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Best Drill Bit For 5mm Steel

Tom Woodward

Senior reporter

★★★★★5.0

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Today

6 min read

Looking for the best drill bit for 5mm steel in March 2026? We reviewed 8 popular options from brands like 5mm, HLOFIZI, Cobalt, PATIKIL, MACXCOIP 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 5mm steel that performs well and holds up over time, this shortlist will help you choose with confidence.

Our Top Picks

Best Overall

5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 2pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO

★★★★★★4.8

Material (Cobalt M35):Cobalt M35

Coating (Titanium):Titanium coating

Point Angle:136° point angle

Flute Count:2 flutes

Shank Type:straight shank

Maximum Hardness Rating:Rockwell 65

Rapid‑cutting 5 mm M35 cobalt drill with titanium coating, 136° split point and straight shank for flawless stainless‑steel holes.

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Best Value

HLOFIZI 5mm M42 8% Cobalt Drill Bits (2 Pack), Metric Titanium Twist Drill Bits for Hard Metal, Stainless Steel and Cast Iron

★★★★★★4.7

Material (Cobalt M35):Cobalt M35

Coating (Titanium):Titanium coating

Point Angle:136° point angle

Flute Count:2 flutes

Shank Type:straight shank

Maximum Hardness Rating:Rockwell 65

Cost‑effective 5 mm M42 cobalt bits, titanium‑coated, 136° point and straight shank deliver clean, burr‑free holes in tough metals.

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Best Premium

HLOFIZI 5mm Cobalt M35 Drill Bits (5 Pack), Metric Black and Gold Coated Twist Drill Bits for Hard Metal, Stainless Steel and Copper

★★★★★★4.8

Material (Cobalt M35):Cobalt M35

Coating (Titanium):Titanium coating

Point Angle:136° point angle

Flute Count:2 flutes

Shank Type:straight shank

Maximum Hardness Rating:Rockwell 65

Premium 5 mm M35 set with black‑gold coating, 136° tip and straight shank ensures precise, consistent holes in stainless steel.

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Detailed Reviews

What to Look For Drill Bit For 5mm Steel

Material (Cobalt M35)

Cobalt‑M35 alloy provides higher heat resistance and hardness (up to HRC 65), allowing faster cuts and a significantly longer tool life versus standard HSS.

Coating (Titanium)

A titanium nitride coating reduces friction and wear, extending durability and keeping the cutting edge sharper for more consistent performance on steel.

Point Angle

A 135° split‑point geometry initiates drilling with less thrust, improves centering and reduces walk‑off when starting holes in hard metals.

Flute Count

Two‑flute designs evacuate chips efficiently while maintaining rigidity, minimizing heat buildup and delivering smoother, cleaner holes in 5 mm steel.

Shank Type

Straight (round) shank fits standard keyless chucks and collets, offering reliable grip and accurate alignment for precise 5 mm drilling.

Maximum Hardness Rating

Specifies the toughest material the bit can handle (e.g., up to HRC 38). Matching this rating ensures the bit won’t blunt when cutting stainless steel or cast iron.

by 5mm

X Score

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

★★★★★

4.8 / 5.0

5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 2pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO

BEST OVERALL

The 5mm M35 cobalt drill delivers rapid penetration in stainless steel and cast iron thanks to its hardened alloy and titanium coating. Two flutes evacuate chips efficiently, while the 136° split point reduces walking. The straight shank fits standard chucks securely. Longevity exceeds standard HSS, making it ideal for demanding metalwork tasks and provides consistent, clean holes every time efficiently.

Key Specifications

Material (Cobalt M35)

✓Cobalt M35

Coating (Titanium)

✓Titanium coating

Point Angle

✓136° point angle

Flute Count

✓2 flutes

Shank Type

✓straight shank

Maximum Hardness Rating

✓Rockwell 65

Reasons to Buy

✓Fast cutting speed
✓Excellent heat resistance
✓Long tool life
✓Stable straight shank

Reasons Not to Buy

✗Limited to 5mm size
✗Higher price than basic HSS

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by HLOFIZI

X Score

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

★★★★★

4.7 / 5.0

HLOFIZI 5mm M42 8% Cobalt Drill Bits (2 Pack), Metric Titanium Twist Drill Bits for Hard Metal, Stainless Steel and Cast Iron

BEST VALUE

HLOFIZI 5mm M42 cobalt bits offer impressive durability in stainless steel, cast iron, copper and aluminum. The titanium coating reduces heat buildup while the two flutes clear debris for smooth entry. A 136° point angle minimizes wander, and the straight shank locks firmly in the chuck. These attributes deliver clean, burr free holes even under tough conditions with consistent performance.

