Chicago-latrobe 50820 Screw Machine Drill Bit 23/64 in

Product Description

The CHICAGO-LATROBE 50820 is a screw machine length drill bit designed for high-productivity drilling in cast iron and steel. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention in demanding applications. The 135-degree split point reduces walking and lowers thrust at entry, making it effective for production drilling without a center punch. At 23/64 inch (0.3594 inches) in diameter with an overall length of 3-1/16 inches and a flute length of 1-3/4 inches, the short body length adds rigidity and reduces deflection. This bit is specified to ISO standards and carries a heavy-duty grade rating suitable for repetitive use in metal fabrication and machining environments.

The 50820 is suited for screw machine operations, drill press work, and CNC applications where a stub-length bit reduces runout and improves hole accuracy. Primary workpiece materials include cast iron and steel. The straight-cylindrical shank fits standard drill chucks and collet holders without modification. Machinists, maintenance mechanics, and metalworking tradespeople typically reach for this series when drilling short-depth holes at volume in ferrous metals. The short overall length is specifically advantageous in tight setups or when working close to a fixture or workpiece edge.

Key Features

• M42 cobalt construction for heat resistance and extended tool life in ferrous metals
• 135-degree split point reduces thrust and eliminates walking on entry
• Web-thinned parallel web configuration lowers cutting resistance
• Screw machine (stub) length adds rigidity and reduces deflection
• Right-hand cut with regular spiral flutes for efficient chip evacuation
• Diameter tolerance of +0.0000 to -0.0010 inches for consistent hole sizing

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for screw machine operations, drill presses, and CNC setups requiring a straight-cylindrical shank stub-length bit in the 0.3500 to 0.4000 inch diameter range.

Installation Notes

Install the straight-cylindrical shank into a properly sized drill chuck or collet and verify runout before production use. Power down and lock out the machine before changing bits. Use cutting fluid appropriate for ferrous metals to extend tool life and improve hole finish. Inspect the split point for wear or chipping regularly, especially when drilling abrasive cast iron.