When working with stainless steel, selecting the right drill bit is crucial for efficiency and longevity. Stainless steel’s hardness and heat retention require bits that can withstand high temperatures and maintain sharpness. Below is a comparison table summarizing some of the best cobalt and high-speed steel (HSS) drill bit sets designed specifically for drilling stainless steel.
| Product | Brand | Material & Features | Sizes Included |
|---|---|---|---|
| BOSCH CO14B 14-Piece Set | BOSCH | Cobalt M42, high heat resistance, 8% cobalt alloy for extended life | Various sizes, 14 pieces |
| toolant Cobalt Drill Bit Set Pro | toolant | TiAlN coated cobalt, bullet point tip, excellent heat resistance | 21-piece, 1/16″ to 1/2″ |
| NordWolf 5-Piece M35 Cobalt Stubby Set | NordWolf | M35 cobalt steel, stubby for tight spaces, 135° split point tip | 5 pieces, SAE sizes |
| ArtyMaster M35 HSS Cobalt Drill Bit Set | ARTYMASTER | M35 HSS with 5% cobalt, 135° split point, versatile for various materials | 13 pieces, 1/16″ to 1/4″ |
| STROTON Cobalt Drill Bit Set 13PCS | STROTON | True 5% cobalt, 68 HRC hardness, heavy-duty for stainless steel | 13 pieces, 1/16″ to 1/4″ |
BOSCH CO14B 14-Piece Cobalt Drill Bit Set
The BOSCH CO14B set features 14 jobber-length drill bits made from Cobalt M42 alloy which includes 8% cobalt, enhancing durability and heat resistance. These bits are designed for stainless steel, titanium, cast iron, and light-gauge metals. Their hardened surface allows for prolonged use without premature dulling, especially with high-temperature drilling conditions commonly encountered when cutting stainless steel.
The bits provide excellent performance with a longer lifespan that is reportedly 10 times the life of standard bits. The three-flat shank design also enables better grip and reduces bit slippage during drilling.
toolant Cobalt Drill Bit Set for Metal and Steel (Pro)
This set provides 21 cobalt drill bits coated with Titanium Aluminum Nitride (TiAlN), which significantly increases surface hardness up to 89 HRC. The bullet point tip design enhances fast penetration through stainless steel and other metals. The coating not only boosts heat resistance but also keeps the bits sharper for longer.
Sized from 1/16″ to 1/2″, this set covers a wide variety of applications, making it suitable for both light and heavy-duty drilling tasks in industrial or workshop settings. Its design focuses on reducing heat buildup which is a common challenge when drilling stainless steel.
NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set
The NordWolf M35 cobalt drill bits are precision ground for accuracy and extra durability. Their stubby length (approx. 1.8 to 2.3 inches) allows drilling in tight or hard-to-reach spaces. The bits feature a 135° split-point tip for fast, self-centering action, reducing walking and ensuring precise hole placement in stainless steel and other hard metals.
All bits have a 1/4-inch hex shank, enabling easy and stable chucking, especially in impact drivers or quick-change chucks. This set is ideal for professional and hobbyist users who need reliable performance in heavy-duty metal drilling conditions.
ArtyMaster 13pcs M35 HSS Cobalt Drill Bits
Manufactured from M35 high-speed steel with 5% cobalt, the ArtyMaster drill bit set offers enhanced heat, wear, and chip resistance. The 135° split point tip design improves cutting efficiency by reducing pressure and deviation, speeding up the drilling process.
The set spans 13 sizes from 1/16″ to 1/4″, perfect for working with stainless steel, cast iron, and various metals. Its twist design facilitates smooth chip removal, preventing clogging and overheating vital in stainless steel applications.
STROTON 13-Piece M35 Cobalt Drill Bit Set
The STROTON drill bit set is made from authentic 5% cobalt steel sourced from proprietary cobalt ore, delivering a hardness rating of 68 HRC. This genuine cobalt content means the bits provide 3 times the heat, wear, and chip resistance compared to ordinary drill bits.
With a split point design and thorough grinding, these bits excel at heavy-duty jobs including drilling stainless steel, steel plate, cast iron, and hardwood. These bits run up to 3 times faster and offer a longer lifespan, making them well-suited for industrial and frequent use.
Buying Guide: Choosing the Best Drill Bit for Stainless Steel
1. Material Composition
Cobalt drill bits (typically M35 or M42) are the best choice for stainless steel due to their exceptional heat resistance and durability. The cobalt content (usually 5-8%) strengthens the steel to prevent premature wear. Titanium-coated bits (like TiAlN) can further improve heat resistance and longevity.
2. Bit Tip Geometry
A 135-degree split point tip helps the bit self-center on hard stainless steel surfaces, reducing walking and improving hole precision. It also requires less pressure to start drilling, which prevents bit breakage and workpiece damage.
3. Drill Bit Length and Shank
Stubby or shorter drill bits are advantageous when access is limited, while standard jobber bits offer versatility for general use. Hex shanks provide better grip and faster bit changes, especially useful with impact drivers or quick-change chucks.
4. Heat Resistance and Coatings
Drilling stainless steel generates a lot of heat. Bits with heat-resistant coatings (TiAlN, black oxide, or uncoated cobalt) reduce friction and maintain sharper edges longer. Cobalt alloy itself provides excellent natural heat resistance.
5. Size Range and Set Composition
Choose a set covering the sizes needed for your projects. Sets with a wide range (from very small to large bits) offer flexibility. Industrial work may demand precision sizes, while DIY tasks might only need common sizes.
6. Application Compatibility
Verify that the drill bits are explicitly rated for stainless steel and other hard metals. Some bits perform better on soft metals or wood but dull quickly on stainless steel. For optimal results, use bits designed for high hardness materials.