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Silver cylindrical twist drill bit with split point tip and fluted shaft

Chicago-Latrobe

Chicago-Latrobe 43780 135 Degree Jobber Length Drill Bit

SKU CH-J5B0-97Q8J

A 135-degree split-point jobber drill bit in high-speed steel with TiCN coating for letter size J (.2770)

  • TypeDrill Bits
  • MaterialHAWA
  • 135-degree split point starts drilling on contact
  • TiCN coating on high-speed steel extends cutting life
  • Jobber length suits general-purpose drilling tasks
  • Letter size J equals 0.2770 inch diameter
  • Heavy-duty construction handles tough materials cleanly

Chicago-Latrobe 43780 Jobber Drill Bit

The Chicago-Latrobe 43780 is a jobber length drill bit designed for general-purpose drilling tasks. It features a 135 degree split point that helps reduce walking and ensures accurate hole starts. The bit is constructed from High Speed Steel with a TiCN coating for increased hardness and wear resistance. It suits professionals and DIY users needing reliable performance in metal, wood, or plastic.

Size J Capacity and Drilling Headroom

This bit has a decimal equivalent of .2770 inches, corresponding to a letter size J, providing a specific diameter for precise hole requirements. The 135 degree point angle and split point design comfortably handle drilling in harder materials like stainless steel and alloy steels where standard points might wander. It runs out when a coolant-through capability is required for deep-hole drilling or high-volume production, as this bit is non-coolant through with zero coolant holes.

Build Fit: Shank and Coating Requirements

The jobber length shank fits standard drill chucks and quick-change systems without needing specialised holders or adapters. The TiCN coating frees up cutting speed potential and extends tool life compared to uncoated or oxide finishes, reducing the frequency of bit changes during a job. It requires a rigid setup to prevent deflection due to its length and lacks internal coolant channels, so external flood or mist cooling must be arranged by the operator for demanding applications.

Highlights

  • 135-degree split point starts drilling on contact
  • TiCN coating on high-speed steel extends cutting life
  • Jobber length suits general-purpose drilling tasks
  • Letter size J equals 0.2770 inch diameter
  • Heavy-duty construction handles tough materials cleanly

Specifications

BrandCHICAGO-LATROBE
TypeDrill Bits
MaterialHAWA

Questions about this item

Will the 135-degree split point on the 43780 bit start cleanly in a hole previously drilled with a standard point angle?

The 135-degree split point is designed for self-centering and reduced walking, which helps it engage accurately even when following an existing hole.

How can I verify the 43780 bit is cutting correctly after installing it in my drill chuck?

A properly cutting bit produces consistent, well-formed chips and drills a hole measuring 0.2770 inches in diameter without excessive heat or vibration.

Does the 43780 bit come with a protective case or any accessories, or is it sold individually?

The bit is supplied as a single unit; no case, sleeve or additional accessories are included in the package.

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