Chicago-Latrobe 50829 Screw Machine Drill Bit Cobalt 135° Split Point 1/2 in

Chicago-Latrobe 50829 cobalt drill bit

The Chicago-Latrobe 50829 is a screw machine drill bit made from HSS-CO 8% (M42) cobalt steel. It measures 1/2 in with a decimal equivalent of .5000 and features a 135 degree split point. The straw bronze finish identifies the material. It is designed for right-hand cutting in non-coolant-through applications. Machinists and maintenance technicians use it for precise drilling in tough alloys.

1/2 in capacity with 135 degree split point

The 1/2 in diameter provides a .5000 decimal equivalent hole size suitable for standard fastener clearance. The 135 degree split point reduces walking and lowers thrust requirements when starting a cut. Cobalt construction maintains hardness at elevated temperatures generated in stainless steel or high-strength steels. The bit runs out when hole depths exceed the screw machine length flute capacity or when coolant-through delivery is required.

Straw bronze finish and split point geometry

The straw bronze surface indicates the cobalt heat treatment without adding a coating that could mask wear. The split point geometry changes the chisel edge to two cutting lips, which improves centring on curved or angled surfaces. Right-hand cutting direction matches conventional drill presses and portable drills. Non-coolant-through design limits use to external flood cooling or dry drilling only.