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Extra long 15/64 inch HSS drill bit black oxide finish

Chicago-Latrobe

Chicago-Latrobe Extra Long Drill 15/64" HSS 50731 pneumatic accessory

SKU CH-1FKY-TZVCP

Extra-long HSS drill bit with 15/64 inch diameter, 118-degree notched point and 7 1/2 inch drilling depth for general-purpose machining

  • Product typeDrill Accessories
  • Main materialHAWA
  • Extra reach for deep holes with 7 1/2 in maximum drilling depth
  • 118-degree notched point starts accurately on contact
  • High-speed steel with black oxide resists wear in general-purpose machining
  • 15/64-inch fractional size fits standard chucks and tooling

Extra-Long HSS Drill Bit

The Chicago-Latrobe 50731 is a fractional-inch drill bit sized at 15/64 inch and manufactured from high-speed steel with a black-oxide finish. Its extra-long body provides a maximum drilling depth of 7 1/2 inches, making it suited for reaching deep holes in general-purpose machining tasks. The 118-degree notched point helps start the cut cleanly in a variety of materials.

Practical Limits of the Straight-Shank Interface

The straight shank relies on friction in a standard drill chuck, so torque transmission drops if the jaws are worn or the shank is undersized. At 7 1/2 inches of flute length the bit can deflect under heavy feed pressure, especially when drilling harder alloys, and chip evacuation slows once the flutes fill beyond the chuck opening. The 28-degree helix angle is optimised for general-purpose steel rather than deep-hole specialist work.

How it compares

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

Price $20.99
Cheaper than about 62% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameChicago-Latrobe
Product typeDrill Accessories
Size & build
Main materialHAWA

Questions about this item

Should I choose the 15/64 inch size or a different diameter for my job?

Select the 15/64 inch diameter when the hole must match that exact fractional size; the 118-degree notched point and black oxide finish suit general-purpose machining in steel and cast iron.

What does the 7 1/2 inch maximum drilling depth mean when the bit is in a drill press?

It allows a single pass up to 7 1/2 inches deep in one setup, supported by the 28-degree helix and high-speed steel construction for chip evacuation in deep holes.

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