Ever found yourself staring down a stubborn stainless steel surface, needing to drill a clean, precise hole for a new kitchen gadget, custom mount, or a much-needed repair? Stainless steel, with its renowned durability and sleek finish, is a fantastic material for our kitchens, but it can be notoriously challenging to work with when it comes to drilling. The wrong bit can quickly dull, overheat, or worse, damage your beautiful appliance or countertop. But don’t you worry, my friend, because I’m here to guide you.
I’m Mohammad Maruf — the founder and writer behind KitchPrep. With over 15 years immersed in the world of culinary equipment and kitchen gear, my expertise comes from meticulously analyzing thousands of product specifications, scrutinizing countless real-world user experiences, and deep-diving into the metallurgical science behind tools that truly perform for home and professional kitchen projects.
Selecting the ideal drill bit can transform a frustrating task into a satisfying success, ensuring your kitchen projects are completed with professional-grade precision and longevity. Whether you’re upgrading your sink or installing new fixtures, finding the best drill bit for stainless steel is crucial for achieving flawless results and preserving your valuable kitchen investments.
How To Choose The Best Drill Bit For Stainless Steel
Drilling into stainless steel isn’t like drilling into wood or drywall; it requires specific tools and techniques to prevent dulling bits, overheating, and creating unsightly burrs. Here’s what to look for when selecting your next drill bit for those demanding kitchen tasks.
Material Matters: Cobalt vs. Carbide
For stainless steel, you absolutely need a bit made from a material harder and more heat-resistant than standard high-speed steel (HSS). Cobalt drill bits (typically M35 with 5% cobalt or M42 with 8% cobalt) are infused with cobalt, which significantly increases their hardness, heat resistance, and abrasion resistance. They’re excellent for general stainless steel work and offer a great balance of performance and durability. Carbide drill bits, on the other hand, are made from Tungsten Carbide, an even harder and more brittle material. They excel at drilling extremely hard, hardened, or abrasive steels and other tough alloys. While they offer superior performance in these conditions, they are less forgiving and best used with a drill press to avoid breakage due to side pressure or impact.
Point Geometry and Coatings
A 135-degree split point tip is crucial for drilling stainless steel. This design is self-centering, which prevents the bit from “walking” on the smooth surface, eliminating the need for a pilot hole or center punch for most applications. It also reduces the cutting force required, leading to faster penetration and less heat buildup. Beyond the material, coatings like Titanium Aluminum Nitride (TiAlN) or TiAlSi can further enhance a bit’s performance. These coatings add a layer of hardness, reduce friction, and improve heat resistance, allowing the bit to cut more efficiently and last longer, especially when dealing with the high temperatures generated by drilling stainless steel.
Selecting the Right Bit Type
The type of drill bit also plays a role in your success. Jobber length bits are the most common and versatile, suitable for a wide range of tasks. For drilling larger holes or progressively enlarging existing ones, step drill bits are fantastic. They feature multiple cutting diameters on a single bit, saving you from constantly changing bits. If you’re working in tight spaces, stubby drill bits with their shorter length and often hex shanks (for impact drivers) are invaluable. Always consider the specific demands of your project – the thickness of the stainless steel, the size of the hole, and the accessibility of the work area – when choosing your bit type.
