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Silver and Deming HSS drill bit, 1/2 reduced shank with three flats

Drill America

Drill America 7/8in HSS 1/2 Reduced Shank Silver and Deming Drill Bit with 3-Flatted Shanks

SKU CH-309F-DRKQE

A 7/8 inch high-speed steel Silver and Deming drill bit with a reduced 1/2 inch shank featuring three flats for secure chuck grip

  • Product typeDrill Accessories
  • 7/8 inch drilling capacity from HSS construction
  • 1/2 inch reduced shank fits standard chucks
  • Three-flatted shank prevents bit slippage
  • Silver and Deming design for general-purpose use

7/8 inch HSS Silver and Deming Drill Bit

This 7/8 inch high-speed steel drill bit features a reduced 1/2 inch shank with three flats for secure chuck grip. The silver and deming style suits general-purpose drilling in metal, wood and plastic where a large hole is needed but the drill chuck capacity is limited.

Practical limits of the reduced shank design

The 1/2 inch reduced shank allows use in standard 1/2 inch chucks, yet the narrower neck concentrates torque and can snap if the bit binds or is forced. The 3-flatted shank resists slipping, but the bit is not suited for deep-hole production runs or high-feed CNC cycles where a solid-shank tool would be required.

How it compares

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

Price $16.99
Cheaper than about 70% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Product typeDrill Accessories

Questions about this item

Which shank style should I choose for a 1/2" chuck?

The 1/2" reduced shank with three flats fits a standard 1/2" drill chuck and the flats prevent the bit from slipping under load.

What does the .8750 decimal equivalent mean when I start drilling?

It confirms the cutting diameter is exactly 7/8 inch, so the hole you drill will match that size in metal, wood or plastic.

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