for good grip
  • Built to last
  • Sizes are labeled on the tools

Cons

  • No user manual

4. Hymnorq M35 Cobalt Steel Twist Drill Bits

What could more frustrating than having drill bits which fall apart on little application of pressure? If you are tired of finding yourself in this situation, the Hymnorq drill bits are here for you. We will tell you why this product would be a viable long-term investment, among other notable features.

Product Description

First, these bits have a sturdy M35 steel alloy construction to give them impressive durability. On top of that, they are heat-treated to ensure they deliver outstanding performance under intense heat and pressure.

The next notable feature is the 135-degree split point that allows you to use less force as you drill through the metal. The split point is self-centering to allow you to drill accurate sizes of the holes as required.

You are sure to appreciate the twisted design that allows the bits to drill deeper into the surface you are working on without getting stuck.

Other Features and Benefits

The other feature lies with the straight shanks, which ensure that the bits do not slip during the drilling process for faster operation.

This set of 13 drill bits comes with a plastic case indexed for organized storage and transportation.

Pros

  • Has a user manual
  • Heat-treated bits
  • Twisted design for flexibility

Cons

  • Not for extremely tough surfaces

5. Irwin 3018002 Drill Bit Set

For over a century, Irwin has developed a reputation for producing high-quality power tools that never disappoint. All their products are characterized by excellent craftsmanship such that they always deliver as expected.

In this review, we are going to see whether Irwin 3018002 reaches the high standards associated with the brand.

Product Description

First, this set contains drill bits with cobalt construction that gives them extensive heat and abrasion resistance. So, the bits are well-suited for heavy-duty drilling through the toughest materials such as hardened steel.

With about twenty-nine pieces in the set, it will be easy for you to find the right tool for any heavy-duty drilling task that you may have.

You may also notice that these bits have reduced shanks. This allows you to use larger drill bits in a 3/8” chuck.

Other Features and Benefits

Getting the right bit for the job shouldn’t be a problem as you have a tap and drill selection chart to help in the choosing.

There is also the removable bit cartridge to help you move the bits from the case to your worksite. Now that we have mentioned the case, it is a rubber over-molded one for the accessories' secure storage.

Pros

  • Comes with different bit sizes
  • Built to last
  • Has a storage case

Cons

  • Poor packaging

6. Comoware Step Drill Bit Set

Are you looking for an item that would deliver whether you use it indoors or outdoors? Your search should stop at the Comoware drill set, which features high-quality accessories built to meet your demands.

Product Description

First, the bits are designed to serve you for the longest time possible. It is made out of high-speed steel and is coated with titanium. This is a combination that gives the accessory impressive durability.

Then, the bits are built to be sharp to reduce friction. Therefore, you can operate the machine for a longer duration without overheating the motor.

We liked the flexibility that these bits offer, and you can use them to drill holes of different diameters. This makes them ideal for all sorts of drilling projects.

Other Features and Benefits

With the 118-degree split point and dual-flute, you can take 'walking' and 'slipping' out of the equation for a smooth operation. This design also provides you with more penetrative power while the split point boosts their abrasion-resistance.

Lastly, the carry case and drill holder are both useful in securing the bits after use.

Pros

  • Sizes are etched on the bits
  • Flexible for diverse operations
  • Durable

Cons

  • Not for high-speed applications

7. Dewalt DW1263 Pilot Point Drill Bit Set

Dewalt is a top brand that has been producing power tools for a long time. This implies that they know what they are doing, and you can tell this by looking at the positive reviews showering their products.

In this review, we are going to explain to you why we believe this drill bit set is one of the best high-performance set that you may ever come across.

Product Description

We shall start with the cobalt construction that gives the bits the sturdiness and sharpness to drill through the toughest metals and steel sharply and fast.

The next aspect to discuss is the case. It is well-built from industrial-grade ABS material for secure storage of the 14 different bits of different sizes. The package is divided into labeled slots for proper organization and easy identification of the accessories.

