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Extra long HSS drill bit #3 black oxide split point 135 degree 11127

Chicago-Latrobe

Chicago-Latrobe Extra Long Drill Bit #3 HSS 11127 135° Split Point Black Oxide

SKU CH-H5VS-PDBD6

Extra-long HSS drill bit with 135° split point and black oxide finish for deep precision drilling up to 2½ inches

  • TypeDrill Accessories
  • MaterialHAWA
  • Extra reach for deep holes with 2 1/2 in maximum drilling depth
  • 135° split point starts on contact without walking
  • High-speed steel with black oxide resists wear and heat
  • 4×D flute geometry clears chips efficiently at 28° helix angle

Extra Long #3 HSS Drill Bit 11127

This Chicago-Latrobe drill bit is made from high-speed steel with a black oxide finish for corrosion resistance. The 135-degree split point reduces walking and starts holes cleanly without a centre punch. Its extra-long design reaches a maximum drilling depth of two and a half inches. It suits wire-gauge #3 holes in metal and wood.

28-Degree Helix and 4xD Geometry

The 28-degree helix angle improves chip evacuation in deep holes, lowering heat build-up during extended cuts. A 4xD length-to-diameter ratio provides rigidity for accurate drilling without excessive deflection. Builders needing shorter bits or larger diameters will need a different tool. Users requiring cobalt or carbide grades should look elsewhere.

Highlights

  • Extra reach for deep holes with 2 1/2 in maximum drilling depth
  • 135° split point starts on contact without walking
  • High-speed steel with black oxide resists wear and heat
  • 4×D flute geometry clears chips efficiently at 28° helix angle

Specifications

BrandChicago-Latrobe
TypeDrill Accessories
MaterialHAWA

Questions about this item

Will the 135° split point need re-sharpening after extended drilling in high-performance alloys?

The 135° split point on this high-speed steel bit resists dulling in tough materials, but heavy use in machining-grade alloys will eventually require professional re-grinding to restore the original geometry.

At what point does the 28° helix angle limit chip evacuation during deep-hole drilling?

The 28° helix angle is optimised for the 2 1/2 in maximum drilling depth at 4xD; pushing beyond that depth in wire-size holes risks chip packing and reduced cutting efficiency.

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