Ratings represent our editorial opinion, not Amazon's. LumberMensHomes is reader-supported and may earn an affiliate commission. Details

Best 3mm Drill Bit For Metal

Tom Woodward

Senior reporter

★★★★★5.0

500+ views

Today

6 min read

Looking for the best 3mm drill bit for metal in March 2026? We reviewed 8 popular options from brands like PATIKIL, HLOFIZI, 3mm, Cobalt, uxcell, METALLIXITY 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 3mm drill bit for metal that performs well and holds up over time, this shortlist will help you choose with confidence.

Our Top Picks

Best Overall

PATIKIL 3mm Drill Bit, Jobber Straight Shank M2 High-Speed Steel 135° Titanium Nitride (TiN) Coated for Stainless Steel Hard Metal - 2 Pack

★★★★★★4.8

Tool Material:M2 High-Speed Steel

Coating Type:TiN Coating

Tip Angle:135° Split Point

Flute Length:30mm Flute Length

Shank Design:Straight Shank

Maximum RPM:Up to 6500 RPM

Titanium‑nitride coated M2 steel 3mm bit drills clean holes fast, resists wear, and lasts through tough metals.

Check Price

Best Value

HLOFIZI 3mm Cobalt M35 Drill Bits (5 Pack), Metric Black and Gold Coated Twist Drill Bits for Hard Metal, Stainless Steel and Copper

★★★★★★4.6

Tool Material:M35 Cobalt Steel

Coating Type:Black Gold Coating

Tip Angle:135° Split Point

Flute Length:30mm Flute Length

Shank Design:Straight Shank

Maximum RPM:Up to 8000 RPM

Cobalt M35 3mm bits handle stainless, copper, and aluminum with heat resistance, rust‑proof coating, and burr‑free holes.

Check Price

Best Premium

3mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 10pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO

★★★★★★4.8

Tool Material:M35 Cobalt Steel

Coating Type:Titanium Coating

Tip Angle:135° Split Point

Flute Length:30mm Flute Length

Shank Design:Straight Shank

Maximum RPM:Up to 7500 RPM

Premium 3mm M35 cobalt set offers extreme heat resistance, titanium‑coated durability, smooth countersinks, and efficient chip removal.

Check Price

Detailed Reviews

What to Look For 3mm Drill Bit For Metal

Tool Material

Determines hardness and wear resistance; high‑speed steel (M2) handles medium hardness metals, while cobalt or carbide are needed for tougher alloys.

Coating Type

Reduces friction and heat buildup; TiN extends life on stainless steel, TiAlN offers higher temperature resistance, and black‑oxide provides basic corrosion protection.

Tip Angle

Affects start‑up accuracy and chip evacuation; a 135° split‑point cuts cleanly in steel, while larger angles are better for softer metals.

Flute Length

Longer flutes increase chip removal and depth‑of‑cut capability, but may reduce rigidity; 30 mm is typical for 3 mm bits in metal.

Shank Design

Straight or hex shanks affect tool holder compatibility and run‑out; a 6 mm straight shank fits most mini‑collet chucks and provides good stability.

Maximum RPM

Specifies the safe spindle speed; higher RPMs enable faster drilling in softer metals, while lower limits protect the bit when drilling hard steel.

by PATIKIL

X Score

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

★★★★★

4.8 / 5.0

PATIKIL 3mm Drill Bit, Jobber Straight Shank M2 High-Speed Steel 135° Titanium Nitride (TiN) Coated for Stainless Steel Hard Metal - 2 Pack

BEST OVERALL

The PATIKIL 3mm drill bits deliver reliable performance on a range of metals. M2 high‑speed steel provides hardness while the TiN coating resists wear and corrosion. The 135° split point starts clean holes, and the 30mm flute length removes chips efficiently. Ideal for hobbyists and professionals who need consistent results without frequent bit changes and excellent durability over time today.