Quick Comparison
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| Model | Type | Best For | Key Feature | Amazon |
|---|---|---|---|---|
| BOSCH CO14B | Cobalt Set | Overall Performance | M42 Cobalt (8%) for extreme hardness | AmazonCheck Price |
| DEWALT DWA1240 | Cobalt Set | Reliable Precision | Pilot Point tip for effortless starts | AmazonCheck Price |
| STROTON Metric M42 Cobalt | Metric M42 Set | Metric Projects | M42 Cobalt (8%) with excellent warranty | AmazonCheck Price |
| YFTOOL Carbide Set | Carbide Set | Extreme Hardness | TiAlSi coating for ultimate durability | AmazonCheck Price |
| VALYRIANTOOL S&D Cobalt | Large Cobalt Set | Large Diameter Holes | Reduced shank for bigger sizes | AmazonCheck Price |
| IRONANT 3 PCS Step Bits | Cobalt Step Bits | Progressive Hole Sizing | TiAlN coating with 4 spiral flutes | AmazonCheck Price |
| AMOOLO 31Pcs M35 Cobalt | Extensive M35 Set | Comprehensive Sizes | 31 jobber length bits for versatility | AmazonCheck Price |
| NordWolf Stubby M35 Cobalt | Tight Spaces | Compact Drilling | 1/4″ hex shank for quick changes | AmazonCheck Price |
| Drill America M42 Cobalt | Professional M42 | Aerospace Standard | M42 Cobalt (8%) in a unique round case | AmazonCheck Price |
| WildBossy 115PCS M35 Cobalt | Ultimate Collection | Every Size Imaginable | 115-piece set for all drilling needs | AmazonCheck Price |
| OXMUL M35 Step Drill Bit | Single Step Bit | Heavy Duty Enlarging | M2+3% Cobalt with TiAlN finish | AmazonCheck Price |
| COMOWARE 15Pcs M35 Twist | Budget M35 Set | General Metalwork | 135° split point with indexed case | AmazonCheck Price |
| RCINDUS 3/16″ Cobalt (20PCS) | Bulk 3/16″ | Repetitive Tasks | 20 pieces of a commonly used size | AmazonCheck Price |
| MACXCOIP 29Pcs M35 Cobalt | Versatile M35 | Broad Range of Sizes | M35 Cobalt with 135° point tip | AmazonCheck Price |
| MACXCOIP 13Pcs M35 Cobalt | Starter M35 Set | Basic Metal Drilling | Affordable M35 Cobalt for common tasks | AmazonCheck Price |
In‑Depth Reviews
1. BOSCH CO14B 14-Piece Assorted Set
Check Latest PriceWhen it comes to tackling tough kitchen projects, the BOSCH CO14B 14-Piece Cobalt M42 Drill Bit Set is a true workhorse. These bits are crafted from M42 cobalt, meaning they contain 8% cobalt alloy, which is a significant upgrade for durability and heat resistance compared to standard M35 bits. This makes them perfectly suited for stainless steel, cast iron, and other hard metals you might encounter during a kitchen renovation or appliance modification.
Home renovators consistently praise these bits for their ability to cut through metal like “butter,” even after repeated use. Many appreciate the enhanced M42 alloy material, noting its 10x longer life compared to standard bits. The thick web-helix design provides stability, and the surface-hardened tip ensures efficient penetration. One experienced DIYer shared how two bits from this set drilled over a hundred holes in mild steel angle iron, still cutting like new with proper speed and cutting oil, highlighting their impressive longevity.
This Bosch set is an exceptional investment for anyone who regularly works with challenging materials. Its superior heat resistance and robust construction mean less frustration and more successful projects, whether you’re installing a new stainless steel backsplash or modifying a metal shelving unit. The 3-flat shank also ensures a secure grip in your drill, preventing slippage during demanding tasks, making it my top recommendation for overall performance and value.
Why it’s great
- M42 Cobalt (8%) for superior hardness & heat resistance.
- 10x longer life than standard bits.
- Thick web-helix design for added stability.
- Surface-hardened tip penetrates tough materials easily.
- Reputable brand known for quality.
Good to know
- Higher price point than basic HSS sets.
- Bit sizes molded into case can be hard to read.
2. DEWALT Cobalt Alloy Steel Drill Bit Set, 14-Piece (DWA1240)
Check Latest PriceFor those who value a trusted brand and innovative design, the DEWALT Cobalt Alloy Steel Drill Bit Set delivers exceptional performance, especially for detailed kitchen projects. This 14-piece set is crafted from cobalt alloy steel, providing the necessary durability and heat resistance for drilling through stainless steel, iron, and other common metals found in home applications. The standout feature here is the patented Pilot Point tip, which truly sets it apart.
Appliance repair enthusiasts rave about how these bits eliminate the need for pre-drilling, saving time and effort on complex tasks. Many users, even amateurs, found these bits cut through metal sheeting and thick bolts with surprising ease when used with low speed and high pressure. One individual shared a compelling story of drilling through two inches of a Grade 8 bolt “like butter” to remove a rust-welded screw, a testament to the bits’ robust cutting power and longevity.
