Chicago-Latrobe 46624 3/8 in Cobalt Jobber Drill Bit

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.