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Silver extra long twist drill bit 21/64 inch high speed steel black oxide finish split point 135 degree angle

Chicago-Latrobe

Chicago-Latrobe Extra Long Drill Bit 21/64 in HSS 11019

SKU CH-VF26-A7S1Q

Extra-long 21/64 inch high-speed steel drill bit with 135-degree split point and black oxide finish for deep-hole machining

  • Product typeDrill Accessories
  • Main materialHAWA
  • Extra reach for deep holes with 3 5/16 in drilling depth
  • 135-degree split point starts on contact and reduces wandering
  • High-speed steel with black oxide resists wear in tough materials
  • 28-degree helix clears chips efficiently during long cuts

Extra-long drill bit for deep holes

This Chicago-Latrobe bit is a high-speed steel drill accessory sized at 21/64 inch with a 135-degree split point. The black oxide finish adds wear resistance for general machining tasks. It is designed for users who need to reach further into a workpiece than a standard-length bit allows. The fractional-inch sizing suits imperial measurement workflows.

3 5/16 in maximum drilling depth extends reach

The extra-long flute provides a maximum drilling depth of 3 5/16 in at a 4xD ratio, letting you complete deeper holes in a single pass. A 28-degree helix angle supports chip evacuation in those deeper cuts. The split point geometry reduces walking at the start of the hole. This bit does not suit jobs requiring carbide hardness or metric shank compatibility.

How it compares

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

Price $14.99
Cheaper than about 77% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameChicago-Latrobe
Product typeDrill Accessories
Size & build
Main materialHAWA

Questions about this item

How often will the 135-degree split point need resharpening?

The 135-degree split point on this high-speed steel bit resists walking and reduces thrust; resharpening frequency depends on the material being drilled and the feed pressure applied during use.

What limits continuous drilling depth in a single pass?

The flute length allows a maximum drilling depth of 3 5/16 inches before chips must be cleared, so sustained deep-hole work requires periodic withdrawal to prevent binding and overheating.

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