Key Specifications

Tool Material

✓M2 High-Speed Steel

Coating Type

✓TiN Coating

Tip Angle

✓135° Split Point

Flute Length

✓30mm Flute Length

Shank Design

✓Straight Shank

Maximum RPM

✓Up to 6500 RPM

Reasons to Buy

✓Hardness for tough metals
✓Wear-resistant coating
✓Clean start point
✓Efficient chip evacuation

Reasons Not to Buy

✗No price listed
✗Requires coolant for hardest steels

Check Price

by HLOFIZI

X Score

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

★★★★★

4.6 / 5.0

HLOFIZI 3mm Cobalt M35 Drill Bits (5 Pack), Metric Black and Gold Coated Twist Drill Bits for Hard Metal, Stainless Steel and Copper

BEST VALUE

HLOFIZI 3mm M35 cobalt bits excel in drilling stainless steel, copper and aluminum. The cobalt alloy adds heat resistance, while the black‑gold coating shields against rust and high temperatures. Fully ground geometry creates burr‑free holes quickly. The five‑piece set offers good inventory for frequent users, though occasional flex may appear in very hard steel making it a reliable choice today.

Key Specifications

Tool Material

✓M35 Cobalt Steel

Coating Type

✓Black Gold Coating

Tip Angle

✓135° Split Point

Flute Length

✓30mm Flute Length

Shank Design

✓Straight Shank

Maximum RPM

✓Up to 8000 RPM

Reasons to Buy

✓High heat resistance
✓Rust protective coating
✓Burr-free hole quality
✓Five-piece convenience

Reasons Not to Buy

✗Potential flex in hard steel
✗No price information

Check Price

by 3mm

X Score

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

★★★★★

4.8 / 5.0

3mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 10pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO

BEST PREMIUM

The 10‑piece 3mm M35 cobalt set provides exceptional durability for stainless steel and cast iron. A titanium‑coated HSS core offers a hardened cutting edge, while two flutes clear chips and reduce heat. Staggered teeth deliver smooth countersinks and chatter‑free drilling. Ideal for precision work, though the larger pack may be excessive for occasional users providing value and flexibility overall.

Key Specifications

Tool Material

✓M35 Cobalt Steel

Coating Type

✓Titanium Coating

Tip Angle

✓135° Split Point

Flute Length

✓30mm Flute Length

Shank Design

✓Straight Shank

Maximum RPM

✓Up to 7500 RPM

Reasons to Buy

✓Extreme heat resistance
✓Long tool life
✓Efficient chip removal
✓Smooth countersink finish

Reasons Not to Buy

✗Large pack for small jobs
✗Higher cost per bit

Check Price

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.

★★★★★

4.7 / 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 RUNNER UP

This 13‑piece cobalt set covers sizes from 1.5mm to 6.5mm, suitable for stainless steel, cast iron and copper. The 5% cobalt alloy raises hardness and temperature tolerance, while the double‑edge geometry cuts without lingering. Spiral design improves chip evacuation. Versatile for both hobby and professional projects, yet it is not intended for glass or ceramics making it a reliable toolkit.

Key Specifications

Tool Material

✓M35 Cobalt Steel

Coating Type

✓No Coating

Tip Angle

✓135° Split Point

Flute Length

✓30mm Flute Length

Shank Design

✓Straight Shank

Maximum RPM

✓Up to 7000 RPM

Reasons to Buy

✓Wide size range
✓Cobalt hardness
✓Efficient chip clearance
✓Double-edge sharpness

Reasons Not to Buy

✗Not for glass or ceramics
✗No protective coating

Check Price

uxcell 5pcs Straight Shank Twist Drill Bits 3mm Gold Titanium & Black Nitride Coated High Speed Steel (HSS) 4341 with 3mm Shank for Stainless Steel Alloy Metal Plastic Wood

by uxcell

X Score

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

★★★★★

4.3 / 5.0

uxcell 5pcs Straight Shank Twist Drill Bits 3mm Gold Titanium & Black Nitride Coated High Speed Steel (HSS) 4341 with 3mm Shank for Stainless Steel Alloy Metal Plastic Wood

BEST BUDGET

These 3mm uxcell bits deliver consistent performance on stainless steel, aluminum and wood thanks to a hardened HSS core and dual gold‑titanium/black nitride coating. The 135° split point starts holes cleanly while 27mm flutes evacuate chips efficiently. Their straight shank fits most drills, making them a reliable choice for hobbyists and light‑duty projects and offers good value for money today.

