1/2 Cobalt Drill Bit
- Buy 20 or more $7.01 Save 10%
- Buy 50 or more $6.31 Save 19%
- Buy 100 or more $5.68 Save 27%
1/2 Cobalt Drill Bit
Engineered for high-performance drilling in tough metals, the 1/2" Cobalt Drill Bit provides exceptional heat resistance and durability. Its M35 alloy composition and precision 135° split-point geometry ensure clean, accurate holes in stainless steel, cast iron, and other hardened alloys.
- M35 Steel with 5% Cobalt (Co)
- 135° Split-Point Geometry
- High Heat Resistance (up to 1100°F)
- Application: Stainless Steel & Cast Iron
This industrial-grade 1/2" Cobalt Drill Bit is manufactured from M35 high-speed steel, an alloy containing 5% cobalt for enhanced hardness and extreme heat resistance up to 1100°F. This composition allows the bit to maintain its cutting edge integrity when drilling into abrasive and difficult-to-machine materials. The 135° split-point tip is self-centering, preventing the bit from 'walking' on the workpiece and enabling faster, more precise penetration without the need for a center punch. This geometry is crucial for achieving clean entry and consistent hole quality in demanding industrial applications.
Designed for professionals in metal fabrication, automotive repair, and MRO environments, this cobalt bit excels where standard HSS bits fail. Its robust construction ensures a longer tool life and reliable performance when drilling into stainless steel, hardened steel, cast iron, and titanium. Using the proper drilling speed and lubrication will maximize efficiency and extend the bit’s service life, making it a cost-effective solution for commercial drilling operations. Bobco Metals offers this high-performance drill bit for same-day pickup from our Los Angeles warehouse.
Specifications
- Material: M35 High-Speed Steel (5% Cobalt)
- Standards: Meets or exceeds ANSI/ASME B94.11M standards for twist drills
- Strength/Tensile: High hardness and heat resistance up to 1100°F for drilling hardened materials
- Dimensions: Diameter: 1/2"
- Finish: Bronze Oxide or Gold Oxide (result of heat treatment)
- Certifications: Manufacturer Certificate of Conformance available upon request
Applications
- Metal Fabrication: Drilling holes for bolts, rivets, and assembly in stainless steel frames, plates, and equipment.
- Automotive Repair: Boring out broken exhaust manifold bolts, modifying brackets, and working on hardened engine components.
- MRO (Maintenance, Repair & Operations): Repairing industrial machinery, drilling into hardened steel plates, and on-site maintenance tasks.
- Tool & Die: Precision drilling in tough alloys and tool steels where accuracy and bit longevity are critical.
Target Users
This industrial-grade drill bit is designed for professional fabricators, mechanics, maintenance technicians, and machinists who require a reliable cutting tool for demanding applications involving stainless steel and other hard metals.
Finish Options
Cobalt drill bits typically feature a Gold or Bronze Oxide surface finish. This finish is not a coating but a result of the heat treatment process, which helps reduce friction, improve chip flow, and indicates the high-performance cobalt alloy.
How to Measure
Drill bits are specified by their cutting diameter. This bit has a 1/2 inch diameter shank and cutting head. For optimal performance, ensure your drill chuck can accommodate a 1/2" shank and that the diameter matches your project's hole specification.
Example: 1/2" Cobalt Drill Bit, 135° Split-Point, Quantity: 10.
Order Checklist
- Verify drill bit diameter (e.g., 1/2 inch) and required quantity
- Specify Cobalt (M35) for hard metal drilling
- Confirm target material (e.g., stainless steel, cast iron)
- Standard Bronze/Gold Oxide finish is included
- Request Certificate of Conformance if required
- Confirm same-day pickup or delivery requirements
Quick Facts
- Product
- 1/2 Cobalt Drill Bit
- Material
- M35 High-Speed Steel (5% Cobalt)
- Standards
- ANSI/ASME B94.11M
- Key Properties
- 135° split-point, high heat resistance up to 1100°F, self-centering tip for hard metal drilling.
- Primary Applications
- Stainless Steel, Cast Iron, Hardened Alloys
- Location
- Los Angeles warehouse - Same-day pickup available
Available Sizes
We stock a comprehensive range of industrial-grade cobalt drill bits from fractional sizes (1/16" to 1") to number and letter gauges. This 1/2" size is available for immediate pickup at our Los Angeles hardware warehouse.
Custom sizes and cutting services are available.
Contact for Sizing