This set is an excellent choice for anyone needing reliable, precise drilling for metalwork, particularly around the kitchen or home. The integrated pilot tip makes starting holes effortless and accurate, while the durable cobalt alloy ensures a long working life. The connectable accessory storage system also keeps your bits organized and ready for your next culinary-inspired DIY project.
Why it’s great
- Patented Pilot Point tip for self-centering and no pre-drilling.
- Cobalt Alloy Steel offers excellent durability.
- Connectable storage system for organization.
- Cuts through tough metals efficiently.
- Trusted brand reputation.
Good to know
- Some users wish for more sizes in the set.
- Not explicitly M35 or M42 specified.
3. STROTON Metric M42 8% Cobalt Twist Drill Bits Set
Check Latest PriceFor those intricate kitchen projects that demand metric precision, the STROTON Metric M42 8% Cobalt Twist Drill Bits Set is an outstanding choice. This 19-piece set, ranging from 1mm to 10mm, is crafted from premium M42 cobalt steel, boasting an impressive 68-70 HRC Rockwell Hardness Scale. This high cobalt content (8%) ensures superior heat, wear, and chip resistance, making these bits incredibly effective for stainless steel, hardened metals, and aluminum.
Home DIYers working with European appliances or custom metric fittings consistently report these bits “eat steel for breakfast,” cutting through tough metals into long, clean chips rather than dust. The 135-degree split point design prevents walking and ensures quick, efficient penetration. Many users highlight the exceptional lifetime replacement warranty and responsive customer service, which readily replaces broken bits, even small, brittle M42 sizes that are prone to snapping under improper use.
If your kitchen endeavors frequently involve metric measurements or very hard materials, this STROTON set offers unparalleled value and performance. The bits are designed to run significantly faster and last much longer, making the cost-per-hole exceptionally low. Just remember to use proper drilling techniques—low speed, high pressure, and cutting fluid—to get the most out of these formidable tools.
Why it’s great
- Premium M42 8% Cobalt Steel for extreme hardness.
- 68-70 HRC for best heat, wear, and chip resistance.
- 135° Split Point for accurate, fast cutting.
- Excellent for stainless steel and hardened metals.
- Exceptional warranty and customer service.
Good to know
- Metric sizes only.
- Smaller bits can be brittle if misused.
- Size markings on bits are small.
4. YFTOOL 4pcs Carbide Drill Bit Set
Check Latest PriceWhen you’re facing materials that laugh at cobalt, the YFTOOL 4pcs Carbide Drill Bit Set steps up to the challenge. This set, featuring 1/16″, 1/8″, 3/16″, and 1/4″ bits, is constructed from solid Tungsten Carbide, making it ideal for the absolute hardest stainless steels, hot working steels, and other high-hardness metals (up to HRC55). The advanced TiAlSi coating significantly boosts hardness and oxidation resistance, ensuring these bits perform where others fail.
Precision machinists and hobbyists dealing with hardened bolts or thick stainless steel report these bits are “on another level,” cutting effortlessly like “butter” even without lubrication. The 135° point angle is optimized for hard materials, reducing cutting forces and preventing walking, while the 30° helix angle ensures rapid chip evacuation, minimizing heat and work hardening. One reviewer noted that these shorter, more rigid bits eliminate the need for spotting drills, saving significant time and effort.
This carbide set is a specialty tool for the most demanding kitchen-adjacent metalworking tasks. While more brittle than cobalt, their superior hardness means they will conquer materials that would instantly dull or break other bits. They are best utilized in a drill press for optimal control and to prevent lateral forces that could cause breakage, making them indispensable for anyone regularly working with exceptionally tough alloys.
Why it’s great
- Solid Tungsten Carbide for extreme hardness.
- Advanced TiAlSi coating for superior wear and heat resistance.
- Optimized 135° point and 30° helix for hard steels.
- Exceptional rigidity for precision drilling.
- Prevents chip blockage and controls workpiece temperature.
Good to know
- More brittle than cobalt, requires careful use (drill press recommended).
- Limited number of sizes in the set.
- Higher price point.
