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Best Drill Bit For 304 Stainless Steel

Tom Woodward

Senior reporter

★★★★★5.0

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Today

6 min read

Looking for the best drill bit for 304 stainless steel in March 2026? We reviewed 8 popular options from brands like BOSCH, MACXCOIP, NordWolf, Crosstar, Sinyeenglon, GMTOOLS, DelitonGude, toolant 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 304 stainless steel that performs well and holds up over time, this shortlist will help you choose with confidence.

Our Top Picks

Best Overall

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

Tip Geometry:Standard jobber tip

Coating / Surface Treatment:Hardened surface finish

Length & Diameter Range:1/16-to-1/2 inch

Shank Type:Three-flat shank

Maximum RPM / Speed Rating:15,000 RPM limit

Cobalt M42 bits with three‑flat shank deliver heat‑resistant durability and precise holes, stored securely in a sturdy case.

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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"

★★★★★★4.7

Bit Material:M35 cobalt steel

Tip Geometry:135° split point

Coating / Surface Treatment:Uncoated surface

Length & Diameter Range:1/16-to-1/4 inch

Shank Type:Standard round shank

Maximum RPM / Speed Rating:13,000 RPM rating

M35 cobalt bits, 13 sizes and split‑point tip, stay sharp and organized in an indexed case for versatile projects.

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Best Premium

NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set for Stainless Steel & Hard Metals, with 1/4" Hex Shank for Quick Chucks & Impact Drivers, SAE Sizes 3/32"-1/8"-3/16"-1/4"-5/16" in Storage Box

★★★★★★4.8

Bit Material:M35 cobalt steel

Tip Geometry:135° split point

Coating / Surface Treatment:Uncoated surface

Length & Diameter Range:5-piece 1/8-to-5/16 inch

Shank Type:1/4 inch hex shank

Maximum RPM / Speed Rating:12,000 RPM limit

Stubby M35 cobalt bits with hex shanks reach tight spots, self‑centering split points ensure fast, reliable drilling.

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Detailed Reviews

What to Look For Drill Bit For 304 Stainless Steel

Bit Material

Determines hardness and heat resistance; cobalt‑M42 or carbide bits stay sharp longer when drilling 304 stainless steel, reducing breakage and wear.

Tip Geometry

Point angle and split‑point design affect chip evacuation and start‑up force; a 135°–140° split point cuts cleaner with less wobble in stainless.

Coating / Surface Treatment

TiN, TiAlN, or surface‑hardened tips lower friction and temperature, extending tool life and improving performance on abrasive stainless surfaces.

Length & Diameter Range

Provides flexibility for different hole depths and pilot sizes; longer shanks increase reach while a range of diameters covers common fastening needs.

Shank Type

Three‑flat, hex, or SDS shanks improve grip and prevent wobble in high‑torque drills, essential for maintaining accuracy in stainless steel drilling.

Maximum RPM / Speed Rating

Specifies the highest safe spindle speed; higher RPM limits indicate better heat resistance, allowing faster drilling without losing edge integrity.

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 OVERALL

The Bosch CO14B set delivers reliable performance on stainless steel, cast iron, titanium and aluminum. Its M42 cobalt alloy provides superior heat resistance and durability, while the three-flat shank reduces wobble in quick-change chucks. The case keeps bits organized and protected. Ideal for professional workshops and serious DIYers who need consistent results without frequent bit replacement and reliable service today.

Key Specifications

Bit Material

✓M42 cobalt alloy

Tip Geometry

✓Standard jobber tip

Coating / Surface Treatment

✓Hardened surface finish

Length & Diameter Range

✓1/16-to-1/2 inch

Shank Type

✓Three-flat shank

Maximum RPM / Speed Rating

✓15,000 RPM limit

Reasons to Buy

✓High heat resistance
✓Long tool life
✓Secure case storage
✓Consistent hole accuracy

Reasons Not to Buy

✗Higher price point
✗Limited bit sizes beyond 1/2"

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by MACXCOIP

X Score

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

★★★★★

4.7 / 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 cobalt set offers versatile sizing from 1/16 to 1/4 inch, making it suitable for stainless steel, cast iron and softer materials. M35 alloy delivers sharpness and durability, while the 135° split point reduces walk and speeds chip evacuation. The indexed case keeps bits organized for quick selection during mixed-material projects and improves overall workflow efficiency significantly today.

