Chicago-Latrobe
Chicago-Latrobe 46625 Jobber Length Drill Bit 25/64 in Cobalt Split Point 135°
Cobalt jobber-length drill bit with a 135-degree split point for 25/64 inch holes
- TypeDrill Bits
- MaterialHAWA
- 25/64 in fractional size matches exact hole requirements
- Cobalt steel resists heat for longer edge life
- 135° split point starts on contact without walking
- Jobber length balances reach and rigidity for general use
- Decimal equivalent 0.3906 in simplifies metric conversion
Chicago-Latrobe 46625 Cobalt Drill Bit
This Chicago-Latrobe 46625 drill bit is a jobber length cutting tool made from cobalt steel with a straw bronze finish. It features a 25/64 inch fractional size and a decimal equivalent of .3906 inches. The 135 degree split point design allows for accurate starting without a centre punch. It is intended for professional mechanics and metalworkers drilling hard materials.
Split Point Geometry and Cobalt Material
The 135 degree split point reduces walking and lowers the thrust required to penetrate the workpiece. Cobalt construction provides increased heat resistance and hardness compared to standard high speed steel bits. The jobber length offers a standard flute and overall length ratio suitable for general purpose drilling depths. No coolant holes are present on this tool.
Suited for Hard Metal Drilling Tasks
This bit suits users drilling stainless steel, cast iron or other tough alloys where cobalt heat resistance is beneficial. The fractional 25/64 inch size fits specific fastener or tap drill requirements. Buyers needing coolant through capability or a different point angle should look at alternative designs. Those requiring metric sizes or coated finishes will need other options.
Highlights
- 25/64 in fractional size matches exact hole requirements
- Cobalt steel resists heat for longer edge life
- 135° split point starts on contact without walking
- Jobber length balances reach and rigidity for general use
- Decimal equivalent 0.3906 in simplifies metric conversion
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How often will the 25/64 in cobalt split point need resharpening under heavy use?
Cobalt steel holds an edge longer than standard high-speed steel, so resharpening intervals are extended; a 135° split point can be restored on a bench grinder when cutting performance drops.
What stops a continuous drilling cycle first — heat buildup or chip evacuation?
With no coolant-through holes, heat accumulates faster than chips clear in deep holes; peck drilling and cutting fluid keep the 135° split point from overheating.
Does the straw-bronze finish change temperature or noise during all-day drilling?
The oxide surface reduces galling and runs marginally cooler than bright finish, but spindle speed and feed rate dominate noise and heat levels.
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