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Silver metal twist drill bit, twelve inches long, half inch diameter

Drill America

Drill America 1/2in x 12in HSS Aircraft Extension Drill Bit pneumatic accessory

SKU CH-1T6P-4Z22G

1/2-inch HSS aircraft extension drill bit reaches 12 inches overall length with 4-1/2-inch flute for deep-hole drilling

  • Product typeDrill Accessories
  • 12-inch reach for deep-hole drilling
  • High-speed steel construction resists wear
  • 5000-inch diameter matches 1/2-inch chucks
  • 4-1/2-inch flute clears chips efficiently

1/2in HSS Aircraft Extension Drill Bit

The Drill America 1/2in x 12in HSS Aircraft Extension Drill Bit is a high-speed steel accessory designed for deep-hole drilling in metal fabrication and maintenance tasks. Its 12-inch overall length and 4-1/2-inch flute length suit operators who need extended reach in confined workspaces. The surface-treated finish supports durability during repetitive use.

Installation and common issues

The straight shank fits standard 1/2in drill chucks without adapters, allowing quick changeover on pneumatic or electric drills. Users should verify chuck capacity matches the 1/2in shank to avoid slippage under load. The long flute can collect chips in deep cuts, so periodic withdrawal helps prevent binding and overheating.

How it compares

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

Price $15.99
Cheaper than about 73% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Product typeDrill Accessories

Questions about this item

How can I confirm the drill bit is cutting correctly after I chuck it into my drill?

The bit should produce a clean, round hole at the .5000 decimal size with steady chip evacuation through the 4-1/2 inch flutes; any wobble or rough edges indicate run-out or dullness.

What comes with the drill bit and do I need to purchase a chuck or pilot drill separately?

The package contains only the 1/2 inch by 12 inch HSS aircraft extension drill bit; a compatible 1/2 inch capacity drill chuck is required and is not included.

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