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Extra-long 3/8 inch black oxide drill bit with 118-degree notched point

Chicago-Latrobe

Chicago-Latrobe 50527 118 Degree Heavy-Duty Extra Long Drill Bit

SKU CH-FTZZ-FQM9J

Extra-long 3/8 inch high-speed steel drill bit with 118-degree notched point and black oxide finish for deep general-purpose machining

  • Extra-long reach with 5 1/2 in drilling depth
  • 118-degree point angle for general-purpose machining
  • High-speed steel construction with black oxide finish
  • Notched point design for improved chip clearance
  • 28-degree helix angle for efficient material removal

Extra Long 3/8 Inch Drill Bit

The Chicago-Latrobe 50527 is a heavy-duty drill bit designed for general-purpose machining tasks that require extended reach. Its extra-long body allows a maximum drilling depth of 5 1/2 inches, making it suitable for deep-hole applications in metal and wood.

Notched Point and Black Oxide Finish

The 118-degree notched point geometry improves self-centering and reduces walking on the workpiece surface. A black oxide coating adds corrosion resistance and helps retain cutting lubricant during operation for smoother chip evacuation.

28-Degree Helix Angle Constraint

The 28-degree helix angle is optimised for general-purpose material removal rather than specialised high-speed or hard-metal drilling. Users needing faster chip clearance in deep aluminium or aggressive feeds in stainless steel may find the standard geometry less effective.

How it compares

Measured against everything we stock in Power Drills, Drivers & Cutting Bits, at today’s prices. Recalculated every night.

Price $18.99
Cheaper than about 84% of the 2,412 comparable items (median $81.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

Will the 118-degree point need regrinding after heavy use?

The 118-degree point can be resharpened on a bench grinder or drill doctor when it dulls, extending the bit's service life.

What stops me from drilling deeper than the 5 1/2 inch flute length?

The flute length limits chip clearance; drilling past 5 1/2 inches packs chips and binds the bit.

Does the black-oxide finish cut heat during all-day drilling?

Black oxide reduces friction and helps dissipate heat, but sustained high-speed work still requires cutting fluid and periodic withdrawal.

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