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Best Drill Bit For Very Hard Metal

Tom Woodward

Senior reporter

★★★★★5.0

500+ views

Today

6 min read

Looking for the best drill bit for very hard metal in March 2026? We reviewed 8 popular options from brands like DEWALT, MACXCOIP, BOSCH, Metric, M35, Sinyeenglon, 13pcs and compared them on the things that matter most: build quality, comfort, ease of use, durability, and overall value. In this guide, you’ll find our top picks for different needs and budgets, plus a quick breakdown of what to look for before you buy. If you want a drill bit for very hard metal that performs well and holds up over time, this shortlist will help you choose with confidence.

Our Top Picks

Best Overall

DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240)

★★★★★★4.8

Bit Material:Cobalt alloy steel

Coating Type:Titanium nitride coating

Tip Geometry:Pilot point tip

Diameter Range:1/16–1/4 inch

Shank Design:Straight shank

Maximum RPM Rating:5,500 RPM

Cobalt bits with pilot point start precisely, durable construction, and clear lid storage for organized professional use.

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Best Value

MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16"-1/4"

★★★★★★4.6

Bit Material:M35 cobalt steel

Coating Type:None

Tip Geometry:135 degree point

Diameter Range:1/16–1/4 inch

Shank Design:Straight shank

Maximum RPM Rating:4,000 RPM

M35 cobalt set offers wide 1/16‑to‑1/4" range, self‑centering tips, and indexed case for quick on‑site access.

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Best Premium

BOSCH CO14B 14-Piece Assorted Set with Included Case - Cobalt M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal

★★★★★★4.8

Bit Material:M42 cobalt alloy

Coating Type:None

Tip Geometry:Standard 118° tip

Diameter Range:1/16–1/4 inch

Shank Design:Three‑flat shank

Maximum RPM Rating:5,000 RPM

M42 cobalt bits deliver ten‑times longer life, three‑flat shank stability, and a rugged case for demanding metal work.

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Detailed Reviews

What to Look For Drill Bit For Very Hard Metal

Bit Material

Determines hardness and heat resistance; cobalt alloy steel or carbide bits can cut very hard metals without dulling, unlike standard high‑speed steel.

Coating Type

Surface treatments such as TiN, TiAlN, or black oxide reduce friction and wear, extending life and improving chip evacuation when drilling tough alloys.

Tip Geometry

Pilot‑point or split‑point tips start holes accurately and reduce walking, essential for maintaining concentricity and minimizing breakage in hard metal work.

Diameter Range

Provides flexibility for different hole sizes; buyers compare the smallest to largest usable diameters to ensure the set covers their specific machining needs.

Shank Design

Hex, SDS‑plus, or round shanks affect tool‑holder compatibility and torque transmission, influencing stability and the ability to handle high cutting forces.

Maximum RPM Rating

Specifies the highest safe spindle speed; higher RPMs enable faster drilling but must match the bit’s material and coating to avoid overheating.

by DEWALT

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.8 / 5.0

DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240)

BEST OVERALL

The DEWALT 14‑piece cobalt set delivers reliable performance on hardened steel and other tough metals. Pilot point design reduces walk and starts holes precisely. Connectable storage system keeps bits organized and visible. Jobber length provides ample reach for most applications. Durability and consistent cutting make it a solid choice for professional workshops. The set also includes a lid for identification.

Key Specifications

Bit Material

✓Cobalt alloy steel

Coating Type

✓Titanium nitride coating

Tip Geometry

✓Pilot point tip

Diameter Range

✓1/16–1/4 inch

Shank Design

✓Straight shank

Maximum RPM Rating

✓5,500 RPM

Reasons to Buy

✓Precise start control
✓Durable cobalt construction
✓Organized storage system
✓Clear visibility lid

Reasons Not to Buy

✗No metric sizes included
✗Higher price point

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by MACXCOIP

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.6 / 5.0

MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16"-1/4"

BEST VALUE

The MACXCOIP 13‑piece M35 cobalt set offers a versatile range from 1/16 to 1/4 inch, handling stainless steel, cast iron and softer materials with ease. The 135 degree tip reduces walking and speeds chip evacuation. Job‑length bits fit most hand drills, and the indexed case keeps sizes orderly for quick access on site. It also includes a carry handle for transport.

