Chicago-latrobe 50908 Screw Machine Drill Bit Cobalt

Product Description

The CHICAGO-LATROBE 50908 is a screw machine length cobalt drill bit designed for heavy-duty production drilling in cast iron and steel. Built to Series 559 standards, this bit carries an M42 cobalt material grade, which maintains hardness and cutting performance at elevated temperatures generated during high-speed drilling. The 135-degree split point reduces walking and allows the bit to self-center without a pilot hole. Two spiral flutes with web thinning and a parallel web configuration ensure consistent chip evacuation and reduced thrust force. The straight-cylindrical shank fits standard drill chucks without modification. Diameter tolerance is held to +0.0000 to -0.0005 inches for precise, repeatable hole sizing.

The 50908 is suited for screw machine operations, CNC drilling setups, and manual drill press work where short bit length provides rigidity and minimizes deflection. Primary workpiece materials are cast iron and steel, making this bit a standard choice for metalworking shops, maintenance machinists, and tool room applications. The screw machine length format keeps the bit compact for tight-clearance work and multi-spindle setups. Right-hand cut geometry matches conventional drilling direction on standard equipment.

Key Features

• M42 cobalt construction retains hardness under high heat during production drilling
• 135-degree split point self-centers and reduces drill walk on hard materials
• Web-thinned parallel web lowers thrust requirements and improves chip flow
• Screw machine length body provides rigidity and reduces deflection in short-reach applications
• Diameter tolerance of +0.0000 to -0.0005 inches ensures consistent hole sizing
• Right-hand cut with regular spiral flutes for standard clockwise drilling operations

Compatibility

Designed as an OEM-style replacement and standard-use cobalt screw machine drill bit for drilling cast iron and steel in production and general metalworking applications. Manufactured to ISO standards.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with drilling operations and machine tool safety. Secure the straight-cylindrical shank fully in a properly sized drill chuck before operation. Power down and lock out the machine before changing bits. Do not exceed the rated speed range for the workpiece material and bit diameter, and use appropriate cutting fluid to extend tool life when drilling steel.