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Cobalt drill bit, bronze oxide finish, reduced shank, 59/64 inch

Drill America

Drill America 59/64 in. Reduced Shank Cobalt Silver & Deming Drill Bit

SKU CH-QHS8-P77FB

A 59/64 inch cobalt drill bit with a reduced 1/2 inch shank for large-hole drilling in tough metals

  • Product typeDrill Accessories
  • 59/64 inch drill size creates large-diameter holes
  • 1/2 inch reduced shank fits standard drill chucks
  • Cobalt steel construction resists heat and wear
  • Bronze oxide finish adds corrosion protection

59/64 Inch Reduced Shank Cobalt Drill Bit

This Drill America bit is a Silver and Deming style accessory built from cobalt steel for drilling tough materials. It features a 1/2 inch reduced shank to fit standard drill chucks while providing a larger cutting diameter. The bronze oxide surface treatment on the flutes helps resist wear and corrosion during use.

Bronze Oxide Flutes and Reduced Shank Benefits

The bronze oxide coating on the flutes reduces friction and heat buildup, extending the cutting life of the cobalt steel body. The reduced shank design allows this large diameter bit to be used in drills with standard 1/2 inch chuck capacity. It is not suited for machines that require a full-sized shank or for drilling diameters smaller than 59/64 inch.

How it compares

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

Price $45.99
Pricier than about 65% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Product typeDrill Accessories

Questions about this item

Will the cobalt steel tip need re-sharpening after drilling hardened steel?

Cobalt steel holds an edge longer than high-speed steel, but the cutting lips will eventually dull and can be re-ground on a bench grinder or by a sharpening service.

What limits continuous drilling in stainless steel with this 59/64" bit?

Heat buildup in the flute area is the first limit; the bronze oxide coating helps, but you must use cutting fluid and pause to clear chips every few seconds.

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