5. VALYRIANTOOL 8PCS Cobalt Drill Bits Set HSSCO M35
Check Latest PriceFor those larger-scale kitchen or workshop projects requiring substantial holes in stainless steel, the VALYRIANTOOL 8PCS Cobalt Drill Bits Set is an excellent solution. This set features M35 HSSCO bits ranging from 9/16″ to 1″ with a convenient 1/2″ reduced shank. This design allows you to use these larger bits in standard 1/2″ drill chucks, making them accessible without needing specialized heavy-duty drills.
Skilled tradespeople and serious DIYers needing to drill wider holes in materials like cast iron, zinc alloy, and stainless steel praise these bits for their robust performance. The black and gold polished treatment enhances lubricity and wear resistance, while the 135-degree split point ensures accurate centering and fast penetration. One professional shared an impressive experience using the 1 3/8″ bit in a mag drill to ream out a sloppy service crane boom pin, noting it “held up extremely well” even under harsh conditions with plenty of cutting fluid.
If your projects call for drilling large diameter holes in tough metals, this VALYRIANTOOL set provides the necessary strength and versatility. The reduced shank design is a practical feature, expanding the capabilities of your existing drill. Just remember to maintain slow speeds and use cutting fluid to maximize their lifespan and performance, ensuring smooth, clean cuts even in demanding applications.
Why it’s great
- M35 HSSCO for hardness and toughness.
- Reduced 1/2″ shank allows use in standard drills.
- Black and gold finish for lubricity and wear resistance.
- 135° split point for accurate centering.
- Excellent for larger diameter holes in tough metals.
Good to know
- Limited to larger sizes (9/16″ to 1″).
- One user reported a low-quality bit in their set.
6. IRONANT 3 PCS Cobalt M35 Step Drill Bits Set
Check Latest PriceFor kitchen remodelers or DIY enthusiasts needing to create or enlarge holes with precision and ease, the IRONANT 3 PCS Cobalt M35 Step Drill Bits Set is a fantastic asset. These bits are made from M35 HSS with 5% cobalt and further enhanced with a TiAlN coating, making them incredibly sturdy and durable for stainless steel, metal, aluminum, and plastic. The spiral flute design and multiple steps simplify the process of achieving various hole sizes with a single bit.
Home improvement hobbyists find these step bits cut faster and smoother than traditional twist bits, allowing chips to escape easily and preventing material tearing. The 118° split point tip increases cutting speed with self-centering, preventing walking on slick surfaces. Many users have successfully used them to widen holes in squat racks or thick metals, praising their ability to remain sharp after numerous uses, even on stainless steel.
This IRONANT set is ideal for anyone looking for a versatile and efficient way to drill multiple hole sizes or progressively enlarge existing ones. The TiAlN coating and cobalt steel construction ensure longevity and performance on tough materials, making them a valuable addition to your toolkit for any kitchen-related fabrication or repair. Just remember to use appropriate speed and pressure, especially on thinner materials, to prevent bit breakage.
Why it’s great
- M35 Cobalt HSS with TiAlN coating for durability.
- 4 spiral flutes for faster, smoother cutting and chip escape.
- 118° Split Point tip for self-centering.
- Three bits cover a wide range of sizes (1/8″ to 7/8″).
- Excellent for progressive hole sizing in sheet metal.
Good to know
- One user reported a bit shattering on thin gauge steel due to slipping.
- 118° point is less aggressive than 135° for initial bite.
7. AMOOLO Cobalt Drill Bit Set 31Pcs
Check Latest PriceFor those who need a wide array of sizes to tackle diverse kitchen and home projects, the AMOOLO Cobalt Drill Bit Set offers an impressive 31 pieces. These jobber length bits are made from industry-grade M35 high-speed steel with 5% cobalt, ensuring increased wear-resistance and durability, especially when cutting through hard metals like stainless steel, cast iron, and even softer materials like wood and plastic.
Culinary DIYers and home repair enthusiasts appreciate the comprehensive range of sizes, from 1/16″ to 1/2″, making it easy to find the right bit for almost any task. The fully ground spiral groove design is effective at clearing chips quickly, reducing friction and heat for a cooler, faster drilling experience. Many users have found these bits to be exceptionally sharp and effective, with one expressing delight after trying five different cobalt sets, stating this one “drilled the hole in mild steel almost like butter.”
