M35 Cobalt Countersink Drill Bit 3 Flutes 90° 6.3–40mm HSS

M35 Cobalt Countersink Chamfer Drill Bit – 3 Flutes, 90°, 6.3–40mm

Upgrade your metalworking and woodworking toolkit with this premium M35 Cobalt High Speed Steel Countersink Chamfer Drill Bit. Engineered with a 3-flute design and 90° chamfering angle, it delivers clean, precise countersunk holes and tapered edges in a single pass — perfect for professionals and serious DIYers alike.

Made in Mainland China.

Key Features

• M35 Cobalt Steel Alloy — Superior hardness and heat resistance for cutting through stainless steel, cast iron, aluminum, and hardwoods.
• 3-Flute Design — Reduces cutting resistance, removes chips efficiently, and extends tool life compared to single- or double-flute bits.
• 90° Chamfering Angle — Ideal for deburring, countersinking screw heads, and tapering holes in a wide variety of workpieces.
• One-Piece Precision Molding — High concentricity and a polished finish ensure smooth, vibration-free operation and consistent results.
• Double-Center Process Ground Shank — Round shank with a smooth finish fits securely in standard drill chucks for easy setup.
• Wide Size Range — Available in 9 sizes: 6.3 / 8.3 / 10.4 / 12.4 / 16.5 / 20.5 / 25 / 31 / 40 mm (0.25"–1.57") to handle a variety of hole diameters.
• Versatile Applications — Suitable for small-amount cutting, cone processing, and 90° chamfering in metalworking and woodworking.

Specifications

Package Contents

• 1 × M35 Cobalt Chamfer Countersink Drill Bit

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Frequently Asked Questions

Q: What materials can this M35 cobalt countersink drill bit cut through?

A: Thanks to its M35 cobalt high speed steel construction, this chamfer drill bit is capable of cutting through stainless steel, mild steel, cast iron, aluminum, and hardwoods. The cobalt alloy provides enhanced hardness and heat resistance compared to standard HSS bits, making it well-suited for demanding metalworking applications.

Q: What drill chuck sizes are compatible with this countersink bit?

A: This bit features a standard round shank and is compatible with most common drill chucks. Simply select the size that matches your intended hole diameter — sizes range from 6.3 mm to 40 mm — and secure it firmly in your chuck before use.

Q: Is this countersink bit suitable for woodworking as well as metalworking?

A: Yes. While the M35 cobalt steel alloy is especially effective for metalworking tasks, the 3-flute 90° chamfering design also works well for countersinking screw heads and deburring holes in wood and composite materials, making it a versatile addition to any workshop.

Q: How do I choose the right size countersink drill bit for my project?

A: Choose a countersink size that is slightly larger than the head of the screw or fastener you plan to recess. For example, for a standard M6 screw, a 10.4 mm or 12.4 mm countersink is typically appropriate. Refer to the screw manufacturer's specifications for the exact recommended countersink diameter.

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.