10 Best Drill Bits To Drill Stainless Steel in 2026

Bosch builds these bits from an M42 alloy containing 8% cobalt, a material choice that delivers high heat resistance and a hardened surface for tough metals like stainless steel. That composition means the cutting edge can handle repeated high-temperature sessions without degrading quickly. A thick web-helix design provides extra stability during tough applications, which helps keep the bit from deflecting when you start a hole.

Its 14 jobber-length bits cover a versatile core assortment from 1/16″ to 1/2″, suitable for many common tasks. For drilling in extremely tight spaces, a stubby set like the NordWolf would be more appropriate. If an exhaustive size library is required from the start, the 21-piece Bosch CO21 offers more breadth, though it includes sizes that may see less frequent use.

The Bosch CO21 set uses a no-skate split-point tip for clean, precise holes and accurate starts, which is essential for drilling in hard materials where bit walking can ruin a workpiece. Its cobalt construction is designed for the high temperatures generated when drilling stainless steel, cast iron, and titanium. For bits 3/16 inch and larger, the three-flat shank provides a better grip in the chuck to guard against slipping during use.

The trade-off is the standard jobber length, which won’t fit in every confined space. For extremely tight corners, a stubby set like the NordWolf would be more maneuverable. Compared to the larger 29-piece Milwaukee set, the Bosch offers a more compact, focused assortment that covers the most common sizes without overwhelming a toolbox. Its strength is in its foundational design for accuracy and heat resistance, not in sheer volume or specialized form factors.

With 29 pieces, this Milwaukee set covers a wide range of sizes, which reduces the chance of not having the right bit during a job. The case measures roughly ten by ten inches and the set weighs 2.9 pounds, so it requires more storage space than many other kits. This physical footprint suggests it’s meant for a fixed location rather than a mobile toolkit.

Compared to the Bosch CO21 set, which is under half the weight, the Milwaukee kit’s larger case is less convenient for a compact tool bag. Its dimensions are nearly double the length and width of the Bosch CO14B set’s case. For users who frequently transport their tools, this size difference is a practical consideration.

A Titanium Aluminum Nitride coating handles temperatures up to 1472°F, which drastically reduces heat buildup during tough jobs like drilling stainless steel. The bits are crafted from M35 cobalt high-speed steel for tackling materials with an effective drilling hardness up to 60 HRC. An innovative three-flute geometry provides approximately 40% improved chip ejection for cooler operation and a superior hole finish compared to conventional two-flute bits.

The main trade-off is that the performance-optimized triple-flute design only starts at 3/32″, so the very finest bits in the set are more conventional. That makes sense for structural integrity at that scale, but it’s a detail to note if your work is exclusively with tiny fasteners. For a massive range of general metal drilling where heat management is the primary enemy, this Crosstar set is a standout. If you only need a few common sizes for lighter duty, a more basic cobalt set like the Bosch CO14B might suffice.

This set’s M35 cobalt construction is the key fact, it provides the hardness and heat resistance needed to bite into stainless steel without immediately dulling. For a DIYer or homeowner who only occasionally needs to drill into tough metals, this offers the essential performance at an accessible point. The 13-piece spread covers the most frequent hole sizes, and the self-centering 135-degree point helps you start accurately without a punch, which is a major help on curved or hardened surfaces.

This MACXCOIP set uses classic jobber-length bits with round shanks, which are designed for a standard drill chuck. This makes them a straightforward choice for general metalworking tasks around the shop. The M35 cobalt construction is suitable for cutting materials like stainless steel, iron castings, copper, and aluminum, delivering capable performance in a no-fuss package.

These bits are barely over two inches long, which is the single feature that defines their purpose. That stubby profile lets you get into corners, inside cabinets, or up against a wall where a standard-length drill bit simply won’t fit. For a plumber installing a bracket in a tight vanity or a mechanic adding a fastener in a crowded engine bay, this compact access is the entire reason to choose this set. The M35 cobalt construction and 135-degree split point deliver the bite needed for stainless steel and hard metals, ensuring the short design doesn’t come at the cost of performance.

The trade-off for that compact length is a very limited selection. With just five sizes topping out at 5/16 inch, this isn’t your primary drill bit set. It’s a specialized solution for specific, space-constrained tasks. For a comprehensive workshop set, you’d look to something like the 21-piece Bosch CO21, which offers far greater size range and versatility for general metalworking. The NordWolf set excels in its niche, but you’ll need to pair it with a standard-length set for any job that isn’t fighting for clearance.

A solid-bonded 1/4-inch hex shank designed for higher torque means these bits are built to survive the brutal stop-start action of an impact driver, a tool that typically destroys standard twist drills. The M35 cobalt alloy tackles stainless steel and cast iron, so you can prep materials for fabrication or repair with confidence. According to the manufacturer, the design runs straight and true while eliminating radial runout, which keeps the bit centered during operation.

The trade-off is scope. With sizes stopping at 1/4-inch, you’re covered for thirteen common fractional sizes but not for larger plumbing or electrical conduit holes. For a more comprehensive size range, you’d look at a set like the Bosch CO21. The Sinyeenglon excels in its impact-ready niche, delivering durability where it counts, but it’s not a universal metal-drilling solution.

The TiAlN coating’s ability to handle continuous friction temperatures exceeding 1,472°F is the key here. This extreme heat resistance directly combats the rapid edge dulling that happens when drilling thin, hard stainless steel. Combine that with a self-centering Pilot Point tip, and you have a set engineered to start straight and last significantly longer in the exact scenario where standard bits fail. This makes it the right call for anyone regularly fabricating or repairing sheet metal, where clean holes and bit longevity are non-negotiable.

Tip geometry shifts between sizes in this set, which changes the cutting feel across the range. Bits from 1/16″ to 1/8″ use a standard design, while sizes from 9/64″ up feature a bullet tip. For dedicated sheet metal work on a drill press or standard chuck, the set’s heat management and anti-skating design are central to its performance.

A step bit that drills ten distinct hole sizes from a quarter-inch up to an inch and three-eighths is built for versatility in thin materials, not brute force. The ZELCAN bit is for the electrician or DIYer who needs to make clean, burr-free holes in sheet metal, plastic, or aluminum ductwork without swapping bits. Its titanium-coated high-speed steel and two-flute design manage heat and clear chips effectively, provided you stay within its intended use. This is a tool for making holes in control panels or HVAC work, not for tackling a stainless steel sink.

The manufacturer is very clear: this bit is not for steel. That limitation is its defining trade-off. For stainless steel, you need a dedicated cobalt bit like the Bosch CO21 set, which is formulated for that harder material. The ZELCAN step bit excels at its specific job, creating a range of clean, stepped holes in softer sheet stock quickly. It saves you time and hassle on a service call, but you must keep a separate, proper set for any hardened metal work.

With 99 pieces spanning from 1/16″ to 3/8″, this set eliminates the need to buy individual bits for most stainless steel projects. The M35 cobalt construction, hardened to 67 HRC, is built to handle the abrasion of stainless steel and cast iron without immediately dulling. It’s a logical fit for a workshop that frequently tackles varied metal fabrication or maintenance, where having the exact size on hand saves multiple trips to the store. The comprehensive size range means you’re covered for everything from pilot holes to clearance diameters in a single purchase.

That extensive selection requires a storage case measuring 7.9 inches long and 7.7 inches wide, so it needs a dedicated spot on a shelf. Compared to a more compact 21-piece set like the Bosch CO21, this Sinyeenglon kit offers greater variety at the cost of portability. Its design prioritizes having every size on hand for flexible project work in a fixed location.