This AMOOLO set is a fantastic investment for anyone who frequently encounters varied drilling needs in metal. The combination of M35 cobalt steel, efficient design, and a vast size selection ensures you’re well-equipped for anything from delicate pilot holes to larger fixture installations. Remember to manage speed, pressure, and heat to maximize the lifespan of these capable bits.
Why it’s great
- 31 pieces cover a wide range of sizes (1/16″ to 1/2″).
- M35 Cobalt HSS for enhanced durability and wear resistance.
- Fully ground spiral groove for efficient chip removal and cooler drilling.
- 135° Split Point prevents walking.
- Suitable for various hard and soft materials.
Good to know
- Some bits may not be as sharp as others in the set.
- Case might not be as robust as premium options.
8. NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set
Check Latest PriceFor those tricky kitchen installations or repairs in confined spaces, the NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set is a compact powerhouse. These precision-ground M35 cobalt steel bits are designed with a stubby length (1.83 to 2.32 inches), allowing access to hard-to-reach areas where standard bits simply won’t fit. The 1/4-inch hex shank makes them perfectly compatible with quick-change chucks and impact drivers, adding to their versatility.
Appliance technicians and DIYers working on tight under-sink installations or behind heavy equipment commend these bits for their ability to drill quickly and cleanly through stainless steel, cast iron, and other hardened metals. The 135° split point tip ensures perfect self-centering and fast drilling, minimizing walk-off. Many users have successfully drilled out stubborn bolts from cast iron motor blocks and cut through 1/8″ stainless steel with ease, emphasizing their robust performance in demanding situations.
This NordWolf set is an essential addition for anyone needing to drill into metal in constrained environments. The stubby design combined with durable M35 cobalt steel makes them incredibly effective and convenient. Remember to use cutting oil and appropriate speed to preserve the bit’s sharpness, especially when tackling challenging materials like stainless steel, to ensure lasting performance.
Why it’s great
- Stubby length for hard-to-reach and tight spaces.
- M35 Cobalt steel for extra durability and long life.
- 1/4″ hex shank for quick-change chucks and impact drivers.
- 135° split point for self-centering and fast drilling.
- Suitable for stainless steel and various hardened metals.
Good to know
- Limited to 5 common imperial sizes.
- One user reported bits not drilling stainless steel effectively.
- Cobalt can be brittle, requiring careful handling.
9. Drill America – D/A29J-CO-PC 29 Piece M42 Cobalt Drill Bit Set
Check Latest PriceFor serious DIYers and professionals who demand top-tier performance and a comprehensive range of sizes, the Drill America 29 Piece M42 Cobalt Drill Bit Set is a standout. Manufactured to Aerospace Standard 907, these M42 cobalt drills contain 8% cobalt, providing superior red hardness and allowing for speeds up to 30% greater than conventional M2 HSS. This set is engineered to tackle tough, high tensile strength materials like stainless steel, Inconel, and titanium with exceptional efficiency.
Experienced users consistently praise these bits for their genuine cobalt-alloy construction and ability to “melt through” various steels, including hardened and stainless varieties, when used with proper speed and cutting oil. The gold oxide finish acts as a lubricant and enhances wear resistance, contributing to extended tool life. One satisfied customer shared a story of chipping a bit due to user error (leaving a hammer drill in hammer mode) and Drill America’s exceptional customer service replaced it at no cost, even without a formal warranty for such incidents.
This Drill America set is an investment in professional-grade quality, ideal for those who frequently work with challenging metals and need a wide range of precise sizes. The robust M42 cobalt material ensures outstanding durability and cutting performance, while the unique round case offers convenient portability and storage. Just remember to treat these high-performance bits with the care they deserve, using appropriate techniques and lubrication.
Why it’s great
- M42 Cobalt (8%) for superior red hardness and speed.
- Manufactured to Aerospace Standard 907.
- Gold oxide finish for lubricity and wear resistance.
- 29 pieces cover a comprehensive range of sizes (1/16″ – 1/2″).
- Unique round case for portability and easy access.
Good to know
- Higher price point.
- Some smaller bits may arrive chipped.
- Round shanks may slip in chucks without flats.
