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Cobalt jobber drill bit 19/64 inch 135 degree split point straw bronze finish

Chicago-Latrobe

Chicago-Latrobe 46619 19/64 in 135° Cobalt Jobber Drill Bit

SKU CH-637X-NZ35R

A 19/64 inch cobalt jobber drill bit with a 135 degree split point for heavy-duty drilling

  • Product typeDrill Bits
  • Main materialHAWA
  • 19/64 inch cobalt bit drills hard metals
  • 135° split point starts on contact without walking
  • Jobber length gives reach for deep holes
  • Straw bronze finish resists wear in steel
  • 2969 inch decimal size fits precise specs

Chicago-Latrobe 19/64 in Cobalt Jobber Bit

The Chicago-Latrobe 46619 is a 19/64 inch jobber length drill bit made from HAWA cobalt steel. It is built for machinists and maintenance technicians who need a durable bit for drilling hard metals such as stainless steel and high-strength alloys. The fractional sizing suits imperial specification work where precise hole diameters are required.

135° Split Point Reduces Thrust and Heat

The 135 degree split point geometry centres the bit without a centre punch and lowers the feed pressure needed to start the cut. Reduced thrust cuts friction, so the cobalt substrate runs cooler and holds its edge longer during repetitive drilling. The non-coolant-through design relies on external flood or mist coolant for heat evacuation in deep holes.

Straw Bronze Finish Signals Heat Treatment

The straw bronze surface oxide confirms the final temper and helps identify the bit as cobalt grade in a mixed tool crib. No coatings or surface treatments are applied beyond the oxide layer, so the bit can be resharpened repeatedly without stripping a proprietary layer. The plain shank fits standard three-jaw chucks and collet holders without adapters.

How it compares

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

Price $5.99
Cheaper than about 93% 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

How do I install the 46619 19/64 in cobalt drill bit, and what step do people get wrong?

Chuck the 19/64 in split-point shank securely in a 3-jaw chuck. The step many miss is centre-punching the exact hole location so the 135° point does not walk on hard steel.

What maintenance or replacement will the 46619 19/64 in cobalt bit need later?

Re-sharpen the 135° split point on a dedicated cobalt grinding wheel when cutting slows; no coolant holes exist, so avoid overheating during touch-ups.

What limit appears first on the 46619 19/64 in cobalt bit under sustained drilling?

Heat buildup at the 135° split point — the non-coolant-through design and zero coolant holes mean temperature rises fastest in deep holes.

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