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Silver cobalt drill bit with gold tip, jobber length, split point, 135 degree angle

Chicago-Latrobe

Chicago-Latrobe 54124 135 Degree Cobalt Jobber Length Drill Bit .4040

SKU CH-J2KZ-CAHV5

A 135-degree split-point cobalt jobber drill bit in size Y with a .4040 decimal equivalent and TiN coating

  • Product typeDrill Bits
  • Main materialHAWA
  • 135-degree split point starts drilling on contact
  • Cobalt construction with TiN coating resists heat and wear
  • Jobber length suits general-purpose drilling tasks
  • Size Y (.4040) matches precise hole requirements
  • Non-coolant-through design simplifies setup and use

Cobalt Jobber Drill Bit Y .4040

The Chicago-Latrobe 54124 is a jobber length drill bit made from cobalt steel with a TiN coating. It features a 135 degree split point for self-centering and reduced thrust. The decimal equivalent is .4040 inch, corresponding to letter size Y. It is a non-coolant through design with zero coolant holes.

TiN Coating and Split Point Benefits

The titanium nitride coating increases surface hardness and reduces friction during drilling operations. The 135 degree split point geometry allows the bit to start on contact without a centre punch. These features combine to extend tool life and improve accuracy when drilling hard materials such as stainless steel or titanium alloys.

Suited for Hard Metal Drilling

This bit suits machinists and maintenance technicians who regularly drill tough alloys and need a durable, self-centering tool. It is not intended for buyers who require coolant-through capability for deep hole drilling or for those needing a comprehensive drill bit set covering multiple diameters.

How it compares

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

Price $17.99
Cheaper than about 68% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits
Size & build
Main materialHAWA

Questions about this item

Will the split-point tip on this .4040 cobalt bit need re-sharpening after heavy use?

The 135-degree split point can be re-sharpened on a standard bit grinder to restore cutting performance when the edge dulls.

What stops the TiN coating from wearing through during a long production run?

The TiN surface layer resists abrasion until the underlying cobalt substrate is exposed, which marks the practical wear limit.

How hot does the 54124 get when drilling steel continuously all day?

Cobalt alloy and TiN coating reduce heat build-up, but sustained high-speed drilling will still raise the shank temperature noticeably.

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