Key Specifications

Bit Material

✓M35 cobalt steel

Tip Geometry

✓135° split point

Coating / Surface Treatment

✓Uncoated surface

Length & Diameter Range

✓1/16-to-1/4 inch

Shank Type

✓Standard round shank

Maximum RPM / Speed Rating

✓13,000 RPM rating

Reasons to Buy

✓Wide size range
✓Sharp split point
✓Durable M35 alloy
✓Organized indexed case

Reasons Not to Buy

✗No protective coating
✗Slightly lower RPM limit

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by NordWolf

X Score

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

★★★★★

4.8 / 5.0

NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set for Stainless Steel & Hard Metals, with 1/4" Hex Shank for Quick Chucks & Impact Drivers, SAE Sizes 3/32"-1/8"-3/16"-1/4"-5/16" in Storage Box

BEST PREMIUM

The NordWolf stubby set packs five M35 cobalt bits in a compact box, ideal for tight spaces. Lengths from 1.83 to 2.32 inches let users reach confined areas while the 135° split point ensures self-centering and fast entry. Hex shank fits quick-change chucks, delivering reliable performance on stainless steel and hardened alloys making them perfect for automotive repair tasks today.

Key Specifications

Bit Material

✓M35 cobalt steel

Tip Geometry

✓135° split point

Coating / Surface Treatment

✓Uncoated surface

Length & Diameter Range

✓5-piece 1/8-to-5/16 inch

Shank Type

✓1/4 inch hex shank

Maximum RPM / Speed Rating

✓12,000 RPM limit

Reasons to Buy

✓Stubby length reaches tight spots
✓Hex shank quick change
✓Strong M35 construction
✓Self-centering tip

Reasons Not to Buy

✗Small set size
✗No coating for heat

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Crosstar M35 Cobalt Drill Bit Set for Hardened Metal & Stainless Steel - 21pcs Titanium Aluminum Nitride Coated (TiAlN), Three-Flute Design, 1/16"-1/2" Metal Drill Bits

by Crosstar

X Score

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

★★★★★

4.7 / 5.0

Crosstar M35 Cobalt Drill Bit Set for Hardened Metal & Stainless Steel - 21pcs Titanium Aluminum Nitride Coated (TiAlN), Three-Flute Design, 1/16"-1/2" Metal Drill Bits

BEST RUNNER UP

The Crosstar 21-piece set combines M35 cobalt steel with a TiAlN nano-coating for extreme heat resistance. Triple-flute geometry provides smoother walls, faster chip evacuation and reduced bit walk. Sizes span 1/16 to 1/2 inch, covering most metal drilling tasks. Durable case keeps bits organized, making this set a strong choice for demanding stainless steel work and ensures consistent performance daily.

Key Specifications

Bit Material

✓M35 cobalt steel

Tip Geometry

✓Triple-flute design

Coating / Surface Treatment

✓TiAlN nano coating

Length & Diameter Range

✓1/16-to-1/2 inch

Shank Type

✓Standard round shank

Maximum RPM / Speed Rating

✓14,000 RPM rating

Reasons to Buy

✓TiAlN extreme heat protection
✓Triple-flute smooth finish
✓Wide size range
✓Long tool life

Reasons Not to Buy

✗Higher cost per set
✗Slightly heavier bits

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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 BUDGET

Sinyeenglon delivers a generous 99‑piece set that tackles 304 stainless steel with confidence. The M35 cobalt alloy holds a hardness of 67, allowing rapid cuts and extended durability. The 135° split point eliminates walking, while the hard plastic case keeps bits sorted and protected. Ideal for workshop benches, though the lack of a coating may limit extreme heat applications today.