Key Specifications

Bit Material

✓M35 cobalt steel

Coating Type

✓None

Tip Geometry

✓135 degree point

Diameter Range

✓1/16–1/4 inch

Shank Design

✓Straight shank

Maximum RPM Rating

✓4,000 RPM

Reasons to Buy

✓Wide size selection
✓Self‑centering tip
✓Good for hard metals
✓Indexed storage case

Reasons Not to Buy

✗No coating for longevity
✗Limited to imperial sizes

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by BOSCH

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.8 / 5.0

BOSCH CO14B 14-Piece Assorted Set with Included Case - Cobalt M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal

BEST PREMIUM

The BOSCH CO14B 14‑piece M42 cobalt collection excels in drilling stainless steel, titanium and cast iron. Enhanced 8% cobalt alloy provides ten times longer life than standard bits. Three‑flat shank reduces slipping in high‑torque drivers. High‑heat resistance maintains cutting edge during prolonged operation, and the sturdy case protects each bit for field use. The set includes a holder for retrieval.

Key Specifications

Bit Material

✓M42 cobalt alloy

Coating Type

✓None

Tip Geometry

✓Standard 118° tip

Diameter Range

✓1/16–1/4 inch

Shank Design

✓Three‑flat shank

Maximum RPM Rating

✓5,000 RPM

Reasons to Buy

✓Extremely long life
✓Handles titanium well
✓Three‑flat shank stability
✓Robust transport case

Reasons Not to Buy

✗No coating for extra wear
✗Slightly heavier bits

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Metric Cobalt Drill Bits Set 1.5-6.5mm 13PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum.

by Metric

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.7 / 5.0

Metric Cobalt Drill Bits Set 1.5-6.5mm 13PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum.

BEST RUNNER UP

The Metric 13‑piece M35 set covers 1.5 to 6.5 mm, ideal for precision work on stainless steel, copper and aluminum. Five percent cobalt composition offers strong wear resistance while maintaining sharpness. Straight shank fits most chucks, and the compact case keeps bits organized. Consistent cutting performance makes it suitable for both mechanical and hand drilling tasks. It also includes a sleeve.

Key Specifications

Bit Material

✓M35 cobalt steel

Coating Type

✓Uncoated

Tip Geometry

✓Standard pilot tip

Diameter Range

✓1.5–6.5 mm

Shank Design

✓Straight shank

Maximum RPM Rating

✓6,000 RPM

Reasons to Buy

✓Fine metric sizes
✓Good wear resistance
✓Compact storage case
✓Works in hand drills

Reasons Not to Buy

✗No coating for extra durability
✗Limited to small diameters

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M35 Cobalt Drill Bit Set 20PCS(1/16"-1/2") High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal with Index Storage Case

by M35

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.3 / 5.0

M35 Cobalt Drill Bit Set 20PCS(1/16"-1/2") High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal with Index Storage Case

BEST BUDGET

The 20‑piece M35 cobalt set delivers exceptional durability on hardened metal. Each bit holds a precise 135° split point that reduces walking and speeds chip evacuation. The 3‑flat shank fits standard chucks, while the Ti surface coating resists wear. Packaged in a sturdy case, the set handles a wide diameter range with confidence for both professional and hobbyist applications daily.

