Chicago-Latrobe
Chicago-Latrobe 46624 3/8 in Cobalt Jobber Drill Bit
Cobalt jobber-length drill bit with a 135-degree split point for accurate starts in hard metals
- TypeDrill Bits
- Cobalt steel resists heat during high-speed drilling
- 135-degree split point starts holes without wandering
- 3/8 inch diameter suits common fastening tasks
- Jobber length provides standard reach and rigidity
- Straw bronze finish identifies cobalt grade instantly
Chicago-Latrobe 46624 3/8 in Cobalt Drill Bit
The Chicago-Latrobe 46624 is a jobber-length drill bit sized at 3/8 inch with a decimal equivalent of .3750. It is built from cobalt steel for hardness and heat resistance in metalworking tasks. The 135-degree split point reduces walking and starts holes cleanly without a centre punch. This bit suits mechanics, fabricators and maintenance crews drilling stainless steel, titanium or high-tensile alloys.
Capacity and headroom in steel and alloys
The cobalt construction holds an edge longer than high-speed steel when drilling tough materials such as stainless steel or Inconel. The jobber length provides standard reach for through-holes in plate, angle and tube. The split point geometry handles hand-held and machine drilling without pilot holes. The bit has no coolant holes, so deep holes in low-conductivity metals will need Peck cycles or external flood coolant to clear chips and control heat.
Thermals noise and power draw in use
Cobalt steel tolerates higher cutting temperatures than conventional bits, delaying temper loss during extended cuts. The straw-bronze surface finish signals the heat-treatment grade and offers some lubricity. With no internal coolant passages, heat escapes through the flutes and the workpiece, so feed pressure and speed must match the material to avoid blueing. The shank fits standard three-jaw chucks and quick-change adapters without slippage.
Highlights
- Cobalt steel resists heat during high-speed drilling
- 135-degree split point starts holes without wandering
- 3/8 inch diameter suits common fastening tasks
- Jobber length provides standard reach and rigidity
- Straw bronze finish identifies cobalt grade instantly
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
Questions about this item
Will the 135-degree split point on this 3/8 in cobalt bit start cleanly in the hardened steel plate I already have clamped?
The 135-degree split point is designed to self-centre and reduce walking on hard materials such as hardened steel, so it should start cleanly without a centre punch.
How can I confirm the bit is cutting true after I chuck it in my drill press?
Run the bit at low speed and watch for wobble; a true-running 3/8 in jobber bit will produce a round hole measuring .3750 in with no audible chatter.
Does the 46624 come in a protective case or is it just the bare bit?
The package contains the single cobalt jobber drill bit only; no case, index or lubricant is included.
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