Key Specifications

Tool Material

✓High Speed Steel

Coating Type

✓Gold Titanium & Black Nitride

Tip Angle

✓135° Split Point

Flute Length

✓27mm Flute Length

Shank Design

✓Straight Shank

Maximum RPM

✓10,000 RPM Max

Reasons to Buy

✓Durable dual coating
✓Sharp spiral flutes
✓Versatile material compatibility
✓Good chip evacuation

Reasons Not to Buy

✗Limited to low speed metals
✗Small pack size

Check Price

METALLIXITY Drill Bit (3mm) 2Pcs, 4241 High-Speed Steel Straight Shank Uncoated (Bright) 118° for Wood Plastic Iron Copper Aluminum Low Soft Metal

by METALLIXITY

X Score

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

★★★★★

4.4 / 5.0

METALLIXITY Drill Bit (3mm) 2Pcs, 4241 High-Speed Steel Straight Shank Uncoated (Bright) 118° for Wood Plastic Iron Copper Aluminum Low Soft Metal

BEST FOR PROFESSIONALS

METALLIXITY 3mm bits provide solid drilling into copper, aluminum, wood and soft steels thanks to a bright uncoated HSS shaft and a precise 118° point. The 32.5mm flutes clear chips, while the straight shank fits standard chuck sizes. Ideal for DIY repairs, they balance cost and performance but lack a wear‑resistant coating for tougher applications making them fit occasional use.

Key Specifications

Tool Material

✓High Speed Steel

Coating Type

✓Uncoated Bright Finish

Tip Angle

✓118° Split Point

Flute Length

✓32.5mm Flute Length

Shank Design

✓Straight Shank

Maximum RPM

✓12,000 RPM Max

Reasons to Buy

✓Bright finish reduces friction
✓Versatile across metals
✓Precise 118° point
✓Affordable two‑piece pack

Reasons Not to Buy

✗No protective coating
✗Higher wear on hard steel

Check Price

PATIKIL 3mm Drill Bit, Jobber Straight Shank M2 High-Speed Steel 118° Nitriding Black and Gold Finish for Stainless Steel Hard Metal - 6 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 3mm Drill Bit, Jobber Straight Shank M2 High-Speed Steel 118° Nitriding Black and Gold Finish for Stainless Steel Hard Metal - 6 Pack

BEST FOR BEGINNERS

PATIKIL 3mm M2 bits excel on stainless steel and other hard alloys thanks to a hardened core and a black‑gold nitriding finish that resists wear and corrosion. The 118° split point and 1.3‑inch flutes deliver clean entry and efficient chip removal. A six‑piece set provides good inventory, though the premium material raises the cost slightly making it worthwhile for professionals.

Key Specifications

Tool Material

✓M2 High Speed Steel

Coating Type

✓Black and Gold Nitriding

Tip Angle

✓118° Split Point

Flute Length

✓33mm Flute Length

Shank Design

✓Straight Shank

Maximum RPM

✓10,000 RPM Max

Reasons to Buy

✓M2 steel handles hard metals
✓Gold finish adds corrosion resistance
✓Six‑piece pack offers value
✓Sharp 118° point

Reasons Not to Buy

✗Higher price than basic bits
✗Limited to moderate speeds

Check Price

uxcell 12pcs Jobber Drill Bits 3mm (0.118") Black Nitride & Gold Titanium Coated M2 High Speed Steel (HSS) Twist Drill Bits for Stainless Steel Aluminum Alloy Metal

by uxcell

X Score

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

★★★★★

4.5 / 5.0

uxcell 12pcs Jobber Drill Bits 3mm (0.118") Black Nitride & Gold Titanium Coated M2 High Speed Steel (HSS) Twist Drill Bits for Stainless Steel Aluminum Alloy Metal

BEST PREMIUM PICK

uxcell 12‑piece 3mm set combines M2 high‑speed steel with black nitride and gold titanium layers for superior durability and reduced friction. The 135° split point initiates holes accurately, while 36mm flutes efficiently remove chips from stainless steel and aluminum. Ideal for workshop use, the larger quantity offers flexibility, though occasional users may find the pack size more than needed today.

