Chicago-Latrobe
Chicago-Latrobe 46487 135 Degree Cobalt Jobber Drill Bit 9.5 mm
A 9.5 mm cobalt jobber drill bit with a 135 degree split point for heavy-duty drilling
- TypeDrill Bits
- MaterialHAWA
- Cobalt construction resists heat during heavy drilling
- 135-degree split point starts holes without wandering
- 5 mm metric diameter fits standard chucks
- Jobber length provides reach for deep holes
- Straw bronze finish indicates proper heat treatment
135-degree cobalt jobber bit
The Chicago-Latrobe 46487 is a 9.5 mm jobber-length drill bit made from cobalt steel with a 135-degree split point. It suits metalworkers and maintenance technicians who need a durable bit for drilling hard materials such as stainless steel or high-strength alloys. The straw-bronze finish identifies the cobalt construction.
Split-point geometry reduces thrust
The 135-degree split point is designed to start on contact and lower the feed pressure required during normal drilling. Cobalt material maintains hardness at elevated temperatures generated in routine use, helping the cutting edges stay sharp longer than standard high-speed steel bits. No coolant holes are present, so external lubrication is recommended.
Consistent performance in deep holes
Jobber-length proportions give the reach needed for through-holes and deeper drilling without frequent tool changes. Under sustained load the cobalt substrate resists softening, allowing the bit to hold size and finish across multiple holes in tough metals. The split point continues to self-centre even as the flutes clear heavy chips.
Highlights
- Cobalt construction resists heat during heavy drilling
- 135-degree split point starts holes without wandering
- 5 mm metric diameter fits standard chucks
- Jobber length provides reach for deep holes
- Straw bronze finish indicates proper heat treatment
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How do I install the Chicago-Latrobe 46487 9.5 mm cobalt jobber bit in my drill chuck, and what step is often missed?
Open the chuck jaws wide enough for the 9.5 mm shank, insert the bit fully so the shank seats past the jaws, then tighten securely; the step often missed is checking that the split point runs true before drilling.
What maintenance or replacement will the 46487 bit need after extended use?
The cobalt material resists heat, but the 135 degree split point will dull over time; plan to resharpen or replace the bit once the cutting edges no longer produce clean chips in steel.
What limit appears first when the 46487 bit is used continuously in hard metal?
Heat buildup at the 135 degree split point is the first limit; without coolant holes the bit relies on its cobalt alloy to dissipate heat, so pause to let it cool when the straw bronze surface darkens.
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