10. WildBossy M35 5% Cobalt Drill Bits Set 115PCS
Check Latest PriceFor the ultimate versatility and preparedness in any kitchen or workshop project, the WildBossy M35 5% Cobalt Drill Bits Set offers an astounding 115 pieces. This extensive collection includes fractional (1/16″ to 1/2″), letter (A-Z), and numbered (#1-#60) sizes, all crafted from M35 cobalt steel. With molybdenum and cobalt added, these bits achieve up to 67 Rockwell hardness, promising faster cutting and a lifespan up to 12 times longer than standard HSS bits.
Dedicated hobbyists and workshop owners find this set to be an invaluable resource, providing “every size imaginable” for virtually any drilling task. The precise 135° split point, gold oxide surface, and round straight shank work together to prevent walking and ensure smooth chip evacuation. Many users confirm these bits “go through Captain America’s shield like butter” when used with cutting oil and slow speeds, highlighting their robust performance on stainless steel and other hard metals.
If you’re looking for a single, comprehensive drill bit solution that covers every possible size and material from stainless steel to wood, the WildBossy 115-piece set is an exceptional choice. It’s designed for maximum utility and longevity, ensuring you always have the right bit on hand for any project. Just remember that with such a large set, proper organization within its metal indexed storage case is key to efficiently finding the bit you need.
Why it’s great
- Massive 115-piece set with fractional, letter, and numbered sizes.
- M35 Cobalt Steel for high hardness (up to 67 Rockwell) and durability.
- 135° Split Point and gold oxide surface for efficient drilling.
- Lasts up to 12 times longer than standard HSS bits.
- Comes in a metal indexed storage case for organization.
Good to know
- Higher initial investment.
- One user reported a small bit snapping on a grade 8 stud.
- Such a large set may be overkill for casual users.
11. OXMUL M35 Step Drill Bit for Metal, 3/16 to 7/8
Check Latest PriceFor precision hole enlargement or drilling multiple sizes with a single tool, the OXMUL M35 Step Drill Bit is an indispensable component for any serious kitchen or home workshop. This heavy-duty bit, made from M2+3% Cobalt steel and coated with Titanium Aluminum Nitride (TiAlN), is designed to drill through tough materials like stainless steel, galvanized steel, and other metals with remarkable ease and longevity. Its 12 steps cover a wide range from 3/16″ to 7/8″.
Home renovators and DIY mechanics consistently report this step bit “cut through stainless steel like butter” and remained sharp after multiple holes, making the process quick and painless. The 2-straight-flute design efficiently clears chips, contributing to faster drilling performance. Users have successfully used it to enlarge sink holes, drill into thick steel platforms, and even old iron rotors, praising its toughness and “work horse” capability.
This OXMUL step bit is an excellent investment for specific tasks requiring precise, multi-size drilling in hard metals. Its robust cobalt steel construction and TiAlN coating ensure it stands up to heavy use, making it ideal for custom kitchen sink installations, appliance modifications, or any project where you need to create clean, progressively larger holes in tough materials.
Why it’s great
- Heavy-duty M2+3% Cobalt steel for durability.
- TiAlN coating enhances life and drilling speed.
- 12 steps cover a wide range (3/16″ to 7/8″).
- 2-straight-flute design for fast chip clearance.
- Excels at drilling stainless steel and hard metals.
Good to know
- Only a single bit, not a set.
- No specific cutting angle listed.
12. COMOWARE 15Pcs Drill Bit Set (1/16″-3/8″), M35 HSS
Check Latest PriceFor those seeking an affordable entry into cobalt drill bits for stainless steel, the COMOWARE 15Pcs Drill Bit Set offers a solid option. Made from M35 high-speed steel with 5% cobalt, these jobber length twist bits provide superior wear, heat, and abrasion resistance compared to standard HSS bits. This set includes 15 pieces, covering common sizes from 1/16″ to 3/8″, making it suitable for a variety of metalworking and general DIY tasks.
Homeowners and general DIYers find these bits effective for drilling through steel, cast iron, and even solid stainless steel bars when used correctly. The 135° split point tips are self-centering, ensuring effortless penetration with minimal pressure and efficient chip clearance. Many users recommend using high pressure and low speed, along with cutting oil, to achieve optimal results and prolong bit life, noting that the bits perform well when these techniques are applied.
