Ever tried drilling into tough steel only to have your bit snap or spin uselessly? That frustrating moment is something many DIYers and pros know all too well. Drilling steel isn’t like drilling wood; it demands the right tool for the job.
Choosing the perfect bit for steel can feel like a maze. You face confusing terms like HSS, Cobalt, and Carbide. Pick the wrong one, and you waste time, break expensive bits, or worse—damage your workpiece. Nobody wants dull edges or overheating metal slowing down their project.
This post cuts through the confusion. We will break down what makes a steel drill bit effective. You will learn exactly which type of bit handles your specific steel project best, saving you frustration and money in the long run.
Ready to master steel drilling? Let’s dive into the essential guide on Bits For Drilling Steel.
Top Bits For Drilling Steel Recommendations
- Various Sizes: 13 sets of drill bits include 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", can meet more needs
- M35 Cobalt Drill Bit: The M35 cobalt drill bit is a durable, sharp and robust drill bit suitable for cutting stainless steel, iron castings, copper, aluminum and other soft metals as well as plastics, wood etc
- Quick and Efficient: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip and twist design for faster cutting, self-centering to prevent walk-off and faster chip and particle removal
- HSS Drill Bit Set: HSS cobalt drill bit set for hardened steel with excellent cutting performance. 13 sets of drill bits for long term use. The inserts are hardened and polished for improved sharpness and precise cutting without wobbling
- Easy Storage: The drill set includes a drill case with size indexes and is packaged in a small package for easy storage and sorting. If you have any questions, please refer to us and we will be happy to help you
- 135 Degree Split point tip design to help reduce walking
- High Speed Steel to be used in plastic, wood, and metal
- Tapered web design for extreme durability and resisting breakage
- Black and gold coating to help prevent rust and wear
- 3-Flats shank to reduce spin-out in the chuck on sizes larger than 3/16-in
- toolant Cobalt Drill Bit Set Pro - A metal drill bit set for steel and metal. Consisting of 21 titanium aluminum nitride coated cobalt drill bits with bullet point tips, offers exceptional performance specifically for drilling through metal.
- 21-piece Cobalt Drill Bits Set - Includes metal drill bits: 1/16"(*2), 5/64"(*2), 3/32"(*2), 7/64"(*2), 1/8"(*2), 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 5/16", 3/8", 1/2".
- Titanium Aluminum Nitride Coating - Increases surface hardness to 89HRC with outstanding heat-resistance, so your drill bit cuts fast and stay sharp.
- Specifically Crafted Bullet Point - Sharp and self-centering tip minimize wandering and provides precise and accurate drilling. TOOLANT Pro 21-pack is meticulously engineered to excel in demanding heavy-duty scenarios.
- 90 Days Warranty - In the event that you are not completely satisfied with your purchase for any reason, please reach out to us, and we will gladly provide a 100% refund or replacement.
- 【High Quality】M35 Cobalt steel precision ground drill bits for extra durability and long lifetime
- 【Efficient Design】Stubby drill bits measure from 1.83 to 2.32-inch only, allowing access to hard-to-reach and tight spaces. 135° split point two-blades drill tip (1/8-inch and larger) for perfect self-centering and fast drilling
- 【Multi-Purpose Use】Suitable for drilling stainless steel and various hardened metals such as cast iron, titanium, bronze, aluminium, etc. All drill bits come with one piece 1/4-inch hex shank compatible with standard and quick change chucks and drivers
- 【Popular Sizes】Includes imperial sizes: 3/32", 1/8", 3/16", 1/4", 5/16"
- 【Unique Packaging】Packed in special plastic box for easy storage, imprinted with drill bit sizes for easy identification. Sliding clip on backside of box for hanging on pegboards
- Cobalt M42 drill bit – provides upgraded M42 Cobalt jobber-length bits designed for durability, high heat resistance and Hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum
- Enhanced M42 alloy material – contains 8% Cobalt alloy that delivers 10x life vs. Standard bits
- High-heat resistant bits – withstand high-temperature applications for extended periods of time
- Thick web-helix design – provides additional stability in tough applications
- Surface-hardened tip – penetrates tough abrasive materials
- 【5% COBALT TWIST DRILL BITS SET】Made from M35 Cobalt Steel with Molybdenum and Cobalt added to form a hardened alloy, can measure up to 67 Rockwell hardness, cut faster, last longer, and last longer than normal HSS drill bits 12 times.
- 【SIZE】1/16x2, 5/64x2, 3/32x2, 7/64x2, 1/8x2, 9/64, 5/32, 11/64, 3/16x2, 7/32, 1/4, 5/16, 3/8, 1/2 inch bits; Comes in plastic storage case for easy storage
- 【TWIST DESIGN AND PERFORMANCE】Precise 135° SPLIT Point, Ti Surface and 3-Flat Shank. Prevents walking and removes chips and particles faster. Precision fully ground to ensure smooth chip movement.
- 【PROFESSIONAL AND WIDELY USED】M35 Cobalt High Speed Steel is more suitable for hardening materials. Ideal for cutting stainless steel, steel and cast iron as well as wood, aluminum alloys and other metals. Not suitable for glass or ceramic materials. Pay attention to speed, pressure and heat control when drilling.
- 【SERVICE】If you have any problem with our metric drill bit set or are not satisfied with the product, please feel free to contact WildBossy.
