Chicago-latrobe 50729 Extra Length Drill Bit 0.2188 in Hss

Product Description

The CHICAGO-LATROBE 50729 is a high speed steel extra length drill bit designed for long-reach drilling applications where standard-length bits cannot access the work zone. The bit measures 0.2188 inches in diameter with a 12-inch overall length and a 9-inch spiral flute length, giving technicians the extended reach needed for deep-hole work in cast iron and steel. The 118-degree notched point and web-thinned, tapered web configuration reduce entry resistance and improve chip evacuation. An oxide finish provides a baseline level of surface hardness and lubricity. This bit suits machinists, maintenance technicians, and fabricators working in metal trades.

The 50729 is built for long-reach drilling in cast iron and steel workpieces, making it a practical choice for structural fabrication, maintenance repair, and machine shop applications where hole depth or obstruction clearance rules out shorter tooling. The straight-cylindrical shank measures 0.2188 inches in diameter with a 3-inch shank length, compatible with standard drill chucks. Right-hand cutting direction and a regular spiral type make this a conventional, general-purpose configuration that fits common drill press and hand-drill setups.

Key Features

• 0.2188-inch diameter with tight tolerance of +0.0000 to -0.0007 inches for accurate hole sizing
• 12-inch overall length and 9-inch flute length for extended reach in deep or obstructed drilling
• 118-degree notched point for reduced entry force and improved centering on metal surfaces
• Web-thinned, tapered web configuration improves chip clearance and reduces thrust load
• High speed steel construction with oxide finish for general-purpose metal cutting durability
• Two-flute spiral design with right-hand cutting direction for standard drill equipment compatibility

Compatibility

Designed as a general-purpose extra length drill bit for use in cast iron and steel workpieces. Compatible with standard straight-cylindrical drill chucks accepting a 0.2188-inch shank. Part of the Chicago-Latrobe Series 120X extra length line.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with metal drilling operations. Secure the workpiece fully before drilling and confirm chuck grip on the straight-cylindrical shank before applying feed pressure. Reduce spindle speed and feed rate when drilling deep holes to manage heat buildup and chip packing. Always use appropriate cutting fluid for the workpiece material and wear proper eye protection in compliance with applicable shop safety standards.