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Silver cylindrical twist drill bit with split point tip and black oxide shank, 31/64 inch size

Chicago-Latrobe

Chicago-Latrobe 42631 31/64 in 135 Degree Drill Bit

SKU CH-6HKX-45T47

A 31/64 inch high-speed steel jobber drill bit with a 135-degree split point and TiAlN coating for general-purpose drilling

  • TypeDrill Bits
  • MaterialHAWA
  • 31/64 inch diameter drills large fractional holes
  • 135-degree split point starts accurately without wandering
  • High-speed steel with TiAlN coating resists heat and wear
  • Jobber length suits standard drill chucks and depths
  • Decimal equivalent 0.4844 simplifies precise size matching

Professional drilling applications

This Chicago-Latrobe 42631 drill bit handles professional drilling tasks with a 31/64 inch diameter and 135 degree split point angle. The heavy-duty jobber length design suits industrial and automotive work requiring precise hole placement. High speed steel construction with TiAlN coating provides durability for demanding applications.

Thermal and power characteristics

The TiAlN coating reduces friction and heat buildup during extended drilling operations. Split point geometry minimises wandering and lowers the force required to start holes. Non-coolant through design means standard lubrication practices apply for heat management in normal use.

Coating and geometry benefits

TiAlN surface treatment increases wear resistance compared to uncoated high speed steel bits. The 135 degree split point eliminates the need for centre punching in most materials. Zero coolant holes simplify the tool while maintaining performance for general purpose drilling tasks.

Highlights

  • 31/64 inch diameter drills large fractional holes
  • 135-degree split point starts accurately without wandering
  • High-speed steel with TiAlN coating resists heat and wear
  • Jobber length suits standard drill chucks and depths
  • Decimal equivalent 0.4844 simplifies precise size matching

Specifications

BrandCHICAGO-LATROBE
TypeDrill Bits
MaterialHAWA

Questions about this item

How do I install the 31/64 in drill bit and what step do people get wrong?

Insert the 31/64 in shank fully into the chuck and tighten securely; the common mistake is not seating the split point flush, which causes wobble at 135 degree point angle.

What maintenance or replacement will the 42631 bit need later?

The High Speed Steel with TiAlN coating resists wear; resharpen the 135 degree split point when cutting slows, and replace once the 0.4844 diameter flank wears beyond tolerance.

What limit appears first on the 42631 bit under sustained drilling?

Heat buildup at the 135 degree split point is the first limit; the non-coolant-through design with zero coolant holes means chips pack and temperatures rise faster in deep holes.

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