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Silver cobalt drill bit, 5/16 inch diameter, cylindrical shank, parabolic flute, pointed tip

ARTU USA INC

ARTU USA INC Cobalt Drill Bit 5/16 In. 1040

SKU CH-KRZ7-92B74

5/16 In. cobalt bit drills hardened steel, tile, concrete and wood without a centre punch, resists heat to 2000 °F and meets ANSI standards

  • TypeDrill Bits
  • MaterialCobalt
  • Drills hardened steel, tile, concrete and wood
  • No centre punch needed — tip prevents walking
  • Cobalt tip resists heat up to 2000 °F
  • Parabolic flute clears waste faster
  • ANSI-standard 118° tip angle for precision

5/16 Inch Cobalt Drill Bit

This 5/16 inch cobalt drill bit is built for tradespeople and serious DIY users who need a single bit that can handle hardened steel, ceramic tile, marble, concrete, glass, masonry, wood and more. The cobalt and tungsten carbide tip resists heat up to 2000 F and stays sharp longer than standard high-speed steel bits.

Check Chuck Capacity and Material Suitability

Verify that your drill chuck accepts a 5/16 inch straight shank before ordering. The bit is designed for rotary or percussion drilling, so confirm your tool supports the required mode for the material you intend to drill. No center punch is needed because the tip geometry prevents walking on hard surfaces.

Heat Resistance and Durability in Use

The cobalt tip tolerates temperatures up to 2000 F, reducing the risk of overheating during extended drilling in metal or masonry. Negative back grinding gives the tip a filing action that cuts efficiently with less force, which helps keep the bit cooler and quieter. The chrome vanadium steel shank adds strength and flexibility, and the bit can be resharpened on a silicon carbide wheel when the edge eventually dulls.

Highlights

  • Drills hardened steel, tile, concrete and wood
  • No centre punch needed — tip prevents walking
  • Cobalt tip resists heat up to 2000 °F
  • Parabolic flute clears waste faster
  • ANSI-standard 118° tip angle for precision

Specifications

TypeDrill Bits
MaterialCobalt

Questions about this item

Does the 5/16-inch cobalt bit come alone or in a set, and do I need a separate center punch?

The bit is sold individually and requires no center punch because the tip eliminates walking on hard surfaces.

Should I choose this 1040 model over other sizes for a specific drilling depth?

This 5/16-inch bit provides a 2-5/8-inch drilling depth; select a different diameter if your hole-depth requirement differs.

What does the 2000-degree heat resistance mean when drilling hardened steel?

The cobalt-tungsten carbide tip withstands temperatures up to 2000 F, allowing sustained cutting in hardened steel without losing hardness.

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