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Cobalt jobber drill bit, gold TiN coating, split point tip

Chicago-Latrobe

Chicago-Latrobe 54104 135 Degree Cobalt Jobber Length Drill Bit

SKU CH-Q136-R9P4W

A 135-degree split-point cobalt jobber drill bit with TiN coating for letter-size D holes

  • TypeDrill Bits
  • MaterialHAWA
  • 135° split point starts on contact without walking
  • Cobalt steel with TiN coating resists heat and wear
  • Jobber length gives standard reach for general drilling
  • Size D letter gauge (.2460 decimal) fits precise hole specs
  • Heavy-duty construction handles tough materials in shop use

Chicago-Latrobe 54104 Cobalt Drill Bit

This cobalt jobber length drill bit handles tough materials such as stainless steel and high-strength alloys. The 135 degree split point reduces walking and starts holes cleanly without a centre punch. It suits professional mechanics and serious DIY users who need reliable performance in hard metals. The TiN coating adds surface hardness and helps extend cutting life.

135 Degree Split Point Geometry

The split point design centres the bit instantly on contact, reducing the thrust needed to begin a hole. Jobber length proportions fit standard drill chucks and allow access to typical workpiece depths without special adapters. No coolant holes are present, so external lubrication or peck drilling is required for deep cuts. The .2460 inch diameter matches letter size D for precise hole tolerances.

Heavy-Duty Cobalt Construction

Cobalt alloy steel retains hardness at elevated temperatures generated during sustained drilling in tough alloys. This heat resistance prevents premature dulling when holes are drilled repeatedly or at depth. The TiN coating further reduces friction and wear during long production runs. The bit is not designed for coolant-through operation, limiting its use in high-volume automated cells that require internal lubrication.

Highlights

  • 135° split point starts on contact without walking
  • Cobalt steel with TiN coating resists heat and wear
  • Jobber length gives standard reach for general drilling
  • Size D letter gauge (.2460 decimal) fits precise hole specs
  • Heavy-duty construction handles tough materials in shop use

Specifications

BrandCHICAGO-LATROBE
TypeDrill Bits
MaterialHAWA

Questions about this item

At what point angle does the split-point geometry start to wander under sustained drilling?

The 135-degree split point keeps the bit centred and reduces walking even during extended drilling sessions.

How hot does the cobalt body get during all-day production drilling?

Cobalt steel with TiN coating dissipates heat efficiently so the bit stays cooler and resists wear on long runs.

What chuck size do I need to hold the .2460-inch shank?

A standard 1/4-inch or 6 mm drill chuck will grip the .2460-inch shank securely.

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