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Chicago-Latrobe #4 HSS drill bit 11128 extra long split point 135° 28° black oxide finish

Chicago-Latrobe

Chicago-Latrobe #4 HSS Drill Bit 11128 Extra Long Split Point 135° 28° Black Oxide

SKU CH-E3KV-KA0KM

Extra-long HSS drill bit with 135° split point and black-oxide finish for deep, accurate holes

  • TypeDrill Accessories
  • MaterialHAWA
  • Extra-long reach for deep-hole drilling up to 2 1/2 in
  • 135° split point starts on contact without walking
  • Black oxide finish resists wear and reduces friction
  • High-speed steel grade HAWA handles demanding machining tasks

Chicago-Latrobe #4 HSS Drill Bit 11128

This Chicago-Latrobe drill bit is a high-speed steel accessory designed for precision drilling tasks. It features a 135-degree split point that ensures accurate starts without walking. The black oxide finish provides corrosion resistance and reduces friction during operation. It suits professionals and hobbyists needing reliable performance in metalworking applications.

Extra Long Reach with 28-Degree Helix

This bit replaces shorter drills when deeper holes up to 2 1/2 inches are required in a single pass. Its extra-long design combined with a 28-degree helix angle improves chip evacuation in deep cavities. The upgrade is worth it when standard-length bits cannot reach the target depth or when frequent peck drilling slows workflow. It is not suited for shallow-hole production where a stub-length bit offers greater rigidity.

Highlights

  • Extra-long reach for deep-hole drilling up to 2 1/2 in
  • 135° split point starts on contact without walking
  • Black oxide finish resists wear and reduces friction
  • High-speed steel grade HAWA handles demanding machining tasks

Specifications

BrandChicago-Latrobe
TypeDrill Accessories
MaterialHAWA

Questions about this item

What clearance does the 28° helix angle need for chip evacuation in deep holes?

The 28° helix angle is designed to pull chips upward through the 2 1/2 in maximum drilling depth, so the flutes must stay clear of obstructions along that full length.

How is the 135° split-point tip used to start a hole without a centre punch?

Align the 135° split point at the exact centre, apply steady pressure and start the drill at low speed so the self-centring geometry bites before the flutes engage.

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