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Chicago-Latrobe 55478 Silver & Deming drill bit, black oxide finish, 118 degree point

Chicago-Latrobe

Chicago-Latrobe 55478 118° Silver & Deming Drill 1/2 Reduced Shank

SKU CH-9M9F-RXA7Q

A 118-degree high-speed steel drill bit with a 1/2 reduced shank for heavy-duty drilling

  • Product typeDrill Bits
  • 1/2 reduced shank fits standard chucks
  • 118° point angle centres quickly in metal
  • High-speed steel body resists wear
  • Black oxide finish reduces friction
  • 1 7/32 in diameter for large-hole drilling

Chicago-Latrobe 55478 Silver & Deming Drill

The Chicago-Latrobe 55478 is a Silver & Deming drill bit built with a 1/2 inch reduced shank. It fits standard drill chucks while providing a larger 1 7/32 inch cutting diameter. The 118 degree point angle suits general-purpose drilling in metal and other machinable materials.

Machining High Speed Steel with Black Oxide finish

The bit is manufactured from machining high speed steel and finished with a black oxide coating. This combination resists heat buildup during normal drilling operations and reduces friction for smoother cutting. The material choice supports consistent performance and extended tool life in workshop use.

Reduced shank design for broad chuck compatibility

The 1/2 inch reduced shank allows the large-diameter bit to be secured in common drill chucks without requiring a specialised holder. This simplifies setup for machinists and maintenance technicians. The straight shank provides reliable grip and concentricity during drilling tasks.

How it compares

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

Price $74.99
Pricier than about 77% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits

Questions about this item

How is the 1/2 reduced shank secured in a drill chuck, and what step is often missed?

Tighten the chuck evenly on the reduced shank so the bit runs true; the step often missed is checking for wobble before applying full pressure.

What maintenance will the high-speed steel bit with black oxide finish need later?

Resharpen the 118-degree point when cutting slows, and wipe off chips to keep the oxide coating from loading up.

What limit appears first when drilling 1 7/32 in holes continuously in steel?

Heat buildup at the cutting edges dulls the 118-degree point fastest, so pause to let the bit cool.

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