Chicago-Latrobe
Chicago-Latrobe 50858 Screw Machine Drill Bit #3 135° Split Point Cobalt
A #3 size cobalt drill bit with a 135-degree split point for precise starting and hard-material cutting
- 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.
Highlights
- #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
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill 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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