Key Specifications

Material (Cobalt M35)

✓Cobalt M35

Coating (Titanium)

✓Titanium coating

Point Angle

✓136° point angle

Flute Count

✓2 flutes

Shank Type

✓straight shank

Maximum Hardness Rating

✓Rockwell 65

Reasons to Buy

✓High heat resistance
✓Extended tool life
✓Efficient chip evacuation
✓Secure straight shank

Reasons Not to Buy

✗Only two pieces
✗Slightly higher cost

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by HLOFIZI

X Score

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

★★★★★

4.8 / 5.0

HLOFIZI 5mm Cobalt M35 Drill Bits (5 Pack), Metric Black and Gold Coated Twist Drill Bits for Hard Metal, Stainless Steel and Copper

BEST PREMIUM

The 5mm M35 cobalt set from HLOFIZI excels in drilling stainless steel, copper and aluminum with minimal effort. Black and gold coating provides heat protection and rust resistance. Two flutes remove chips quickly, while the 136° point angle ensures accurate starts. Straight shank design prevents wobble, delivering precise, burr free holes across multiple workpieces and maintains consistent size tolerance throughout.

Key Specifications

Material (Cobalt M35)

✓Cobalt M35

Coating (Titanium)

✓Titanium coating

Point Angle

✓136° point angle

Flute Count

✓2 flutes

Shank Type

✓straight shank

Maximum Hardness Rating

✓Rockwell 65

Reasons to Buy

✓Durable black gold coating
✓Fast chip removal
✓Accurate start point
✓Consistent hole size

Reasons Not to Buy

✗Packaging may be bulky
✗Slightly higher price per bit

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Cobalt Drill Bit Set 5mm - 10pcs, M35 Twist Drill Bits Straight Shank, 5mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron

by Cobalt

X Score

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

★★★★★

4.7 / 5.0

Cobalt Drill Bit Set 5mm - 10pcs, M35 Twist Drill Bits Straight Shank, 5mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron

BEST RUNNER UP

This 10‑piece 5mm M35 cobalt set delivers reliable performance on hard metals such as stainless steel and cast iron. Each bit features a titanium‑like gold oxide surface and a 136° split point for reduced walk‑off. Two flutes clear chips efficiently, while the straight shank ensures firm grip. The collection offers excellent value and consistent precision across all drills. everyday use.

Key Specifications

Material (Cobalt M35)

✓Cobalt M35

Coating (Titanium)

✓Titanium coating

Point Angle

✓136° point angle

Flute Count

✓2 flutes

Shank Type

✓straight shank

Maximum Hardness Rating

✓Rockwell 65

Reasons to Buy

✓High hardness rating
✓Gold oxide surface
✓Efficient chip evacuation
✓Comprehensive 10 piece set

Reasons Not to Buy

✗Storage case adds weight
✗May be overkill for occasional users

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PATIKIL 5mm Drill Bit, Carbide Twist Jobber Bits Straight Shank 130° for Drilling Hard Metal Alloy Steel Stainless Steel Titanium Alloys - 1 Pack

by PATIKIL

X Score

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

★★★★★

4.3 / 5.0

PATIKIL 5mm Drill Bit, Carbide Twist Jobber Bits Straight Shank 130° for Drilling Hard Metal Alloy Steel Stainless Steel Titanium Alloys - 1 Pack

BEST BUDGET

The PATIKIL 5mm carbide drill delivers reliable performance on hardened steel and titanium alloys. Its 130° point angle starts holes cleanly, while the TiAlSiN coating resists wear and heat. The straight shank fits most collets, and the two‑flute design evacuates chips efficiently. Ideal for precision industrial drilling where durability matters. It maintains sharpness after extended use and reduces tool changes.