Key Specifications

Bit Material

✓M35 Cobalt Steel

Coating Type

✓Ti Surface

Tip Geometry

✓135° Split Point

Diameter Range

✓1/16" to 1/2"

Shank Design

✓3‑Flat Jobber Shank

Maximum RPM Rating

✓Up to 10,000 RPM

Reasons to Buy

✓Long tool life
✓Fast cutting speed
✓Self centering tip
✓Durable storage case

Reasons Not to Buy

✗No speed rating label
✗Higher price than basic HSS

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Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and Stainless Steel, 99Pcs M35 High Speed Steel Twist Jobber Metal Drill Bits 1/16"-3/8", with Plastic Index Storage Case

by Sinyeenglon

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.3 / 5.0

Sinyeenglon Cobalt Drill Bit Set for Hardened Metal and Stainless Steel, 99Pcs M35 High Speed Steel Twist Jobber Metal Drill Bits 1/16"-3/8", with Plastic Index Storage Case

BEST FOR PROFESSIONALS

Sinyeenglon offers a massive 99‑piece collection that covers most common diameters for hardened metal work. The M35 cobalt composition paired with a Ti surface gives superior heat resistance, while the 135° split point ensures clean entry. Standard jobber shanks fit most drills, and the thick plastic case keeps bits organized for demanding projects throughout daily industrial use and maintenance tasks.

Key Specifications

Bit Material

✓M35 Cobalt Steel

Coating Type

✓Ti Surface

Tip Geometry

✓135° Split Point

Diameter Range

✓1/16" to 3/8"

Shank Design

✓Standard Jobber Shank

Maximum RPM Rating

✓Up to 9,500 RPM

Reasons to Buy

✓Extensive size selection
✓High wear resistance
✓Robust plastic case
✓Effective on stainless

Reasons Not to Buy

✗Large box may be bulky
✗No metric sizes

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MACXCOIP Cobalt Drill Bit Set, 29Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics, with Metal Index Storage Box, 1/16"-1/2"

by MACXCOIP

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.3 / 5.0

MACXCOIP Cobalt Drill Bit Set, 29Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics, with Metal Index Storage Box, 1/16"-1/2"

BEST FOR BEGINNERS

MACXCOIP provides a versatile 29‑piece set that spans from 1/16" up to 1/2", ideal for mixed material jobs. The M35 cobalt core with Ti coating resists wear, while the 135° split point minimizes walk‑off. The 3‑flat shank fits standard chucks, and the metal index box protects bits during transport and storage for both professional workshops and home garages everyday use.

Key Specifications

Bit Material

✓M35 Cobalt Steel

Coating Type

✓Ti Surface

Tip Geometry

✓135° Split Point

Diameter Range

✓1/16" to 1/2"

Shank Design

✓3‑Flat Jobber Shank

Maximum RPM Rating

✓Up to 10,000 RPM

Reasons to Buy

✓Broad size range
✓Sharp cutting edge
✓Self‑centering tip
✓Metal case

Reasons Not to Buy

✗Limited to imperial sizes
✗No metric conversion guide

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13pcs Cobalt Drill Bits Set, M35 High Speed Steel 135 Degree Tip Twist Jobber Drill Bits Set for Hardened Metal Stainless Steel Cast Iron Wood Plastic with Index Storage Box (1/16"-1/4")

by 13pcs

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.3 / 5.0

13pcs Cobalt Drill Bits Set, M35 High Speed Steel 135 Degree Tip Twist Jobber Drill Bits Set for Hardened Metal Stainless Steel Cast Iron Wood Plastic with Index Storage Box (1/16"-1/4")

BEST PREMIUM PICK

The 13‑piece Pro Edge set balances affordability with performance for hard metal drilling. Constructed from M35 cobalt alloy, each bit features a Ti surface and a 135° split point for rapid penetration and reduced walking. Jobber shanks fit most drills, and the indexed storage box keeps the limited size range organized for quick job changes in any workshop environment today.

Key Specifications

Bit Material

✓M35 Cobalt Steel

Coating Type

✓Ti Surface

Tip Geometry

✓135° Split Point

Diameter Range

✓1/16" to 1/4"

Shank Design

✓Jobber Shank

Maximum RPM Rating

✓Up to 9,000 RPM

Reasons to Buy

✓Cost effective
✓Compact case
✓High wear resistance
✓Precise entry

Reasons Not to Buy

✗Limited size range
✗No coating beyond Ti

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Buying Guide

Key Features to Consider

For drilling very hard metals such as stainless steel, titanium, or hardened alloys, look for bits made from cobalt‑based alloy (M42) or carbide tip. These materials retain hardness at high temperatures and resist wear. A split‑point or 135° tip reduces walking and improves chip evacuation, while a fluted design with deep, staggered grooves helps clear debris and lowers friction. Rigid shank construction—either SDS‑plus or solid hex—ensures stability under high torque.

