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Silver cobalt drill bit, 51/64 inch, reduced shank, bronze oxide finish

Drill America

Drill America D/ACO51/64 51/64" pneumatic accessory

SKU CH-Z9PG-YJST6 MPN D/ACO51/64

51/64 inch cobalt drill bit with 1/2 inch reduced shank for drilling large holes in tough metals

  • Product typeDrill Accessories
  • 51/64" cobalt bit drills hard metals
  • Reduced 1/2" shank fits standard chucks
  • Bronze oxide finish resists wear
  • 3" flute length clears chips efficiently

Drill America 51/64" Cobalt Silver and Deming Bit

This new Drill America D/ACO51/64 is a 51/64 inch cobalt steel drill bit with a 1/2 inch reduced shank. It features bronze oxide surface treated flutes for wear resistance. The decimal equivalent is .7969 with a 3 inch flute length and 6 inch overall length.

Best for Large Hole Drilling in Metal

Suited for machinists and maintenance technicians drilling 51/64 inch holes in tough alloys using a 1/2 inch chuck. Not for users needing smaller diameters, larger shank sizes, or bits without reduced shank design.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $35.99
Pricier than about 58% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Model nameD/ACO51/64
Product typeDrill Accessories

Questions about this item

Will this 51/64" drill bit fit my 1/2" drill chuck?

Yes, the reduced shank is sized for a 1/2" chuck so the bit mounts directly without an adapter.

Can I use this cobalt bit in my older pneumatic drill motor?

The 1/2" reduced shank fits standard pneumatic drill chucks, and the cobalt steel construction handles the higher torque of older motors.

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