Chicago-latrobe 50725 Extra Length Drill Bit 0.2031 in Hss

Product Description

The CHICAGO-LATROBE 50725 is an extra length high speed steel (HSS) drill bit engineered for long reach drilling applications where standard-length bits fall short. At 10 inches overall length with a 7.5-inch flute length, this bit provides extended reach without sacrificing rigidity. The 0.2031-inch diameter pairs with a straight-cylindrical shank of equal diameter for reliable chuck grip. An oxide finish helps reduce friction and resist heat buildup during cutting. The 118-degree notched point and web-thinned, tapered web configuration make starting and chip evacuation more efficient across a range of metalworking tasks. This bit is installed by machinists, maintenance technicians, and metalworking tradespeople.

The 50725 is suited for drilling through cast iron and steel in applications that require extended reach beyond standard jobber-length tooling. Typical use cases include deep-hole drilling in structural steel, equipment frames, and cast components where clearance is limited or the hole depth exceeds what a standard bit can reach. The Series 120X designation places this bit in a defined product family built around general-purpose, long-reach metal drilling. The right-hand spiral flute configuration is compatible with standard drill presses and hand-held drilling equipment.

Key Features

• 0.2031-inch diameter with a diameter tolerance of +0.0000 to -0.0007 inches for consistent hole size
• 10-inch overall length with 7.5-inch spiral flute for extended reach in deep or obstructed drilling locations
• High speed steel construction rated for cast iron and steel workpieces
• 118-degree notched point with web-thinned, tapered web for easier starting and reduced thrust
• Oxide finish reduces friction and extends tool life under normal cutting conditions
• Straight-cylindrical shank fits standard 3-jaw and keyless chucks without adapters

Compatibility

Designed as a general-purpose extra length drill bit for use in cast iron and steel. Fits standard drill chucks accepting a 0.2031-inch straight-cylindrical shank.

Installation Notes

Install this bit in a properly sized drill chuck and verify secure grip before operating. Use appropriate cutting fluid or coolant for steel and cast iron to manage heat and extend tool life. Secure the workpiece firmly before drilling to prevent walking or deflection, which is especially important at extended lengths. Follow applicable shop safety practices and equipment manufacturer guidelines when operating drill presses or hand-held drilling equipment.