Chicago-latrobe 50745 Extra Length Drill Bit 0.3906 in Hss

Product Description

The CHICAGO-LATROBE 50745 is an extra length high speed steel drill bit engineered for long reach drilling applications where standard-length bits cannot access the work zone. Built from high speed steel with an oxide finish, this bit measures 12 inches in overall length with a 9-inch spiral flute and a 0.3906-inch diameter. The 118-degree notched point with web thinning and a tapered web configuration reduces thrust and improves chip evacuation at the cut. The straight-cylindrical shank measures 0.3906 inches in diameter and 3 inches in length, fitting standard drill chucks. Cutting direction is right hand. This is a general purpose bit sold individually.

The 50745 is designed for long reach drilling into cast iron and steel workpieces in applications where depth of penetration or clearance to the workpiece requires extended reach. Typical install scenarios include deep-hole work in structural steel, machinery frames, and cast iron housings. The Series 120X designation places this bit in a consistent product family used by machinists and maintenance trades in production and repair environments. Right-hand spiral and 2-flute geometry suit it for general-purpose through-hole and blind-hole work in ferrous materials.

Key Features

• 12-inch overall length with 9-inch flute for deep-reach drilling into cast iron and steel
• High speed steel construction with oxide finish for heat resistance and surface protection
• 118-degree notched point with web thinning reduces entry thrust and improves centering
• Tapered web configuration aids chip flow and reduces bit walking
• Straight-cylindrical shank at 0.3906 inches fits standard 3-jaw drill chucks
• Diameter tolerance held to +0.0000 to -0.0010 inches for consistent hole sizing

Compatibility

Designed as a general purpose extra length drill bit for use in standard drill chucks accepting a 0.3906-inch straight-cylindrical shank. Primary workpiece materials are cast iron and steel.

Installation Notes

Installation is performed by machinists, maintenance mechanics, or trained metalworking tradespeople using a drill press, magnetic drill, or hand drill with adequate chuck capacity. Secure the shank fully in the chuck and verify runout before drilling. Reduce feed rate and apply cutting fluid when drilling cast iron or steel to extend bit life and manage heat. Comply with applicable shop safety standards and OSHA machine guarding requirements during operation.