10 Best Mechanics Length Drill Bits Cobalt
#1 Best Pick
Bosch CO2131B 1-Piece 1/16 in. x 1-7/8 in. Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum
Brand: Bosch
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- Cobalt M42 drill bit â provides upgraded M42 cobalt jobber-length bits designed for durability, high heat resistance and hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum
- Enhanced M42 alloy material â contains 8% cobalt alloy that delivers 10X life vs. standard bits
- High-heat resistant bits â withstand high-temperature applications for extended periods of time
- Thick web-helix design â provides additional stability in tough applications
- Surface-hardened tip â penetrates tough abrasive materials
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#2 Best Value
Greywolf Cobalt Drill Bit Set, 25 pcs M35 High Speed ââSteel Twist Drill Bits, Metal Drill Bits for Hard Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Box 1.0mm-10.0mm
Brand: greywolf
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- ăConvenient Size Selectionă: This 25 pcs M35 drill bit set includes everything you need to meet all your needs, bringing a user-friendly experience. Set includes: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm,10.5mm,11mm,11.5mm,12mm,12.5mm,13mmďź [1-13mm, in 0.5mm increments].
- ăIndustrial Grade M35ă: High-speed steel drill bit set, these drill bits contain 5% cobalt, which is much harder than the high-speed steel used in similar drill bit sets. Fully ground drill bits with smooth surface, high grinding precision, and sharp edges can reduce friction between the drill bit and the material and reduce the temperature of the drill bit during operation.
- ăEnhanced Precision Designă: Adopts 135° split point tip for faster penetration and less walking. Deep groove twist drill bit design ensures smooth chip evacuation and stable operation, providing accurate results for demanding work.
- ăHigh-speed Steel Cobalt Drill Bitsă: These drill bits are made of cobalt-containing high-speed steel, which has high hardness characteristics, enabling them to easily penetrate tough materials. This drill bit set comes with a box with size indexing to help you organize the drill bits after use and prevent confusion of different sized drill bits
- ăWide Applicationă: M35 cobalt high-speed steel is more suitable for processing tough, high-tensile strength materials. Especially suitable for cutting hardened metals such as stainless steel, cast iron, high-temperature alloys, titanium alloys, hard plastics and wood. This cobalt drill bit set is a must-have for professionals, amateurs and home improvement enthusiasts.
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#3 Budget Pick
MACXCOIP Cobalt Number Size Drill Bit Set, 60Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1-60
Brand: MACXCOIP
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- Various Sizes: 60 sets of number size drill bits from #1 to #60 (0.228"-0.040" or 5.79mm-1.02mm), can meet more needs
- M35 Cobalt Drill Bit: The M35 cobalt drill bit is a durable, sharp and robust drill bit suitable for cutting stainless steel, iron castings, copper, aluminum and other soft metals as well as plastics, wood etc
- Quick and Efficient: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip and twist design for faster cutting, self-centering to prevent walk-off and faster chip and particle removal
- HSS Drill Bit Set: HSS cobalt drill bit set for hardened steel with excellent cutting performance. 13 sets of drill bits for long term use. The inserts are hardened and polished for improved sharpness and precise cutting without wobbling
- Warm Tips: Pay attention to maintaining a vertical angle before opening, so that the drill bit can fall into the corresponding hole as much as possible. If it is found that it cannot be pulled, it may be because the drill bit below is stuck in the protective sponge and needs to be repeated vertically and then gently pulled to prevent the drill bit from breaking
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#4 Top Choice
Greywolf Cobalt Drill Bit Set, 19 pcs M35 High Speed ââSteel Twist Drill Bits, Metal Drill Bits for Hard Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Box 1.0mm-10.0mm
Brand: greywolf
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- ăConvenient Size Selectionă: This 19 pcs M35 drill bit set includes everything you need to meet all your needs, bringing a user-friendly experience. Set includes: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm [1-10mm, in 0.5mm increments].
- ăIndustrial Grade M35ă: High-speed steel drill bit set, these drill bits contain 5% cobalt, which is much harder than the high-speed steel used in similar drill bit sets. Fully ground drill bits with smooth surface, high grinding precision, and sharp edges can reduce friction between the drill bit and the material and reduce the temperature of the drill bit during operation.
- ăEnhanced Precision Designă: Adopts 135° split point tip for faster penetration and less walking. Deep groove twist drill bit design ensures smooth chip evacuation and stable operation, providing accurate results for demanding work.
- ăWide Applicationă: M35 cobalt high-speed steel is more suitable for processing tough, high-tensile strength materials. Especially suitable for cutting hardened metals such as stainless steel, cast iron, high-temperature alloys, titanium alloys, hard plastics and wood. This cobalt drill bit set is a must-have for professionals, amateurs and home improvement enthusiasts.
- ăWide Applicationă: M35 cobalt high-speed steel is more suitable for processing tough, high-tensile strength materials. Especially suitable for cutting hardened metals such as stainless steel, cast iron, high-temperature alloys, titanium alloys, hard plastics and wood. This cobalt drill bit set is a must-have for professionals, amateurs and home improvement enthusiasts.
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#5 Popular Choice
DEWALT DWA1240 Pilot Point Industrial Cobalt Drill Bit Set (14 Piece)
Brand: DEWALT
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- Designed for maximum speed and life
- Pilot point and split tip design
- No bit walking - more user control
- Intended to be used on hard metals
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#6 Top Pick
Hymnorq 9/64 Inch M35 Cobalt Steel Extremely Heat Resistant Jobber Length Twist Drill Bit Set of 10pcs with Straight Shank for Repeated Drilling Projects in Stainless Steel and Iron
Brand: Hymnorq
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- COBALT STEEL - Manufactured from M35 grade cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, with up to twelve times when compared with an average HSS drill bit.