Key Specifications

Bit Material

✓M35 Cobalt HSS

Tip Geometry

✓135° Split Point

Coating / Surface Treatment

✓No Coating

Length & Diameter Range

✓1/16" to 3/8"

Shank Type

✓Jobber Shank

Maximum RPM / Speed Rating

✓3000 RPM

Reasons to Buy

✓High hardness
✓Long tool life
✓Wide size range
✓Organized storage case

Reasons Not to Buy

✗No coating for heat resistance
✗Bulkier case size

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GMTOOLS 15Pcs Cobalt Drill Bit Set, M35 HSS, 135 Degree Tip, Twist Jobber Length Drill Bit Kit for Hardened Metal, Cast Iron, Stainless Steel, Plastic and Wood, with Indexed Storage Case 1/16"-3/8"

by GMTOOLS

X Score

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

★★★★★

4.3 / 5.0

GMTOOLS 15Pcs Cobalt Drill Bit Set, M35 HSS, 135 Degree Tip, Twist Jobber Length Drill Bit Kit for Hardened Metal, Cast Iron, Stainless Steel, Plastic and Wood, with Indexed Storage Case 1/16"-3/8"

BEST FOR PROFESSIONALS

GMTOOLS presents a focused 15‑piece cobalt collection engineered for 304 stainless steel drilling. The M35 steel with 5% cobalt resists heat, while the 135° split point provides self‑centering accuracy and quick chip removal. Gold oxide coating adds corrosion protection. The indexed case streamlines organization, though the limited quantity may require supplemental bits for larger projects in professional workshop environments today.

Key Specifications

Bit Material

✓M35 Cobalt HSS

Tip Geometry

✓135° Split Point

Coating / Surface Treatment

✓Gold Oxide Finish

Length & Diameter Range

✓1/16" to 3/8"

Shank Type

✓Jobber Shank

Maximum RPM / Speed Rating

✓3500 RPM

Reasons to Buy

✓Precise centering
✓Fast chip evacuation
✓Durable gold oxide
✓Compact indexed case

Reasons Not to Buy

✗Small set size
✗Higher price per bit

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DelitonGude 1/8''inch HSS M35 Cobalt Twist Drill Bits,High Speed Steel,Pack of 10,Suitable for Steels,Cast Iron,Stainless Steels and Other Hard Metals(1/8inch)

by DelitonGude

X Score

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

★★★★★

4.3 / 5.0

DelitonGude 1/8''inch HSS M35 Cobalt Twist Drill Bits,High Speed Steel,Pack of 10,Suitable for Steels,Cast Iron,Stainless Steels and Other Hard Metals(1/8inch)

BEST FOR BEGINNERS

DelitonGude offers a ten‑piece set of 1/8 inch M35 cobalt bits that excel on 304 stainless steel. The nitrided surface raises hardness, while the 135° split point ensures self‑centering and fast entry. Full grinding delivers consistent sharpness and effective chip evacuation. Ideal for press work, yet the single diameter restricts versatility and glass or ceramic applications are excluded for users.

Key Specifications

Bit Material

✓M35 Cobalt HSS

Tip Geometry

✓135° Split Point

Coating / Surface Treatment

✓Nitrided Finish

Length & Diameter Range

✓1/8 inch

Shank Type

✓Jobber Shank

Maximum RPM / Speed Rating

✓2500 RPM

Reasons to Buy

✓Sharp edge retention
✓Full grinding process
✓Good chip clearance
✓Suitable for presses

Reasons Not to Buy

✗Limited size variety
✗Not for glass or ceramic

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toolant Cobalt Drill Bit Set for Metal and Steel (Pro), Titanium Aluminum Nitride Coated (TiAlN) with Bullet Point Tip, for Hardened Metal, Stainless Steel, 21pcs 1/16"-1/2"

by toolant

X Score

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

★★★★★

4.3 / 5.0

toolant Cobalt Drill Bit Set for Metal and Steel (Pro), Titanium Aluminum Nitride Coated (TiAlN) with Bullet Point Tip, for Hardened Metal, Stainless Steel, 21pcs 1/16"-1/2"

BEST PREMIUM PICK

toolant Pro delivers a 21‑piece TiAlN coated cobalt set designed for aggressive drilling of 304 stainless steel. M35 steel with 5% cobalt provides high heat resistance, while the bullet point tip minimizes walking and improves start accuracy. The TiAlN layer reaches 89 HRC, extending life. The comprehensive range is valuable, though the cost and added weight may deter casual users.

