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Cobalt aircraft extension drill bit 7/16 inch 6 inch overall length

Drill America

Drill America Cobalt Aircraft Extension Drill Bit 7/16in 6in

SKU CH-EY7X-QJJ07

A 7/16 inch cobalt steel aircraft extension drill bit with a 6 inch overall length and a heavy-duty split point for hard metals

  • Product typeDrill Accessories
  • 7/16" cobalt steel resists heat and wear
  • 6" overall length reaches deep or awkward holes
  • Heavy-duty split point starts on contact without wandering
  • 4-1/16" flute clears chips efficiently for smoother drilling

Drill America Cobalt Aircraft Extension Bit

This 7/16-inch cobalt steel drill bit has an overall length of six inches and a flute length of 4-1/16 inches. The heavy-duty split point design helps start holes cleanly in tough materials. It is built for extended-reach drilling tasks where standard bits cannot reach.

Suited for deep-hole drilling in metal

Mechanics and fabricators who need to drill through thick steel or aluminium at a distance will find the length and cobalt construction useful. Buyers who need a shorter bit for tight spaces or a different diameter for other fastener sizes should look at other options.

How it compares

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

Price $10.99
Cheaper than about 86% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Product typeDrill Accessories

Questions about this item

How does the 7/16 inch diameter translate when the bit is chucked into a standard drill?

The decimal equivalent is .4375 inches, so the shank fits any three-jaw chuck that accepts up to 1/2 inch capacity.

What does the 6 inch overall length actually limit when drilling deep holes?

With a 4-1/16 inch flute length, the effective drilling depth is roughly four inches before the shank contacts the workpiece.

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