As for the pilot point end, it aims to prevent walking to get the preciseness you have been looking for.

Other Features and Benefits

Besides the case, the package also features a bit holder for storage of the bits after use. 

Have we mentioned the interlocking hinge and the rubber lock that ensures the case remains tightly locked?

Pros

  • 14 different bits for different tasks
  • Durable bits
  • Well-built case

Cons

  • The small bits cannot handle high pressure

8. Irwin 11119 Screw Extractor and Drill Bit Set

The Irwin Hanson brand makes it to our list once again, and this should be an indicator that you are dealing with a high-quality product.

Does the Irwin 11119 set meet the standards set by previous models from the brand? Let’s see.

Product Description

This set contains five drill bits and five extractors with winding flutes to enable them to embed themselves deeper into the metal during the drilling operation. The only thing is that the drill must be in reverse mode before you embark on the process.

The bits have a left-hand spiral design to make them easy to use as they offer you a soft and comfortable drilling power.

You are sure to like the ergonomic design that enables you to remove the broken bolts, studs, and socket screws with maximum ease.

Other Features and Benefits

The size of each extractor and drill bit is etched on the surface so that you can easily choose the appropriate item for each task.

Last but not least is the storage case for putting away the accessories after use.

Pros

  • Aggressive left-hand design
  • Ergonomic design
  • Sizes etched on the surface

Cons

  • Questionable build quality

9. Dewalt DWA1240 Cobalt Drill Bit Set

An efficient drill bit is one that is built with sharpness and durability as the top priority. An excellent example of such an item is the Dewalt DWA1240, with the outstanding features being the split point and pilot point design.

In our review, we will reveal the significance of the two features above and other useful aspects of the product.

Product Description

Let's start with the split point design that makes the bit fast plus gives it the capability to drill through the toughest materials, including stainless steel.

Next is the pilot point, which provides you with more control to eliminate any shakiness during operation. Therefore, you are likely to have a smooth drilling experience.

With the 14 drill bits pieces, you will be spoilt for choice on the appropriate item to use for various tasks.

Other Features and Benefits

The bits are made out of cobalt to give it the sturdiness that makes them damage-resistant. On top of that, the material is rust-proof to boost the bits' durability further.

Lastly, the pricing is also right so that you do not have to dig too deep into your pockets to acquire this tool.

Pros

  • Well-made
  • Affordable
  • Pilot point for stability

Cons

  • Not that durable

10. Amoolo 13-Piece Cobalt Drill Bit Set

This is a relatively unfamiliar brand, but that does not make it inferior to the rest. It has numerous features that would make the set to be a viable investment.

Let’s see what it has for us.

Product Description

This is a set with 13-pieces of bits, all of different sizes to find the one to suit your needs easily. Even better is that the bits are compatible with most of the power drills that you find in the market.

We also liked the high-speed steel and M35 cobalt construction that boosts the bits’ wear-resistance and durability.

These bits feature a 135-degree split point and a straight shank, a combination that prevents walking for a faster and precise drilling process.

Other Features and Benefits

We shall mention the fully ground spiral groove design that clears the particles quickly to minimize friction. As a result, you are likely to have a cooler drilling experience.

Within 90 days, if you are not satisfied with the product, you can ask for a full refund or replacement due to the 90-day warranty.

Pros

  • Ideal for multiple application
  • Comes with a 90-day warranty
  • High-quality construction

Cons

  • Somewhat weak bits

11. Efficere 8-Piece Silver and Deming Drill Bit Set

If you have to drill holes with larger diameters exceeding half inches, the Efficere drill bit set would be a reasonable pick. The set features 8-pieces of drill bits of different sizes ranging between 9/16” and 1”.

Product Description

First, these bits are quite durable, and we attribute this longevity to the premium cobalt high-speed steel construction. This gives them the sturdiness to drill through different materials such as wood, copper, and aluminum.

The dual-coating comprises gold titanium and black nitride to act as a lubricant for a smooth drilling experience. This finish also gives the bits corrosion-resistance property.