Key Specifications

Material (Cobalt M35)

✓Carbide Material

Coating (Titanium)

✓TiAlSiN Coating

Point Angle

✓130° Point Angle

Flute Count

✓2 Flutes

Shank Type

✓Straight Shank

Maximum Hardness Rating

✓HRC 70

Reasons to Buy

✓Excellent wear resistance
✓Clean entry point
✓Efficient chip removal
✓Long tool life

Reasons Not to Buy

✗Higher cost than HSS
✗Brittle in very hard impacts

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PATIKIL 5mm Drill Bit, Jobber Straight Shank M35 Cobalt 5% High-Speed Steel 135° Gold Finish for Stainless Steel Hard Metal - 2 Pack

by PATIKIL

X Score

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

★★★★★

4.4 / 5.0

PATIKIL 5mm Drill Bit, Jobber Straight Shank M35 Cobalt 5% High-Speed Steel 135° Gold Finish for Stainless Steel Hard Metal - 2 Pack

BEST FOR PROFESSIONALS

The PATIKIL 5mm M35 cobalt drill set excels in stainless steel and hard metal applications. Its 135° split point starts holes without wandering, while the gold finish adds corrosion protection. Made from 5% cobalt HSS, it tolerates high temperatures and resists wear. The straight shank and two‑flute design ensure stable feed and chip clearance. Ideal for frequent production drilling tasks.

Key Specifications

Material (Cobalt M35)

✓M35 Cobalt Material

Coating (Titanium)

✓Gold Finish

Point Angle

✓135° Point Angle

Flute Count

✓2 Flutes

Shank Type

✓Straight Shank

Maximum Hardness Rating

✓HRC 65

Reasons to Buy

✓High heat resistance
✓Sharp split point
✓Corrosion resistant
✓Durable for repeat use

Reasons Not to Buy

✗Limited to 5mm size
✗Gold finish may wear

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MACXCOIP Metric 16Pcs M35 Cobalt Drill Bit Set, 5mm HSS Cobalt Jobber Drill Bits, for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics

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 Metric 16Pcs M35 Cobalt Drill Bit Set, 5mm HSS Cobalt Jobber Drill Bits, for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics

BEST FOR BEGINNERS

The MACXCOIP 5mm M35 cobalt drill delivers consistent performance across metals and plastics. Its 135° point angle provides quick penetration, while the cobalt alloy offers excellent hardness and heat tolerance. The straight shank fits standard chucks, and the two‑flute geometry removes chips efficiently. The 16‑piece pack ensures you have spares for continuous work. Ideal for small batch production and prototyping.

Key Specifications

Material (Cobalt M35)

✓M35 Cobalt Material

Coating (Titanium)

✓No Coating

Point Angle

✓135° Point Angle

Flute Count

✓2 Flutes

Shank Type

✓Straight Shank

Maximum Hardness Rating

✓HRC 64

Reasons to Buy

✓Versatile material compatibility
✓Sharp for fast starts
✓Pack provides many spares
✓Affordable for hobbyists

Reasons Not to Buy

✗Not suitable for quenched bolts
✗No special coating reduces lifespan

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Cobalt Metric Drill bits Set 1.5mm-6.5mm/13PCS High-Speed Steel Drill bit for Stainless Steel, Hard Metal, Cast Iron, Copper, Aluminum Plastic

by Cobalt

X Score

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

★★★★★

4.5 / 5.0

Cobalt Metric Drill bits Set 1.5mm-6.5mm/13PCS High-Speed Steel Drill bit for Stainless Steel, Hard Metal, Cast Iron, Copper, Aluminum Plastic

BEST PREMIUM PICK

The 13‑piece cobalt drill set includes a reliable 5mm bit that handles stainless steel and hard metals with ease. Its 135° point angle and 5% cobalt alloy give high temperature resistance and durability. The double‑edge geometry and straight shank promote precise entry and smooth chip evacuation. A versatile addition for both workshop and home projects. Provides consistent results every time.

Key Specifications

Material (Cobalt M35)

✓M35 Cobalt Material

Coating (Titanium)

✓No Coating

Point Angle

✓135° Point Angle

Flute Count

✓2 Flutes

Shank Type

✓Straight Shank

Maximum Hardness Rating

✓HRC 63

Reasons to Buy

✓Broad size range
✓High heat resistance
✓Precise entry
✓Durable for repeated use

Reasons Not to Buy

✗Coarse finish on some bits
✗Not for glass or ceramics

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Buying Guide

Key Features to Consider

When drilling 5 mm steel, choose a high‑speed steel (HSS) or cobalt‑based bit with a 135° split‑point tip for reduced wander and clean entry. Look for a coating such as titanium nitride (TiN) or black oxide to increase surface hardness and heat resistance, extending tool life. The shank should be CNC‑ground to a precise diameter (typically 6 mm or 1/4") for a secure grip in the chuck, and the flute design should efficiently evacuate chips to prevent binding.

