Chicago-latrobe 48228 Screw Machine Drill Bit 7/16 in

Product Description

The CHICAGO-LATROBE 48228 is a screw machine length drill bit designed for high-production drilling in cast iron and steel. Built from high speed steel (HSS) with a coated finish, it features a 135-degree split point that reduces walking and cuts through hard workpieces without a center punch. The web-thinned, parallel web construction lowers thrust and improves chip evacuation. At 7/16 inch (0.4375 inches) in diameter, it fits standard drill chucks and is rated for heavy-duty performance across industrial and trade applications. This is a Series 2159 bit meeting NAS 907 and ISO standards.

This bit is suited for metalworking applications where a shorter, stiffer drill reduces deflection in deep or interrupted cuts. The screw machine length body — 3-7/16 inches overall with a 2-1/16 inch flute length — provides rigidity in drill press, CNC, and turret lathe setups. Primary workpiece materials are cast iron and steel. The straight-cylindrical shank seats cleanly in standard drill chucks or collet holders without requiring special adapters. Machinists, millwrights, and maintenance trades commonly use this bit for production runs, fixture work, and field fabrication.

Key Features

• 135-degree split point reduces bit walking and lowers required thrust on hard materials
• Web-thinned, parallel web design improves chip flow and reduces heat buildup
• High speed steel construction with coated finish for extended tool life in ferrous metals
• Screw machine length body provides added rigidity versus jobber-length bits
• Right-hand spiral flute with regular helix for consistent chip evacuation
• Diameter tolerance held to +0.0000 to -0.0010 inches for precise hole sizing

Compatibility

Designed for use in standard drill presses, CNC machining centers, turret lathes, and hand-held drill motors accepting a straight-cylindrical shank. Rated for cast iron and steel workpieces per Series 2159 specifications.

Installation Notes

Secure the shank fully in the chuck or collet before operation and verify runout before starting a production run. Use appropriate cutting fluid or coolant when drilling steel to reduce heat and extend tool life, noting this bit does not support through-coolant. Inspect the split point for chipping before reuse, and redress or replace bits that show wear to maintain hole tolerance. Disposal of HSS tooling should follow applicable shop and local regulations for metal waste.