- Titanium Nitride Coating Pilot Point for Longer Life
- Starts on contact for cleaner holes
- No spin shanks
- Tapered web provides greater durability to reduce breaking
- Includes sizes from 1/16-inch to 1/2-inch in a plastic tough case
- High Quality Material - Premium High Speed Steel M35 (Cobalt 5%) provide extended tool life compared to ordinary drill bits when drilling hard materials.
- Characteristics - 135° split point with round straight shank, self-centering prevent walking, make drilling precise and faster. Fully Ground twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance.
- Widely Used - M35 Cobalt High Speed Steel is more suitable for tough, high tensile strength material. Particularly successful in cutting harden metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods.
- Specifications - Set of 13pcs jobber length drill bits includes: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64, 1/4.
- Organized Holder - The whole drill bit set are kept in Rose plastic case with size index holder for easy storage and organizing.
Choosing the Right Bits for Drilling Steel: Your Complete Buying Guide
Drilling into steel requires the right tools. Using the wrong drill bits makes the job slow and damages your bits. This guide helps you pick the best bits for steel.
Key Features to Look For
When buying drill bits for steel, look closely at these features. They make a big difference in how well the bit works.
- **Shank Type:** The shank is the part that grips the drill. Most bits have a round shank. Make sure the shank fits your drill chuck tightly. A loose fit causes slipping and heat.
- **Point Angle:** This is the tip of the bit. For hard steel, a sharper point (like 135 degrees) cuts better. Softer steel works well with a 118-degree point.
- **Flute Design:** Flutes are the spiral grooves. They remove chips (the tiny metal pieces) from the hole. Good flutes keep the bit cool and prevent jamming.
Important Materials: What Makes a Good Bit?
The material of the bit determines its strength and heat resistance.
High-Speed Steel (HSS)
Most standard bits are HSS. They work fine for thin or soft steel. HSS bits are affordable. They are a good starting point for general use.
Cobalt Bits (HSS-Co)
Cobalt bits mix HSS with 5% to 8% cobalt. This metal makes the bit much tougher. Cobalt bits handle high heat much better. They are best for drilling hard metals like stainless steel or cast iron.
Titanium Nitride (TiN) Coating
Some bits have a gold-colored coating called TiN. This coating reduces friction. Less friction means less heat builds up. TiN-coated bits last longer than plain HSS bits, but they are not as tough as solid cobalt.
Factors That Improve or Reduce Quality
Good quality bits last a long time. Poor quality bits break or dull quickly.
Quality Boosters
- **Split Point Tip:** High-quality bits often have a “split point.” This design lets the bit start cutting immediately. You do not need to use a center punch as much. This feature greatly improves accuracy.
- **Precision Grinding:** Bits that are ground very precisely run smoother. Smooth running reduces vibration and wear on the bit.
Quality Reducers
- **Soft Metal:** If a bit feels too light or soft, it likely uses low-grade steel. These bits dull almost immediately when drilling steel.
- **Poor Coating Adhesion:** If the coating chips off easily, the quality is low. A good coating stays put, even under stress.
User Experience and Use Cases
Think about what you need to drill. This helps you choose the right bit.
DIY Home Projects
For light tasks, like drilling thin sheet metal or basic shelving brackets, standard HSS bits are usually enough. Remember to use cutting fluid (oil).
Professional and Heavy-Duty Work
If you drill thick plate steel or stainless steel often, invest in cobalt bits. They handle the intense heat and pressure better. You will save money in the long run because you replace them less often.
The Importance of Speed and Lubrication
No matter the bit, drilling steel requires slow speeds. High speed creates too much heat. Heat ruins the hardness of the bit. Always use cutting fluid or oil. The oil cools the bit and helps carry away metal chips. This improves the final hole quality.
10 Frequently Asked Questions (FAQ) About Steel Drilling Bits
Q: What is the best type of bit for drilling stainless steel?
A: Cobalt (HSS-Co) bits are the best choice for stainless steel. Stainless steel is very hard and creates lots of heat. Cobalt handles that heat well.
Q: Do I need to use oil when drilling steel?
A: Yes, absolutely. Oil acts as a lubricant and a coolant. It keeps the bit from overheating and extends its life significantly.
Q: What speed should I use for drilling steel?
A: Use slow speeds. Slower speeds reduce friction and heat. Always use the slowest setting your drill allows for thick, hard steel.
Q: What does a 135-degree point angle mean?
A: A 135-degree point is a sharper angle than a standard 118-degree bit. This sharpness helps the bit bite into hard materials like steel more easily.
Q: What is the difference between HSS and Cobalt bits?
A: HSS is standard steel. Cobalt bits add cobalt metal, which makes them much more heat-resistant and durable for tough jobs.
Q: Can I use a regular wood drill bit on steel?
A: No, you should not. Wood bits are too soft. They will dull instantly or break when they hit hard steel.
Q: What is a ‘flute’ on a drill bit?
A: The flute is the spiral groove running up the side of the bit. Its job is to pull the metal chips out of the hole as you drill.
Q: How do I know if my bit is overheating?
A: If the bit changes color (turns blue or purple) or starts smoking, it is too hot. Stop drilling immediately and let it cool down.
Q: Should I use a center punch before drilling steel?
A: Yes, using a center punch creates a small divot. This divot stops the drill bit from “walking” or skating across the smooth steel surface when you start drilling.
Q: Are TiN-coated bits better than uncoated HSS bits?
A: Yes, TiN-coated bits generally last longer because the coating reduces friction and wear compared to plain HSS bits.