Best Drills for Metal: Top Cobalt and High‑Speed Bits for Hard Metals
Metal drilling demands tools engineered for heat and wear. This guide highlights five top drill-bit sets built for hard metals, including stainless steel and cast iron. Each option blends cobalt alloys, coatings, and geometry to maximize life and performance for professional shops and DIYers.
| Product | Brand | Key Benefit |
|---|---|---|
| Bosch CO14B 14-Piece Set | Bosch | Durable M42 cobalt bits; up to 10x life |
| DEWALT DWA1184 | Dewalt | 135° split point; versatile HSS for plastic, wood, metal |
| WildBossy M35 Cobalt Set | WildBossy | 5% cobalt; 1/16″ to 1/2″; long life |
| Crosstar M35 Cobalt Set | Crosstar | TiAlN coating; self-centering tip; 21 pieces |
| Bestwork Three-Flute Set | Bestwork | Three-flute design; 135° split point; 21 pieces |
Bosch CO14B 14-Piece Cobalt Drill Bits
Bosch CO14B offers a 14-piece cobalt M42 drill bit set designed for demanding metalwork. The 8% cobalt alloy boosts heat resistance and wear life, enabling drilling through stainless steel, cast iron, titanium, and light-gauge metal with greater reliability. The bits stay sharp longer than standard high-speed steel, reducing tool changes on tough jobs.
Their three-flat shank minimizes slipping in quick-change chucks, delivering consistent torque. The included case keeps all pieces organized for transport and on-site use. With cobalt construction optimized for high heat, this Bosch set suits fabricators, mechanics, and professionals who routinely drill hard metals.
DEWALT DWA1184: 14-Piece Set With 3-Flats Shank
DEWALT DWA1184 is a 14-piece drill bit set with a 3-flat shank and a 135-degree split point. Made from high-speed steel, it’s designed for plastic, wood, and metal, making it versatile for multi-material projects. The 135-degree tip reduces walking and helps start holes accurately, while the tapered web enhances durability under frequent use.
Although not cobalt, this set emphasizes reliability for common fabrication tasks. It’s ideal for workshops, automotive work, and maintenance, offering quick access to sizes for metal drilling as well as other materials. Robust geometry and a general-purpose design make it a practical choice when budget and flexibility matter.
WildBossy M35 Cobalt Drill Bit Set
WildBossy’s 20-piece M35 cobalt set uses a 5% cobalt alloy for hardness and durability. The bits are designed to drill through hardened metals such as stainless steel and cast iron with faster cutting and longer life than standard HSS equivalents. The kit covers sizes from 1/16″ to 1/2″ and ships in a plastic storage case.
Designed for heavy-duty use, the bits feature a 135-degree split point and a three-flat shank that resists slipping in the chuck. The cobalt content and robust coating help reduce heat buildup and improve chip removal, delivering cleaner holes in demanding metalwork applications.
Crosstar M35 Cobalt Drill Bit Set
Crosstar’s M35 cobalt set uses 5% cobalt for reliable performance on hardened metal, stainless steel, and cast iron. The TiAlN coating increases heat resistance and extends life, while the three-flat shank provides a secure grip in the chuck. The self-centering pilot tip minimizes wandering during start-up.
With a 21-piece range from 1/16″ to 1/2″, this kit covers a broad size spectrum for automotive, HVAC, and fabrication work. The TiAlN coating helps maintain cutting efficiency under heavy use, and the overall design emphasizes durability for long-term metalworking projects.
Bestwork Three-Flute Cobalt Drill Bits
Bestwork offers a 21-piece cobalt drill bit set with a three-flute design and a three-flat shank for a secure chuck grip. The bits are made from M35 high-speed steel with 5% cobalt, delivering improved durability and wear resistance for drilling hardened metal, stainless steel, and cast iron.
Starting with a 135-degree split point, these bits resist wandering and maintain accuracy on curved surfaces. A tough coating helps lubricants adhere and reduces wear during heavy drilling tasks. The set is suitable for professional shops and DIY garages tackling tough metal drilling tasks.
Buying Guide
When choosing drill bits for metal, consider cobalt content and alloy type. M42 cobalt bits (about 8% cobalt) offer higher heat resistance and longer life than M35 cobalt bits (about 5%). For frequent drilling in stainless steel or titanium, M42 may be preferred; for general hard metals, M35 is often sufficient.
Coatings such as TiN or TiAlN reduce friction and extend wear life, especially under high heat. TiAlN coatings can extend life by multiple cycles versus uncoated steels in metalworking. The coating choice should align with heat exposure, budget, and the metals drilled most often.
Point geometry matters: a 135-degree split point helps start holes on tough metals without walking, while a pilot point can improve accuracy on curved surfaces. Shank design, such as three-flat or round shanks, affects grip and slip in the chuck.
Practical considerations include the range of hole sizes needed, kit organization, and storage. A larger set may be economical if you regularly drill a wide range of metals. Always follow manufacturer guidance on speeds, feeds, and lubrication to maximize life.