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Silver cylindrical drill bit with split point tip and TiAlN coating

Chicago-Latrobe

Chicago-Latrobe 42791 135 Degree Heavy-Duty Jobber Length Drill Bit

SKU CH-CGDR-PRTYN

A 135-degree split-point drill bit in high-speed steel with TiAlN coating for heavy-duty jobber-length drilling

  • Product typeDrill Bits
  • Main materialHAWA
  • 135-degree split point reduces walking on hard materials
  • High-speed steel with TiAlN coating resists wear in steel
  • Jobber length gives standard reach for general drilling
  • Decimal size .3680 matches letter U for precise fits
  • Heavy-duty construction handles repetitive shop use

Chicago-Latrobe 42791 Heavy-Duty Drill Bit

This Chicago-Latrobe 42791 is a jobber length drill bit made from high speed steel with a TiAlN coating. It is designed for general purpose drilling tasks in a workshop or maintenance setting where a durable, coated bit is required.

Suited for metalworkers needing a split point bit

The split point geometry aids self-centring at the start of the hole. Buyers who need a coolant-through design for deep hole drilling or a different point angle for specialised materials should look at other options.

135 degree point angle and .3680 inch size

The 135 degree point angle combined with the .3680 inch diameter (letter size U) determines the cutting action and hole size. Verify these two figures match the requirements of the specific application before purchasing.

How it compares

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

Price $12.99
Cheaper than about 82% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits
Size & build
Main materialHAWA

Questions about this item

Will the split point on this 135-degree drill bit need re-grinding after heavy use?

The split point geometry is ground into the high-speed steel body and can be resharpened on a standard drill sharpener when the cutting edges dull.

What temperature limit appears first during continuous drilling with the TiAlN coating?

The TiAlN coating is rated to withstand higher heat than uncoated HSS, so the base steel temper becomes the limiting factor before the coating degrades.

How hot does the shank get when running this jobber-length bit all day in steel?

Heat builds along the flute length; the shank stays cooler than the tip but will become too hot to touch without gloves during sustained high-speed drilling.

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