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12 inch HSS aircraft extension drill bit size 27 bright finish

Cleveland Golf

Cleveland Golf C13238 #27 12 in HSS aircraft extension drill

SKU CH-Z1KD-0NKCA MPN C13238

A 12-inch HSS aircraft extension drill bit, size #27 with a 135-degree split point for precision drilling

  • Product typeDrill Accessories
  • Main materialHigh speed steel
  • Extended reach with 12 in length for deep drilling
  • Precise starts with 135° split point reducing wander
  • High-speed steel construction resists heat during use
  • Optimised 21° to 34° helix clears chips efficiently
  • Maximum 9/16 in drilling depth suits wire applications

Extension Drill Bit for Aircraft Maintenance

The Cleveland Golf C13238 extension drill is a high speed steel bit sized #27 with an overall length of 12 inches. It is designed for professional technicians and aviation mechanics who need to reach deep or confined fastener locations during assembly or repair work.

Straight Shank Fits Standard Chucks

The plain shank fits directly into any standard drill chuck without adapters or special tooling. The 135 degree split point is self-centering and reduces walking on hard materials, while the bright uncoated finish may require cutting fluid to prevent chip welding during prolonged use.

Verify Reach and Material Compatibility

Confirm that the 12 inch overall length provides the required reach without exceeding the 9/16 inch maximum drilling depth for the intended hole. Ensure the workpiece material falls within the 21 to 34 degree machining range and that the #27 wire gauge diameter matches the fastener specification before ordering.

How it compares

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

Price $11.99
Cheaper than about 84% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCleveland
Model nameC13238
Product typeDrill Accessories
Size & build
Main materialHigh speed steel

Questions about this item

How can I confirm the #27 drill bit is cutting correctly after chucking it in my drill?

The 135-degree split point should start on contact without wandering and produce clean chips in metal when run at the proper speed for high-speed steel.

What ships with the C13238 and what must I supply?

The box contains the 12-inch HSS aircraft extension drill bit only; you provide the drill motor, chuck and cutting fluid.

When should I choose the #27 size over other wire-gauge options?

Choose #27 when the job calls for its specific wire-gauge diameter and the 9/16-inch maximum drilling depth at a 4×D length-to-diameter ratio.

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