For the uninitiated, hardened steel is produced through a four-step process and with carbon steel at high temperatures. As the name indicates, bolts that are made of hardened steel are extremely durable and are used in a bunch of industries. Also, hardened steel bolts are extremely resistant to wear and tear, making these an ideal choice for diverse applications. When you want to find the best drill bit for hardened steel bolt, you have to find a product that’s designed to work for material as durable as this kind of steel. In this guide, we have listed the basics and a few products that you can consider.

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Migiwata Metric M35 Twist Drill Bits with Straight Shank Set.

Top pick

Migiwata Metric drill bits

 

Migiwata brings this set, which includes drill bits that are made of M35 cobalt steel with added molybdenum and cobalt. The product is designed to be heat resistant, and no… Read More on Amazon

 

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$14.99 from Amazon

 

 

 

 

*At the time of publishing, the price was $14.99.

    

Reviewing top five products

Here’s our list of five drill bits that work perfectly for hardened steel bolts.

  1. Migiwata Metric M35 Twist Drill Bits with Straight Shank Set. Migiwata brings this set, which includes drill bits that are made of M35 cobalt steel with added molybdenum and cobalt. The product is designed to be heat resistant, and no center punch is required, as the 135° Quick-Cut points are self-centering and work without a lot of pressure. The set contains 13 pieces of M35 cobalt steel twist drill bits, and you can check the product description for measurements. This product is specifically ideal for hard metals. In case you are not happy, the brand also offers a full refund or replacement.
  2. Irwin Tools 3018002 Cobalt M-35 Metal Index Drill Bit Set. This set comes from Irwin Tools and is among the best-rated ones in the market. There are 29 pieces included in the package with 135° Quick-Cut points for minimizing the use of pressure. The product is higher heat & abrasion resistant and is ideal for both commercial and residential use.
  3. DEWALT DW1354 14-Piece Titanium Drill Bit Set. DEWALT brings this drill bit set that’s great for extreme use and for hardened steel bolts. If you want more, DEWALT also has sets with 40, 45 and 80 pieces and at quite affordable prices. With titanium pilot point, these drill bits are meant to last, while the tapered web prevents breaking. The brand offers a 30-Day Money Back Guarantee on the product, which is a plus.
  4. Titanium Drill Bit Set from Mastercraft. If you are looking for a big kit that can work for all kinds of hardened steel bolts, this product from Mastercraft is a great steal. The drill bits measure from 1/16″ up to 1/2″ bits and are meant to be designed on other products or materials such as plastics and glass. Titanium coated HSS ensures that these drill bits are durable, as much as by 6 times, compared to conventional bits. The whole set comes in a heavy-duty storage case.
  5. Impact Drill Bit Set for Hardened Metal. As the name implies, this product, which is from Proffi, is designed for hardened metal and includes seven pieces of high-speed steel bits. Compared to HSS drill bits, these are 25 times stronger and are ideal for both industrial and professional use. The product is made in Europe and of M2 HSS, which has procured from three big vendors. The company ensures manual inspection of all sets before being sold.

Things to know

There are five different levels when it comes to selecting HSS drill bits. These are T1, M2, M7, M35 and M42. M42 contains 8% cobalt, while M35 contains 5% cobalt. M42 rating is usually desirable for hardened steel, and it is important to consider some of the other aspects, such as the brand and warranty on the product. No matter whether you are using drill bits for personal use or professional needs, it makes sense to go for a product that’s meant to last and is durable, because eventually, you would be working with hardened steel bolts. Some brands are obviously better than the others, and you can expect to get a warranty or a replacement option on the product.

To sum up things, make sure to choose drill bits that are made of cobalt or a better material, check the brand, and if possible, go for a set that contains more sizes of drill bits. Most of the available sets are available online with a box, which is a big advantage because storing your drill bits will be easier.

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