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Cylindrical cobalt drill bit with gold TiAlN coating and split point tip

Chicago-Latrobe

Chicago-Latrobe 44920 135 Degree Cobalt Jobber Drill Bit

SKU CH-MWV8-GGRB7

A 5/16 inch cobalt jobber drill bit with a 135 degree split point and TiAlN coating for heavy-duty drilling

  • Product typeDrill Bits
  • Main materialHAWA
  • 135-degree split point starts holes without wandering
  • Cobalt steel with TiAlN coating resists heat and wear
  • Jobber length gives standard reach for general drilling
  • 5/16 inch size covers common fractional hole needs
  • Model 44920 identifies the exact bit for reordering

Professional Cobalt Drill Bit

The Chicago-Latrobe 44920 is a jobber-length drill bit made from cobalt steel with a TiAlN coating. It is built for machinists and maintenance technicians who drill into hard metals such as stainless steel or titanium alloys. The 135-degree split point reduces walking and starts holes cleanly without a centre punch.

Coating And Geometry Benefits

The TiAlN surface treatment increases surface hardness and heat resistance compared with uncoated cobalt bits. This allows higher cutting speeds and longer tool life in abrasive materials. The split-point geometry centres the bit instantly and produces thinner chips that evacuate more easily from the flutes.

Fractional Sizing Limits

The bit is manufactured to a 5/16 inch fractional diameter with a decimal equivalent of .3125 inch. It fits only tooling and workpieces designed for that exact size. Builders who need metric diameters, smaller pilot holes or larger clearance bores must select a different bit.

How it compares

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

Price $15.99
Cheaper than about 73% 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 tip on this 135-degree cobalt bit need re-grinding after heavy use?

The split-point design self-centres and reduces walking, so it stays accurate longer; when it finally dulls, a standard bench grinder can restore the 135-degree angle.

What stops me drilling deeper with the 5/16-inch jobber length?

The flute length of a jobber bit sets the maximum hole depth; once chips fill the flutes you must withdraw to clear them.

How hot does the TiAlN coating get during all-day drilling?

TiAlN tolerates higher temperatures than uncoated cobalt, letting the bit run faster and longer before heat softens the edge.

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