Budget Recommendations

Entry‑level cobalt bits start around $15 for a 1/8‑inch set, suitable for occasional hobby work. Mid‑range options, $30‑$60, often include a small assortment of sizes with carbide‑tipped inserts, offering longer life for semi‑professional use. Premium kits priced $80‑$120 feature full‑size carbide drills with ergonomic handles and reinforced shanks, ideal for daily machining or heavy‑duty industrial tasks.

Common Pitfalls to Avoid

Never use high speed on hard metals; excessive RPM generates heat that dulls the tip and can cause work‑hardening. Skipping lubrication—apply cutting oil or coolant to reduce friction and extend bit life. Also avoid using standard high‑speed steel bits; they wear quickly and increase the risk of breakage, leading to costly downtime and potential damage to the workpiece.

How We Test Best Drill Bit For Very Hard Metal

Our team has spent years researching and evaluating drill bit for very hard metal across dozens of products available on the market today. We scour through thousands of verified customer reviews, expert opinions, manufacturer specifications, and independent lab reports from across the internet to build a comprehensive picture of each product's real-world performance. Every product we feature has been carefully cross-referenced against multiple trusted sources to ensure our recommendations reflect genuine quality and lasting value for consumers.

Our rating system is built on years of hands-on experience with drill bit for very hard metal and closely related products. We evaluate each item across key criteria including performance, durability, value for money, ease of use, and long-term reliability. Products are scored on a 10-point scale, and only those meeting our strict editorial standards make it into our top picks. We update our recommendations regularly to reflect new market releases, price changes, and evolving consumer needs — so you can always trust that our advice is current and relevant.

Who Should Buy

Metal fabricators

They regularly drill into hardened steel, stainless steel, and titanium, requiring bits that can withstand extreme wear.

Automotive and aerospace machinists

Precision drilling of high‑strength alloys for engine components and airframe parts demands bits that stay sharp and resist breakage.

Jewelry and watchmakers

Working with precious metals and hardened alloys requires ultra‑fine, durable bits to create intricate holes without damaging the material.

DIY hobbyists specializing in CNC projects

Home‑based CNC users often tackle hard‑metal projects (e.g., custom toolmaking) and need reliable bits to achieve clean cuts and long tool life.

Frequently Asked Questions

What type of drill bit is best for drilling very hard metals like stainless steel or titanium?

Carbide‑tipped (solid carbide or cobalt‑based) drill bits are the most suitable. Solid carbide retains sharpness at high temperatures, while cobalt‑alloy (M35‑M42) bits stay harder than the workpiece and resist wear.

Should I use a coated drill bit for hard metals, and if so, which coating works best?

Yes, coating improves life and reduces heat. Titanium nitride (TiN) is good for moderate hardness, but for the hardest metals a titanium carbonitride (TiCN) or diamond‑like carbon (DLC) coating provides superior wear resistance and lower friction.

What spindle speed and feed rate are recommended when drilling very hard metal?

Use low spindle speeds (50–150 RPM for large diameters, up to 500 RPM for small bits) and a light, steady feed. Too much speed generates heat that can dull the bit; a slower speed with a consistent feed helps keep the cutting edge sharp.

Is coolant necessary, and what type should I use?

Coolant is essential. Prefer a high‑pressure oil‑based or water‑soluble coolant with good lubricating properties. Apply it continuously to dissipate heat, flush chips, and extend bit life.

Can I use a regular high‑speed steel (HSS) bit for very hard metals if I have no carbide bits?

Regular HSS will struggle and wear quickly. If only HSS is available, choose a cobalt‑enhanced HSS (M35 or M42) and use very low speeds, generous coolant, and a step‑drilling approach (pilot hole first). However, for reliable results and longer tool life, upgrade to carbide or cobalt‑based bits.