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Silver cylindrical drill bit with gold tip and split point, 135 degree angle, size Q .3320

Chicago-Latrobe

Chicago-Latrobe 41787 135 Degree Jobber Drill Bit Q .3320

SKU CH-ZE41-W1X90

A 135-degree split-point jobber drill bit in high-speed steel with TiN coating, sized Q at .3320 decimal equivalent

  • TypeDrill Bits
  • MaterialHAWA
  • 135-degree split point starts holes cleanly without walking
  • High-speed steel with TiN coating resists wear and heat
  • Jobber length gives standard reach for general drilling
  • Decimal size .3320 inch matches letter Q specification
  • Heavy-duty construction handles tough materials in power tools

Professional drilling tool

The Chicago-Latrobe 41787 is a jobber-length drill bit sized at letter Q with a decimal equivalent of .3320. It is manufactured from high-speed steel and finished with a TiN coating for extended wear resistance. The 135-degree split point reduces walking and improves centring on contact. This accessory suits maintenance technicians and metalworkers who need repeatable hole accuracy in steel and alloy workpieces.

Coating and geometry benefits

The TiN surface treatment lowers friction and heat buildup during prolonged drilling cycles. The split-point geometry eliminates the need for centre punching in most materials, speeding up setup time. Because the bit is non-coolant-through with zero coolant holes, it relies on external lubrication or air cooling when used in deeper holes. These features combine to deliver cleaner cuts and longer edge life in production environments.

Capacity limits and suitable tasks

The .3320 diameter handles medium-sized fastener clearance and tapping operations in ferrous and non-ferrous metals. Jobber length provides standard reach for bench-top and handheld drilling machines without excessive overhang. The bit is not designed for deep-hole drilling beyond its flute length, high-temperature alloys requiring through-coolant tooling, or automated high-feed CNC cycles where coolant-through capability is mandatory.

Highlights

  • 135-degree split point starts holes cleanly without walking
  • High-speed steel with TiN coating resists wear and heat
  • Jobber length gives standard reach for general drilling
  • Decimal size .3320 inch matches letter Q specification
  • Heavy-duty construction handles tough materials in power tools

Specifications

BrandCHICAGO-LATROBE
TypeDrill Bits
MaterialHAWA

Questions about this item

How often will the TiN coating on this 135-degree split-point bit need replacement under heavy use?

The TiN coating wears gradually; replace the bit when the gold colour fades and cutting edges dull, as the coating cannot be reapplied.

What is the first limitation when drilling deep holes with this .3320-inch jobber-length bit?

Chip evacuation becomes the limiting factor because the flute length is fixed by the jobber design and there are no coolant holes.

How much heat builds up in this high-speed-steel bit during continuous drilling?

Expect significant heat at the tip since the 135-degree split point has no internal coolant delivery and the TiN layer only reduces friction slightly.

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