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Silver 55/64 inch HSS drill bit with reduced shank and three flats

Drill America

Drill America 55/64in HSS Reduced Shank Drill Bit

SKU CH-8V7S-519SJ

High-speed steel drill bit with a reduced 1/2-inch shank and three-flatted grip for 55/64-inch holes

  • Product typeDrill Accessories
  • 55/64 inch drill size handles large holes efficiently
  • High-speed steel construction resists heat during extended drilling
  • 1/2 inch reduced shank fits standard drill chucks securely
  • Three-flatted shank design prevents slippage under high torque

55/64in HSS Reduced Shank Drill Bit

This 55/64in high-speed steel drill bit features a reduced shank with three flatted surfaces for secure chuck grip. The Silver and Deming style bit has a flute length of 3in and an overall length of 6in. It is designed for general-purpose drilling in metal, wood and plastic where a 1/2in chuck capacity is the limit.

Upgrading from smaller shank bits

The reduced shank allows this large 55/64in diameter bit to be used in a standard 1/2in drill chuck, replacing the need for a larger machine. The jump is worth it when a single hole of this specific decimal size .8594 is required and the workpiece material suits high-speed steel.

How it compares

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

Price $17.99
Cheaper than about 68% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Product typeDrill Accessories

Questions about this item

Will the 1/2 reduced shank fit my drill chuck?

The 1/2 reduced shank fits any chuck that accepts a 1/2 diameter shank, while the 55/64 cutting diameter handles the larger hole.

What is the correct way to tighten the three-flatted shank?

Align each flat with a chuck jaw and tighten evenly so all three flats seat fully; skipping one flat lets the bit slip under load.

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