- FOR METALWORKING - Particularly successful in cutting through hard metals(hardness less than HRC38°) such as stainless steel and cast iron, although they can be used for softer materials like copper and aluminium, too. Not for hardened steel / high carbon steel. Try to adjust the RPM when it fails to penetrate.
- PRECISION GROUND - These bits are fully ground so that it's cutting diameter is seriously accurate and the lifespan is prolonged in comparison to non-ground alternatives(roll forged bits). Smooth bit surface allows for nice clean holes.
- 10PC SET - The set includes 10pcs of 9/64â diameter M35 grade cobalt steel twist drill bits, packed in a plastic case for easy storage and carrying.
- 90 DAYS WARRANTY - If you are not fully satisfied for any reason, please contact us for 100% refund or replacement.
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#7 Top Pick
Hymnorq 1/4 Inch Fractional Size M35 Cobalt Steel Twist Drill Bit Set of 10pcs - Jobber Length and Straight Shank - Extremely Heat Resistant - Perfect for Drilling in Stainless Steel and Iron
Brand: Hymnorq
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- Industrial-Grade M35 Cobalt Steel: Made with 5% cobalt-enriched M35 steel, these 1/4" drill bits deliver superior strength, heat resistance, and wear durabilityâideal for drilling stainless steel, cast iron, and other tough metals.
- Dual Twist Flute & Fully Ground Design: Features a fully ground, dual twist flute for smoother drilling, faster chip removal, and greater precisionâreducing friction and extending tool life during heavy-duty use.
- 135° Split Point for Precision Starts: The 135° split point tip ensures accurate starts with minimal walking, making it easier to drill clean, precise holes on hard or curved surfaces..
- Straight Shank with Chamfered End: Designed with a straight shank for a secure fit in standard drill chucks and a chamfered end for smooth bit changes and better grip stability during operation.
- Durable Transparent PP Case: Comes in a tough, transparent plastic case that keeps all 10 drill bits organized, protected, and easily visibleâperfect for professionals and DIYers who value efficiency and tool care.
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#8 Top Pick
Bosch Professional 19pc. HSS-Cobalt ProBox Metal Drill Bit Set (for Stainless Steel, Ă 1-10 mm, Accessories Drill Driver and Drill Stand)
Brand: Bosch
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- Up to a tensile strength of 900 N/MM134
- Material: high-speed steel/Cobalt
- These drill sets are precision ground hss-co and have a two cutter cylindrical two flute drill bit shape and cover 1mm through to 10mm
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#9 Top Pick
Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs)
Brand: STROTON
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- Premium M42 8% Cobalt Steel ,68-70 HRC (Rockwell Hardness Scale) ,Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life.
- 3 Steps Design for Cutting through Stainless Steel,Hard Metals,Aluminum,Plastic.
- This Cobalt Drill Bit is Typically Capable of Running Three to Five Times Faster.Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes.
- The Sufficiently Sharp Bit Edge Can Cut the Metal Material into Long Strips of Iron Chips rather than Slowly Grinding Throng the Material with a Blunt Drill Bit.
- 19Pcs 135 Degree Split Point Drill Bits Includes :1mm(length:3.4cm) 1.5mm 2mm 2.5mm 3mm 3.5mm 4mm 4.5mm 5mm(length:8.5cm) 5.5mm 6mm(length:9cm) 6.5mm 7mm 7.5mm 8mm(length:11.5cm) 8.5mm 9mm 9.5mm 10mm(length:13cm) [DIA 0.5mm Increments] .
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#10 Top Pick
Hymnorq 15-Piece M35 Cobalt Drill Bit Set, Metric 1.5 to 10mm, 5% Cobalt HSS for Drilling Hard Metal Stainless Steel Cast Iron, Fully Ground Jobber Length Bits with 135° Split Point Tough Indexed Case
Brand: Hymnorq
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- TRUE M35 GRADE COBALT STEEL: Manufactured from premium High-Speed Steel containing 5% Cobalt (HSS-Co), these bits are heat-hardened to cut through tough abrasive materials. They offer significantly higher heat resistance and wear durability compared to standard HSS bits, making them the ultimate choice for drilling into stainless steel, cast iron, and titanium alloys.
- PRECISION 135° SPLIT POINT: Equipped with a 135-degree self-centering split point, these bits bite into the material immediately upon contact. This active cutting tip prevents "walking" or wandering across the work surface and eliminates the need for a pre-punch pilot hole, ensuring accurate and clean starts every time.
- FULLY GROUND & EFFICIENT: Unlike roll-forged alternatives, our bits are fully ground for precise dimension accuracy and concentricity. The precision-engineered dual twist flute design ensures rapid chip removal, effectively reducing friction and heat buildup for a smoother, cooler drilling process.
- 15PC METRIC SIZE COVERAGE: This comprehensive metric set includes 15 essential sizes: 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, and 10mm. It is a versatile kit suitable for a wide range of projects in metalworking, automotive repair, and general DIY on wood, plastic, aluminum, and hard metals.
- HEAVY-DUTY INDEXED CASE: The bits are housed in a rugged, impact-resistant ABS plastic case with rubberized corners for extra protection. The case features a folding design with clearly marked size indexes (raised lettering) for easy identification, keeping your tools organized, secure, and ready for transport to any job site.
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