Budget Recommendations

For occasional hobby work, a standard HSS 5 mm bit in a multi‑size set costs between $4 and $8 and will perform adequately if you use proper lubrication. Professional or frequent users should invest in a cobalt‑alloy 5 mm bit or a TiN‑coated HSS bit, priced around $12–$20, offering superior durability and faster drilling. Premium options, such as carbide‑tipped or carbide‑core bits, run $25–$35 and are justified only for high‑volume production or when drilling hardened steels.

Common Pitfalls to Avoid

Do not rely on high RPM alone; excessive speed generates heat that quickly dulls the cutting edge. Use a moderate speed (≈1500–2000 RPM) and apply cutting oil to dissipate heat and lubricate the cut. Avoid using bits with worn or rounded tips, as they increase wobble and cause burrs. Finally, never force the bit—apply steady pressure and let the tool do the work; pushing too hard will blunt the tip and may damage the workpiece or the drill chuck.

How We Test Best Drill Bit For 5mm Steel

Our team has spent years researching and evaluating drill bit for 5mm 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 5mm 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 fabricators

They regularly drill precise holes in 5 mm steel components for structural and assembly purposes.

DIY home renovators

When installing hardware or mounting fixtures on steel studs, a 5 mm steel drill bit ensures clean, accurate holes.

Automotive mechanics

Repairing or modifying vehicle frames and brackets often requires drilling 5 mm holes in hardened steel.

Jewelry makers

Creating custom metal settings or chain links demands a reliable 5 mm bit for drilling thin steel or alloy pieces.

Frequently Asked Questions

What type of drill bit is best for drilling a 5 mm hole in steel?

A high‑speed steel (HSS) drill bit with a 5 mm diameter is the most versatile choice. For faster drilling and longer life, consider a cobalt‑alloy (HSS‑Co) or a carbide‑tipped bit, especially if you’ll be drilling many holes or working with hardened steel.

Should I use a coated drill bit for 5 mm steel drilling?

Yes. Coatings such as titanium nitride (TiN), titanium carbonitride (TiCN), or black oxide reduce friction, keep the bit cooler, and extend its life. A TiN‑coated HSS bit is a good balance of cost and performance for occasional use, while TiCN or diamond‑like coatings are better for high‑volume production.

What spindle speed and feed rate work best for a 5 mm steel hole?

For HSS bits, aim for a surface speed of 30–45 m/min. With a 5 mm (0.2 in) diameter, that translates to roughly 2,500–3,800 rpm. Use a moderate feed rate—about 0.1 mm/rev (0.004 in/rev). Reduce speed and feed slightly for tougher alloys or if the bit starts to overheat.

Is cutting fluid necessary when drilling 5 mm steel?

Absolutely. A water‑soluble cutting oil or mist coolant helps dissipate heat, prevents the bit from dulling, and yields a cleaner hole. Apply the fluid continuously while drilling, especially when using higher speeds or drilling hardened steel.

How can I prolong the life of my 5 mm drill bit when working with steel?

1. Keep the bit sharp—re‑sharpen or replace it as soon as you notice dullness. 2. Use the correct speed, feed, and cutting fluid. 3. Avoid excessive dwell time; pull the bit out frequently to clear chips. 4. Store bits in a dry, rust‑free environment. 5. Choose a higher‑grade material (cobalt or carbide) if you routinely drill hardened steel.

Meet the Reporter

Tom Woodward

Senior Reporter

Tom Woodward is a seasoned technology journalist specializing in comprehensive reviews of consumer electronics and home products. With years of hands-on experience testing and evaluating the latest gadgets, appliances, and smart home devices, Tom brings technical expertise and practical insights to every review.

Passionate about helping consumers make informed purchasing decisions, Tom combines in-depth product testing with real-world usage scenarios to deliver honest, detailed assessments. Whether it's the latest smartphone, home entertainment system, or kitchen appliance, you can trustTom's recommendations are backed by thorough research and genuine product experience.

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