This COMOWARE set represents good value for general metal drilling, especially for occasional use on stainless steel and other hard alloys. While an expert cautioned against treating them as “general purpose bits” due to cobalt’s inherent brittleness, when used specifically for hard metals with proper technique, they deliver commendable performance. It’s a pragmatic choice for those who need cobalt capabilities without a premium price tag.
Why it’s great
- M35 Cobalt HSS for improved wear and heat resistance.
- 15-piece set covers common sizes (1/16″-3/8″).
- 135° split point for self-centering and quick cutting.
- Good value for the price.
- Includes metal indexed storage case.
Good to know
- One reviewer experienced a bit burning up on galvanized steel.
- Not as durable as higher-end M42 cobalt options.
- Small bits can be brittle if misused.
13. RCINDUS (20PCS) 3/16″ Cobalt Drill Bit
Check Latest PriceFor repetitive tasks or projects that frequently consume a specific size of drill bit, the RCINDUS (20PCS) 3/16″ Cobalt Drill Bit set offers exceptional value. These M35 cobalt high-speed steel bits are designed for durability and precision, making them ideal for cutting through steel, stainless steel, cast iron, and hard plastics. Having 20 pieces of a commonly used size like 3/16″ means you’re always prepared for the next task without interruption.
Home builders and serious DIYers who go through pilot bits quickly find this set to be a significant advantage, often praising their surprising strength and durability. Many users report drilling dozens of holes into steel frames without noticeable damage to the cutting surface, even without cooling oil or pilot holes in some cases. The 135-degree split point tip ensures drilling accuracy and prevents walking, providing clean and precise holes consistently.
This RCINDUS bulk pack is a smart choice for anyone who finds themselves constantly replacing 3/16″ bits due to wear or breakage. The cobalt steel composition enhances resistance to wear and extends their lifespan, making them a cost-effective solution for high-volume or demanding drilling operations in the kitchen or workshop. It’s a practical way to keep your projects moving without constant trips to the hardware store.
Why it’s great
- 20 pieces of a popular 3/16″ size.
- HSS M35 cobalt steel for durability and heat resistance.
- 135-degree split point tip for accuracy.
- Excellent value for high-volume use.
- Surprisingly strong and durable, even under abuse.
Good to know
- Only one size included.
- Uncoated finish.
14. MACXCOIP Cobalt Drill Bit Set, 29Pcs M35 High Speed Steel
Check Latest PriceFor those who need a broad spectrum of sizes for varied drilling demands, the MACXCOIP 29Pcs M35 Cobalt High Speed Steel Drill Bit Set is a comprehensive and reliable option. This set features 29 jobber length bits, ranging from 1/16″ to 1/2″, making it suitable for a wide array of materials including stainless steel, cast iron, copper, aluminum, and even wood and plastic. The M35 cobalt infusion significantly enhances durability and sharpness.
Home craftsmen and shop users frequently commend this set for its strong performance on harder materials, noting that the bits stay sharp and cut cleanly when used with proper speed and pressure. The 135-degree point tip and twist design facilitate faster cutting, self-centering, and efficient chip removal. Many have successfully used these bits to clear stripped screw heads and drill through stainless steel plates, confirming their effectiveness in challenging situations.
This MACXCOIP set offers an excellent balance ofvalue and versatility for anyone tackling a wide range of drilling tasks, particularly those involving stainless steel. The robust construction and broad size selection make it a solid upgrade from standard HSS bits, ensuring you’re well-equipped for most home and shop applications. Just be mindful that smaller bits, while effective, may require a bit more finesse on very hard materials.
Why it’s great
- Comprehensive 29-piece set (1/16″ to 1/2″).
- M35 Cobalt HSS for durability and sharpness.
- 135° point tip for self-centering and fast cutting.
- Effective on stainless steel, cast iron, and other hard metals.
- Includes a strong metal index storage box.
Good to know
- Some smaller bits reported to be less sharp or break easily.
- Round ends can be annoying in chuck.
15. MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel
Check Latest PriceFor those just starting out with metal drilling or needing a compact, budget-friendly set for occasional stainless steel tasks, the MACXCOIP 13Pcs M35 Cobalt High Speed Steel Drill Bit Kit is a solid entry point. This set includes essential sizes from 1/16″ to 1/4″, making it suitable for common small-to-medium drilling needs in stainless steel, cast iron, wood, and plastic. The M35 cobalt steel construction provides a significant upgrade in durability and cutting performance over standard HSS bits.
