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12-inch bright HSS aircraft extension drill bit, 1/2-inch diameter

Cleveland Golf

Cleveland Golf C13204 1/2x12 In HSS Aircraft Extension Drill

SKU CH-NFRA-TJN6Z MPN C13204

A 12-inch high-speed steel aircraft extension drill with a 135-degree split point for deep-hole drilling

  • Product typeDrill Accessories
  • Main materialHigh speed steel
  • 12-inch reach for deep-hole access
  • 135-degree split point starts on contact
  • High-speed steel withstands heavy drilling
  • 21–34° helix clears chips efficiently
  • Bright uncoated finish resists galling

12 Inch HSS Aircraft Extension Drill

This 12 inch high speed steel extension drill is built for deep hole drilling in metal. The 135 degree split point reduces walking and starts the cut quickly. Bright uncoated finish suits general purpose machining. Designed for machinists and maintenance technicians who need extended reach.

Users needing reach beyond standard jobber length

Suits operators drilling deep holes where standard bits cannot reach. The 12 inch overall length and 2 inch maximum drilling depth cover deep access tasks. Not for buyers who need a coated bit for high volume production or abrasive materials. Not for users who require a shorter, more rigid drill for precision work.

1/2 Inch Diameter With 135 Degree Split Point

The half inch fractional size and 135 degree split point determine hole size and starting accuracy. Point angle falls between 21 and 34 degrees for efficient chip evacuation. High speed steel construction handles general steel and alloy drilling. Verify the shank fits your chuck or collet before purchase.

How it compares

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

Price $31.99
Typical for this category: the median of 5,493 items is $27.99.

Specifications

Product
Brand nameCleveland
Model nameC13204
Product typeDrill Accessories
Size & build
Main materialHigh speed steel

Questions about this item

Will the 1/2-inch high-speed steel tip need re-sharpening or replacement after repeated drilling?

The 135-degree split point on the high-speed steel bit can be re-sharpened multiple times; replacement is only needed once the flutes wear past the 2-inch maximum drilling depth.

What stops me from drilling deeper than the rated depth in one go?

The 2-inch maximum drilling depth and 4xD design limit each plunge; chips must be cleared before continuing.

How hot does the bright uncoated shank get during a full day of drilling?

The uncoated high-speed steel conducts heat quickly, so the shank becomes hot to the touch during sustained use; allow cooling breaks.

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