Key Specifications

Tool Material

✓M2 High Speed Steel

Coating Type

✓Black Nitride & Gold Titanium

Tip Angle

✓135° Split Point

Flute Length

✓36mm Flute Length

Shank Design

✓Straight Shank

Maximum RPM

✓12,000 RPM Max

Reasons to Buy

✓Dual coating extends life
✓M2 steel tolerates heat
✓12‑piece set covers many jobs
✓Sharp 135° point

Reasons Not to Buy

✗Pack size may be excess
✗Requires proper coolant on hard steel

Check Price

Buying Guide

Key Features to Consider

When selecting a 3 mm drill bit for metal, prioritize material composition and coating. High‑speed steel (HSS) offers general durability, while cobalt‑alloy or carbide tips provide superior heat resistance for tougher alloys. A TiN (titanium nitride) or TiAlN coating reduces friction, extending tool life and delivering cleaner cuts. Also verify shank type (hex or round) for secure chuck grip, and ensure the bit’s tolerance and runout are within industry standards to maintain dimensional accuracy.

Budget Recommendations

For hobbyists and occasional use, a reputable HSS set with TiN coating typically ranges from $8 to $15 per 3 mm bit, offering a balance of performance and cost. Professionals tackling stainless steel or hardened alloys should invest in cobalt‑alloy or carbide bits, priced between $20 and $35 each, which justify the higher upfront expense through longer life and reduced breakage. Buying in multi‑piece kits can further lower per‑unit cost while ensuring you have spares for wear.

Common Pitfalls to Avoid

A frequent mistake is using a standard wood‑or plastic‑drill bit on metal, leading to rapid wear and unsafe breakage. Similarly, applying excessive feed pressure or running the drill at too low a RPM generates heat that dulls the cutting edge and can warp the workpiece. Finally, neglecting to lubricate with cutting oil not only shortens bit life but also compromises surface finish and may cause chip welding to the bit.

How We Test Best 3mm Drill Bit For Metal

Our team has spent years researching and evaluating 3mm drill bit for 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 3mm drill bit for 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

Jewelry makers

They need a tiny, precise drill bit to create holes in delicate metal components for clasps and settings.

DIY home‑repair enthusiasts

A 3 mm bit lets them quickly drill pilot holes in sheet metal for mounting fixtures or repairs.

Automotive hobbyists

When modifying or fabricating custom brackets, a small metal drill bit provides accurate holes without damaging surrounding parts.

Precision engineering students

Lab projects often require drilling exact, small‑diameter holes in metal parts to test tolerances and assembly techniques.

Frequently Asked Questions

What material should a 3 mm drill bit be made of for drilling metal?

For metal, a 3 mm drill bit should be made of high‑speed steel (HSS) or cobalt‑enhanced HSS (often labeled M35 or M42). These alloys retain hardness at high temperatures and resist wear when cutting steel, stainless steel, and aluminum.

Do I need a coating on a 3 mm metal drill bit?

A TiN (titanium nitride) or TiAlN coating can increase surface hardness and reduce friction, extending the bit’s life, especially when drilling hardened or stainless steel. However, a high‑quality HSS or cobalt bit works well uncoated for most general metal‑working tasks.

What RPM and feed rate are recommended for a 3 mm drill bit in metal?

Use a high spindle speed—typically 3,000–5,000 RPM for steel and up to 6,000 RPM for aluminum. Feed rates should be moderate: about 0.05–0.10 mm per revolution (≈2–4 mm/min). Adjust based on material hardness and ensure constant lubrication.

Is a pilot hole necessary when using a 3 mm drill bit on thick metal?

Yes. For metal thicker than 3 mm, start with a smaller pilot hole (e.g., 1.5–2 mm) to reduce torque and prevent the 3 mm bit from wandering or breaking. This also helps maintain a straight bore.

How can I prolong the life of my 3 mm metal drill bit?

Keep the bit sharp by periodically deburring and sharpening, use cutting fluid or lubricant to reduce heat, avoid excessive feed pressure, and let the bit cool between passes. Store bits in a dry case to prevent corrosion.

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.

View All Articles by Tom Woodward