Chicago-Latrobe
Chicago-Latrobe 46790 135 Degree Cobalt Jobber Drill Bit
Cobalt jobber drill bit with a 135-degree split point for hard-metal drilling
- TypeDrill Bits
- MaterialHAWA
- 135-degree split point starts on contact without walking
- Cobalt steel resists heat during heavy-duty drilling
- Jobber length gives standard reach for general use
- Letter size T equals .3580 inch for precise holes
- Straw bronze finish identifies cobalt material at a glance
Chicago-Latrobe 46790 Cobalt Drill Bit
The Chicago-Latrobe 46790 is a jobber length drill bit made from cobalt steel for drilling hard materials. It features a 135 degree split point that starts on contact without wandering. The straw bronze finish identifies the heat-treated cobalt construction. It is supplied as a single bit in letter size T with a decimal equivalent of .3580.
Suited for metalworkers drilling stainless steel
This bit serves machinists and maintenance crews who need a durable cutter for tough metals. The split point reduces thrust required in handheld or press operations. Buyers who need coolant-through capability for deep holes or high-volume production should look elsewhere. The zero coolant holes and non-coolant design limit it to conventional drilling methods.
135 degree split point angle
The 135 degree split point is the specification that decides if this bit matches the application. It provides self-centring action and efficient chip ejection in hard materials. A different point angle would not deliver the same penetration performance in cobalt-hardened workpieces.
Highlights
- 135-degree split point starts on contact without walking
- Cobalt steel resists heat during heavy-duty drilling
- Jobber length gives standard reach for general use
- Letter size T equals .3580 inch for precise holes
- Straw bronze finish identifies cobalt material at a glance
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Will the 135-degree split point on this cobalt jobber bit need re-grinding to stay accurate?
The split-point geometry is designed to self-center and reduce walking, so it maintains its drilling precision longer than conventional points and typically does not require re-grinding under normal use.
What stops me from drilling continuously with the 0.3580-inch diameter?
Heat buildup in the cobalt steel is the first limit; the non-coolant-through design means chips and heat must clear the flutes, so sustained high-speed runs will stall until the bit cools.
How hot and loud does the 46790 get during all-day drilling?
The straw-bronze cobalt surface runs hotter than coated bits because it lacks a thermal barrier, and the open flutes produce a noticeable high-pitched whine at full RPM, though vibration stays low thanks to the split point.
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