Chicago-latrobe 50485 Extra Length Drill Bit 0.25 in Hss

Product Description

The CHICAGO-LATROBE 50485 is a high speed steel extra length drill bit designed for long-reach drilling applications in metal fabrication, maintenance, and mechanical work. It carries a 0.25 inch (1/4 inch, Letter E) diameter with an overall length of 8 inches, giving technicians and tradespeople the reach needed to drill through deep sections or access recessed bores that standard-length bits cannot reach. The oxide finish improves lubrication retention and corrosion resistance during cutting. A 118-degree notched point and web-thinned, tapered web construction reduce entry force and improve chip ejection from the start of the cut.

This bit is suited for drilling cast iron and steel in residential, commercial, and industrial service environments. The Series 120X extra length design is commonly used by HVAC technicians, pipefitters, electricians, and mechanical contractors when drilling through structural members, deep flanges, or framing where a jobber-length bit would not reach. The straight-cylindrical shank accepts standard three-jaw drill chucks without adapters, making it compatible with corded and cordless drilling equipment already on the job site.

Key Features

• High speed steel construction for drilling cast iron and steel
• 118-degree notched point with web thinning for reduced thrust and faster breakthrough
• 8 inch overall length with 5.5 inch flute length for long-reach access
• Oxide finish aids lubrication retention and surface protection during use
• Regular spiral, two-flute design promotes consistent chip evacuation
• Diameter tolerance of +0.0000 to -0.0010 inches for accurate hole sizing

Compatibility

Designed as a general-purpose extra length drill bit for use in standard three-jaw drill chucks; compatible with drilling equipment accepting a 0.25 inch straight-cylindrical shank.

Installation Notes

This bit is installed and operated by machinists, mechanical contractors, and trade professionals using hand-held or bench-mounted drilling equipment. Secure the straight shank fully in the chuck before use and verify chuck key is removed prior to powering the tool. Use appropriate cutting fluid when drilling steel to extend bit life and reduce heat buildup. Follow applicable OSHA and shop-safety protocols for rotating cutting tools, including eye protection and secure workpiece clamping.