As for the 135-degree split point design, it improves the cutting speed plus also minimizes walking and wobbling during operation.

Other Features and Benefits

The ½” shank with the tri-flatted end locks securely onto the chuck. This is crucial in ensuring there are no slips during operation.

Lastly, the bits come with a heavy-duty aluminum case for transportation and storage of the equipment.

Pros

  • Designed for drilling bigger holes
  • The finish keeps them lubricated
  • Durable

Cons

  • Not for extremely hard surfaces

12. Irwin 63221 Drill Bit Set

The last item on our list is from the Irwin brand, and just because it closes down our list does not mean it is inferior. The model has an advanced design that makes it an ideal choice if you are into professional drilling.

Product Description

The creative design we were talking about earlier is the shorter cutting lips for reduced torque, making drilling on the harder surfaces easier. On top of that is the 135-degree split point tip to reduce resistance during drilling.

You should also know the M-42 metal with 5% cobalt construction, which gives the bits sturdiness and makes them damage-resistant.

Besides that, cobalt makes the bits rust-resistant for durability and remains useful for longer than other bits.

Other Features and Benefits

We liked the spiral flute design that allows for faster bit changes as you go about your operation. Then, the package includes a metal safety box for safe storage of the bits when not in use and for ease of transportation.

This set is quite pricey, but we believe it offers you value for your money.

Pros

  • High-quality construction
  • Allows for easy bit changes
  • Metal box for storage

Cons

  • Expensive

The Buying Guide for Hardened Steel Bolt Drill Bits

As you look for the best drill bit for hardened steel bolt, there are several features that you should consider. This would help you narrow down your search and boost your chances of landing the perfect item.

I) Material

The material used to construct the bits determines their level of efficiency and performance. Hardened steel is extremely sturdy, and to penetrate it, you need something tougher. The top materials that we recommend include cobalt, carbide, and hardened steel.

II) Flute Design

It would be best to get a 30-degree flute design as this is better suited for dealing with tougher materials such as hardened steel.

III) The Coating

The coating helps in boosting the metal's durability by enhancing its rust and corrosion resistance. So, it is important if you can find the strongest coating for the job.

The coating that we recommend you look out for include black oxide and titanium carbo-nitride coating. These are likely to do an excellent job of protecting the steel from rust and corrosion.

IV) Ease of Removing Broken Bolts

At times, parts of the drill bits or bolts get stuck inside the surface you are working on. This interferes with the smoothness of going about the operation.

So, the drill bit ought to have a swift reverse action for removing the stuck bits without destroying the material.

V) Extra Features

There are features such as the 135-degree split point with a self-centering mechanism that gives you more power as you operate the tool. This adds to its reliability to the user.

Another useful bonus would be x-type opening blades, as these would remove wastes during drilling for mess-free operation.

FAQs On Top Drill Bits for Hardened Steel Bolt

Here are some of the queries that we faced in our research on the top-selling drill bits meant for hardened steel bolt. Their responses should boost your knowledge of the topic.

Q: Why am I having a hard time drilling through steel?

A: It may be due to your drill bits having some corrosion. To get yourself out of this situation, you should apply some oil on the bits.

Q: Is it possible to enlarge a hole on the hardened steel material?

A: Yes, it is. The best way to do so is by using a drill whose end is thicker.

Q: How can I clean my drill bits to remove the leftovers?

A: Start by mixing some water and a cleaning detergent in a basin full of water. Soak the bits in this mixture for a short while before using a brush to clean the bits. After that, allow the bits to dry.

Our Top Pick

In the end, we have selected the Dewalt DW1361 Titanium Drill Bit Set as the best overall. Everything about the set is just about right, from the construction quality to its versatility.

The only thing is that you have to contend with a low-quality storage case.

Final Word

Getting the perfect drill bit for drilling through tough materials such as hardened steel is a confusing task. We hope that our article has made things easier for you.

In the buying guide, we have spelled out the specifications of a perfect drill bit for hardened steel to have an easier time finding your ideal choice.

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