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Silver cylindrical 21/64 inch HSS aircraft extension drill bit six inches long

Drill America

Drill America 21/64 in 6 in HSS Aircraft Extension Drill Bit pneumatic accessory

SKU CH-G2CR-MR6QW

A 21/64 inch high-speed steel aircraft extension drill bit with a 6 inch overall length for deep-hole drilling

  • Product typeDrill Accessories
  • Precise 21/64 inch diameter for accurate holes
  • 6 inch overall length reaches deep work areas
  • High-speed steel construction resists heat and wear
  • 3-5/16 inch flute length clears chips efficiently

Drill America 21/64in Aircraft Extension Bit

This 21/64in HSS aircraft extension drill bit from Drill America is built for deep-hole drilling in metal and wood. Its 6in overall length and 3-5/16in flute length reach areas standard bits cannot. The high-speed steel construction handles repetitive use in maintenance and fabrication shops. It suits mechanics and machinists who need accurate, extended reach.

Fits standard chucks for extended reach drilling

The straight shank fits standard drill chucks without special adapters. The 6in overall length frees up access in deep cavities or through thick workpieces where shorter bits bottom out. The 3-5/16in flute clears chips efficiently over the longer travel. It is not for buyers who need larger diameters or shorter bits for tight spaces.

How it compares

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

Price $8.99
Cheaper than about 90% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Product typeDrill Accessories

Questions about this item

How deep can the 21/64 inch bit drill before the 3-5/16 inch flute length limits chip clearance?

The flute length is 3-5/16 inches, so effective drilling depth is limited to that distance before chips pack the flutes and stall the bit.

Does the high-speed steel hold up to heat during extended pneumatic drilling sessions?

High-speed steel resists heat buildup well, but continuous pneumatic use will still warm the bit; allow cooling breaks to maintain hardness and edge life.

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