New DIYers and home users find these bits perform well on harder materials, staying sharp and cutting cleanly when used with appropriate technique. The 135-degree point tip and twist design ensure faster cutting and self-centering, preventing walk-off and aiding in efficient chip removal. Many have successfully used them for metal drilling, including stainless steel plates, noting they handled the job without overheating or dulling quickly, representing good value for the price.
This MACXCOIP 13-piece set is an excellent choice for basic metal drilling tasks around the kitchen or home workshop. It provides the necessary cobalt performance for stainless steel without a large investment, making it accessible for beginners or those with infrequent needs. Just be aware that, like with many budget sets, the very smallest bits might require a bit more care and may not be as robust as their larger counterparts.
Why it’s great
- Affordable M35 Cobalt HSS set for entry-level use.
- 13 pieces cover common sizes (1/16″ to 1/4″).
- 135° point tip for self-centering and faster cutting.
- Good performance on stainless steel and hard metals for the price.
- Includes an index storage case for easy organization.
Good to know
- Smaller bits reported to be duller or break easily.
- Limited size range compared to larger sets.
- One user found quality “shoddy” with some bits.
Understanding the Specs
Cobalt Content (M35 vs. M42)
The “M” designation (e.g., M35, M42) refers to the type of high-speed steel (HSS) alloy used in the drill bit. M35 HSS contains 5% cobalt, while M42 HSS contains 8% cobalt. The higher cobalt content in M42 bits provides increased hardness, heat resistance, and wear resistance, making them superior for drilling extremely hard or abrasive materials like hardened stainless steel and exotic alloys. However, M42 bits are also more brittle and prone to snapping if subjected to excessive side pressure or impact, making M35 a more forgiving choice for general use.
Point Angle (135° vs. 118°)
The point angle refers to the angle formed by the cutting edges at the tip of the drill bit. For drilling stainless steel, a 135-degree split point is highly recommended. This obtuse angle strengthens the cutting tip, reduces cutting forces, and, combined with the split point, provides excellent self-centering capabilities. This prevents the bit from “walking” on the smooth surface of stainless steel, eliminating the need for a pilot hole. A 118-degree point, while common for general-purpose drilling, is less aggressive and more prone to walking on hard materials.
Coatings (TiAlN, TiAlSi, Gold Oxide)
Coatings play a vital role in enhancing a drill bit’s performance and lifespan, especially when dealing with the high heat and friction generated by drilling stainless steel. Titanium Aluminum Nitride (TiAlN) and Titanium Aluminum Silicon (TiAlSi) coatings offer superior hardness, lubricity, and oxidation resistance, allowing the bit to cut more efficiently at higher temperatures and last longer. Gold Oxide (often a black and gold finish) also adds lubricity and creates small pockets to hold coolant, reducing friction and wear, though it doesn’t offer the same extreme hardness as TiAlN or TiAlSi.
Shank Type (Straight, 3-Flat, Hex)
The shank is the part of the drill bit that fits into your drill’s chuck. A straight shank is the most common and works with standard chucks. A 3-flat shank (or sometimes a reduced shank with flats) helps prevent the bit from slipping in the chuck, which is particularly beneficial when drilling tough materials that exert high torque. A hex shank (e.g., 1/4 inch) is designed for quick-change chucks and impact drivers, offering convenience for rapid bit swaps, especially useful in tight spaces or when using multiple bits for a project.
FAQ
What makes a drill bit good for stainless steel?
Can I use regular HSS drill bits on stainless steel?
Do I need to use cutting oil?
What drill speed should I use for stainless steel?
Why are cobalt bits more expensive?
Final Thoughts: The Verdict
For most people, the best drill bit for stainless steel winner is the BOSCH CO14B 14-Piece Assorted Set because its M42 cobalt construction and robust design offer an unbeatable combination of durability, heat resistance, and cutting performance for a wide range of kitchen and home projects. If you want a trusted brand with effortless self-centering, grab the DEWALT Cobalt Alloy Steel Drill Bit Set. And for tackling the absolute hardest materials with precision, nothing beats the YFTOOL 4pcs Carbide Drill Bit Set.
