Chicago-Latrobe
Chicago-Latrobe 44920 135 Degree Cobalt Jobber Drill Bit
A 5/16 inch cobalt jobber drill bit with a 135 degree split point and TiAlN coating for heavy-duty drilling
- TypeDrill Bits
- MaterialHAWA
- 135-degree split point starts holes without wandering
- Cobalt steel with TiAlN coating resists heat and wear
- Jobber length gives standard reach for general drilling
- 5/16 inch size covers common fractional hole needs
- Model 44920 identifies the exact bit for reordering
Professional Cobalt Drill Bit
The Chicago-Latrobe 44920 is a jobber-length drill bit made from cobalt steel with a TiAlN coating. It is built for machinists and maintenance technicians who drill into hard metals such as stainless steel or titanium alloys. The 135-degree split point reduces walking and starts holes cleanly without a centre punch.
Coating And Geometry Benefits
The TiAlN surface treatment increases surface hardness and heat resistance compared with uncoated cobalt bits. This allows higher cutting speeds and longer tool life in abrasive materials. The split-point geometry centres the bit instantly and produces thinner chips that evacuate more easily from the flutes.
Fractional Sizing Limits
The bit is manufactured to a 5/16 inch fractional diameter with a decimal equivalent of .3125 inch. It fits only tooling and workpieces designed for that exact size. Builders who need metric diameters, smaller pilot holes or larger clearance bores must select a different bit.
Highlights
- 135-degree split point starts holes without wandering
- Cobalt steel with TiAlN coating resists heat and wear
- Jobber length gives standard reach for general drilling
- 5/16 inch size covers common fractional hole needs
- Model 44920 identifies the exact bit for reordering
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Will the split-point tip on this 135-degree cobalt bit need re-grinding after heavy use?
The split-point design self-centres and reduces walking, so it stays accurate longer; when it finally dulls, a standard bench grinder can restore the 135-degree angle.
What stops me drilling deeper with the 5/16-inch jobber length?
The flute length of a jobber bit sets the maximum hole depth; once chips fill the flutes you must withdraw to clear them.
How hot does the TiAlN coating get during all-day drilling?
TiAlN tolerates higher temperatures than uncoated cobalt, letting the bit run faster and longer before heat softens the edge.
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