M35 Cobalt Countersink Drill Bit 3-Flute 90° 6.3–40mm
M35 Cobalt Countersink Drill Bit 3-Flute 90° 6.3–40mm
M35 Cobalt Countersink Drill Bit – 3-Flute 90° Chamfering Cutter
Tackle precise chamfering and tapering with confidence. This M35 Cobalt High Speed Steel Countersink Drill Bit is engineered for metalworking and woodworking professionals who demand accuracy and durability. The 3-flute design removes material efficiently while the one-piece molded construction ensures concentricity on every pass.
Made in Mainland China.
Key Features
- M35 Cobalt Steel Alloy – Superior hardness and heat resistance for cutting through stainless steel, mild steel, and hardwoods with ease.
- 3-Flute Design – Balanced cutting geometry delivers smooth, chatter-free chamfers and extended tool life.
- 90° Chamfer Angle – Ideal for deburring holes, creating countersinks, and tapering workpiece openings to a clean, consistent angle.
- High Concentricity & One-Piece Molding – Precision-ground in a single piece for minimal runout and reliable, repeatable results.
- Double-Center Grinding Process – Polished round shank fits standard drill chucks; smooth finish reduces friction and improves chip evacuation.
- Wide Size Range – Available in 9 sizes: 6.3 / 8.3 / 10.4 / 12.4 / 16.5 / 20.5 / 25 / 31 / 40 mm (approx. 0.25″–1.57″) to suit a wide variety of hole diameters.
Specifications
| Material | M35 Cobalt Steel Alloy (HSS-Co) |
| Shank Type | Round Shank |
| Number of Flutes | 3 |
| Chamfer Angle | 90° |
| Available Sizes | 6.3, 8.3, 10.4, 12.4, 16.5, 20.5, 25, 31, 40 mm |
| Applications | Metal, Stainless Steel, Woodworking |
| Package Contents | 1 × Chamfer Countersink Drill Bit |
Applications
Perfect for deburring drilled holes, creating countersinks for flathead screws, tapering hole openings, and cone processing across a range of materials including mild steel, stainless steel, aluminum, and wood.
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Note: Monitor color calibration may cause slight variation from actual product color. Please allow a ±1 mm measurement tolerance.
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Frequently Asked Questions
Q: What materials can this M35 cobalt countersink drill bit cut through?
A: The M35 Cobalt HSS construction makes this chamfer drill bit suitable for stainless steel, mild steel, aluminum, cast iron, and hardwoods. The cobalt alloy content provides excellent heat resistance for demanding metalworking applications.
Q: What is the chamfer angle of this countersink bit?
A: This countersink drill bit is ground to a precise 90° chamfer angle, making it ideal for creating countersinks for flathead machine screws, deburring drilled holes, and tapering hole openings in metal and wood workpieces.
Q: Does this bit fit a standard drill chuck?
A: Yes. The bit features a standard round shank that is compatible with most handheld power drills, drill presses, and milling machines. Simply select the size that matches your required hole diameter (ranging from 6.3 mm to 40 mm).
Q: How many pieces are included in the package?
A: Each order includes 1 (one) Chamfer Countersink Drill Bit in your chosen size. If you need multiple sizes, please add each size separately to your cart.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.