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Chicago-Latrobe 50858 cobalt drill bit #3, straw finish, 135° split point

Chicago-Latrobe

Chicago-Latrobe 50858 Screw Machine Drill Bit #3 135° Split Point Cobalt

SKU CH-5ZF3-5Y04K

A #3 size cobalt drill bit with a 135-degree split point for precise starting and hard-material cutting

  • Product typeDrill Bits
  • #3 size for precise hole-making
  • 135-degree split point reduces walking
  • Cobalt construction resists heat and wear
  • Right-hand cutting for standard operation
  • Decimal equivalent .2130 for exact sizing

Chicago-Latrobe 50858 Screw Machine Bit

The Chicago-Latrobe 50858 is a screw machine drill bit made from cobalt steel with a straw finish. It is engineered for production drilling in harder materials such as stainless steel and high-strength alloys where heat resistance is required.

Suited for high-speed production runs

Machinists running screw machines or CNC lathes on tough metals will benefit from the cobalt substrate and split-point geometry. Buyers drilling soft aluminium, mild steel or wood where a standard point is adequate should select a different geometry.

135-degree split-point geometry

The 135-degree split point centres the bit without a pilot hole and reduces walking on hard surfaces. This point angle is the specification that determines whether the bit matches the material and machine rigidity of the application.

How it compares

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

Price $3.99
Cheaper than about 96% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits

Questions about this item

Will the #3 cobalt bit with 135-degree split point track cleanly in a worn chuck on my older drill press?

The 135-degree split point is designed to self-centre and reduce walking, which helps maintain accuracy even when the chuck has some run-out.

How can I confirm the bit is cutting correctly once installed?

Look for short, curled chips and a quiet, steady drilling sound; the split point should engage immediately without excessive pressure.

Does the 50858 come in a protective case or just the bare bit?

The listing describes a single screw-machine drill bit; no case, sleeve or additional accessories are mentioned.

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