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
- 【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 multi-blades drill tip 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
- 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.
- 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.
- 【Premium True 5% Cobalt Steel with 68 HRC】- The Marked Cobalt Content of Ordinary Drill Bits May be False, but This Drill Bits Set is Made of Cobalt Ore from Our Own Mine, Which Indeed Contains 5% Cobalt. Although the Cost and Price are Slightly Higher, It Usually is able to Provide 3X Heat,Wear and Chip Resistance and 3X Tool Life.
- 【Split Point Design and Fully Ground Process】- Compared with Other Ordinary Drill Bits, This Drill Bits Set is Particularly Suitable for Heavy Duty Work, Such as Cutting through Stainless Steel,Steel Plate,Iron Sheet, Cast Iron and Hardwood, and Drilling Out Bolts Studs and Screws.
- 【3X Efficiency + 3X Tool Life】- This Cobalt High Speed Steel Drill Bits Set is Typically Capable of Running 3 Times Faster. Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes.
- 【Sharp Drill Bit Edge】- This Kind of Drill Bits Beast Can Even Cut Hardened Metal into Long Iron Bars, While a Dull Drill Bit Can Just Slowly Wear Through Metal.
- 【13 Pieces Jobber Length Industrial 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 [DIA 1/64 Inch Increments]
- HSS Titanium Coating: The step drill has excellent sharpness and durability due to its high speed steel material and titanium coating
- 118° Split Point Tip & Dual-flute Design: increases cutting speed with self-centering and prevents walking, clears chips faster and allows particles to escape easily
- 50 Sizes in 5 Pcs: The step drill bit kit includes 5 standard pieces with totally 50 sizes for versatility, enough for your DIY needs
- Widely Application: Ideal for drilling holes in plastic, aluminum, iron and many other types of sheet metal (Not recommended for stainless steel & wood)
- Equipped with a well-organized case, make it more convenient for using and storing the step drills
- High Quailty Material: Manufactured from Industry grade M35 High Speed Steel with 5% Cobalt added, usually giving better Heat, Wear and Chip Resistance and Long Tool Life.
- 135° Split Point: The 135° fast cutting point is automatically centered and prevents walking, clears chips and particles faster. Making drilling precise, reducing friction and heat for a smooth chip movement.
- Professional Drill Bits: gold oxide finish and round straight shanks， fully ground spiral groove design with high grinding accuracy, for cutting stainless steel, steel and cast iron as well as wood, aluminum alloys and other metals.
- Set includes: 15pcs jobber length drill bit set with plastic storage case, includes 1/16" 2pc, 5/64" 1pc, 3/32" 2pc, 7/64" 1pc, 1/8" 2pc, 9/64" 1pc, 5/32" 1pc, 3/16" 1pc, 7/32" 1pc, 1/4" 1pc, 5/16" 1pc, 3/8" 1pc.
- QUALITY COMMITMENT: If for any reason you are not satisfied with your purchase, please contact us. We provide 30-day money back. 100% Satisfaction Guarantee for risk-free shopping!
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.