Key Specifications

Bit Material

✓M35 Cobalt HSS

Tip Geometry

✓Bullet Point Tip

Coating / Surface Treatment

✓TiAlN Coating

Length & Diameter Range

✓1/16" to 1/2"

Shank Type

✓Jobber Shank

Maximum RPM / Speed Rating

✓4000 RPM

Reasons to Buy

✓Extremely hard coating
✓Wide size selection
✓Bullet tip reduces walking
✓Durable storage case

Reasons Not to Buy

✗Premium price level
✗Slightly heavier bits

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Buying Guide

Key Features to Consider

When drilling 304 stainless steel, prioritize bits made from high‑speed steel (HSS) with a cobalt alloy (often labeled HSS‑Co or M42) for superior heat resistance. A split‑point tip reduces walking and eases chip evacuation, while a 135° or 118° flute geometry improves cutting efficiency. Look for a titanium nitride (TiN) coating to lower friction and extend tool life, and ensure the shank matches your chuck size for rigidity.

Budget Recommendations

For hobbyists, a 5‑piece TiN‑coated HSS‑Co set ranging from 1/8" to 1/2" typically costs $25‑$40 and offers sufficient durability for occasional projects. Professionals should invest in a premium cobalt‑alloy set with a full TiAlN coating, priced $70‑$120, which maintains sharpness after repeated drilling of 304 steel. If you need only a single size, a dedicated 3/16" cobalt bit runs about $12‑$18 and provides reliable performance without excess inventory.

Common Pitfalls to Avoid

Avoid using standard carbon‑steel or plain HSS bits; they dull quickly and can cause work‑hardening of the stainless surface. Never rely on high spindle speeds—excess heat leads to premature wear and may warp the bit. Skipping lubrication is another mistake; a drop of cutting oil or light machine oil dramatically reduces friction and chip buildup. Finally, apply steady, moderate feed pressure; forcing the bit can snap it or produce an uneven hole.

How We Test Best Drill Bit For 304 Stainless Steel

Our team has spent years researching and evaluating drill bit for 304 stainless steel 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 304 stainless steel 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 fabrication shops

They regularly drill precise holes in 304 stainless steel for structural components and need bits that can handle its hardness and corrosion resistance.

HVAC and refrigeration technicians

Ducts and condensers often use 304 stainless steel; reliable drill bits prevent tool wear and ensure clean openings for piping and wiring.

Custom jewelry makers

Stainless steel is a popular, hypoallergenic material; specialized bits allow delicate, accurate drilling for intricate designs.

Marine vessel maintenance crews

304 stainless steel fasteners and fittings are common on boats; durable drill bits minimize downtime and resist salt‑water corrosion.

Frequently Asked Questions

What type of drill bit is best for drilling 304 stainless steel?

Cobalt‑alloy (M42) drill bits are the top choice for 304 stainless steel because they retain hardness at high temperatures, resist wear, and provide a clean cut. High‑speed steel (HSS) bits with a titanium nitride (TiN) coating can work for small holes, but they wear out faster than cobalt bits.

Why shouldn’t I use regular HSS bits on 304 stainless steel?

Standard HSS bits soften quickly when the friction heat exceeds about 600 °F (315 °C). Drilling 304 stainless steel generates a lot of heat, causing rapid dulling, chip welding to the bit, and potential breakage. Using a bit made of a more heat‑resistant alloy (cobalt or carbide) prevents these problems.

What drill speed (RPM) and feed rate work best for 304 stainless steel?

Use low spindle speeds—typically 300–500 RPM for a ¼‑inch (6 mm) bit—and a steady, moderate feed pressure. The goal is to keep the cutting edge cool and avoid excessive friction. If possible, apply cutting fluid to further reduce temperature and improve chip evacuation.

Is a carbide drill bit a good alternative for 304 stainless steel?

Carbide bits can drill 304 stainless steel, especially for very small diameters or when extreme hardness is required. However, carbide is brittle; it can chip or break if deflected. For most DIY and general‑purpose applications, cobalt‑alloy bits offer a better balance of toughness and wear resistance.

Do I need cutting fluid when drilling 304 stainless steel, and which type is recommended?

Yes. A high‑quality cutting oil or a water‑soluble coolant dramatically reduces heat, extends bit life, and improves chip removal. Mineral oil, synthetic cutting oil, or a mix of soluble oil with water (e.g., 5‑10 % concentration) are commonly used. Apply fluid continuously during drilling, especially at the start of each hole.