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Silver cobalt drill bit with reduced shank, 55/64 inch size

Drill America

Drill America 55/64" 1/2" Reduced Shank Cobalt Silver & Deming Drill Bit pneumatic accessory

SKU CH-KNRD-Z7NJQ

Cobalt steel drill bit with reduced shank for 55/64 inch holes in hard materials

  • Product typeDrill Accessories
  • 55/64 inch diameter handles large holes in tough metal
  • 1/2 inch reduced shank fits standard drill chucks securely
  • Cobalt steel construction resists heat and wear during heavy use
  • Bronze oxide coating reduces friction for smoother cutting action

55/64" Cobalt Drill Bit for Heavy-Duty Drilling

The Drill America 55/64" cobalt silver and deming drill bit features a 1/2" reduced shank designed for compatibility with larger drill chucks. Its cobalt steel construction provides enhanced heat resistance and durability when boring through hard metals such as stainless steel and cast iron. The bronze oxide finish helps reduce friction and chip welding during operation. This accessory targets professional mechanics and fabricators who need reliable performance in demanding automotive and industrial applications.

0.8594" Decimal Size with 3" Flute Length

The bit offers a 3" flute length and 6" overall length, delivering sufficient reach for deep-hole drilling in thick workpieces. The reduced shank allows use in 1/2" chucks while maintaining the larger cutting diameter, though the shank diameter limits maximum torque transmission compared to full-shank bits. Users requiring diameters larger than 55/64" or shank sizes beyond 1/2" will need separate tooling. The cobalt substrate resists wear in high-temperature cuts but remains brittle under severe impact or misalignment.

How it compares

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

Price $39.99
Pricier than about 61% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Product typeDrill Accessories

Questions about this item

Will the 1/2" reduced shank fit the chuck on my older 1/2" capacity drill press?

Yes, the 1/2" reduced shank is sized for standard 1/2" chucks, so it will seat securely in the older drill press without an adapter.

How can I confirm the cobalt bit is cutting cleanly in tough steel after I start drilling?

You should see steady, straw-coloured chips and a smooth hole wall at the .8594 decimal size; blue chips or chatter mean the speed or feed needs adjustment.

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