Chicago-latrobe 48371 Screw Machine Drill Bit 0.228 in Hss

Product Description

The CHICAGO-LATROBE 48371 is a screw machine length drill bit designed for high-production drilling in cast iron and steel. Built from high speed steel with a coated finish, it delivers a 0.228 inch diameter bore with a 135-degree split point that reduces walking and lowers thrust at entry. The shortened screw machine length body adds rigidity compared to jobber-length bits, making it a strong choice in drill presses and CNC turret setups where chatter control and hole accuracy matter. Overall length is 2-7/16 inches with a 1-5/16 inch flute length. Diameter tolerance is held to +0.0000 to -0.0007 inches, meeting ISO and NAS 907 specifications. This is a heavy-duty tool intended for professional metalworking and machining applications.

The 48371 fits residential shop, commercial machine shop, and industrial production environments wherever tight-tolerance drilling in steel or cast iron is required. The straight-cylindrical shank seats cleanly in standard drill chucks and quick-change holders. The wire size No. 1 designation places this bit in the 0.2000 to 0.2500 inch diameter range, making it a common selection for tapping prep, jig work, and close-tolerance through-hole drilling. Regular spiral fluting provides consistent chip evacuation without coolant-through requirements.

Key Features

• 135-degree split point reduces entry thrust and minimizes bit walking on hard materials
• Web-thinned, parallel web construction improves chip flow and reduces heat buildup
• High speed steel construction with coated finish for extended tool life in ferrous materials
• Screw machine length body increases rigidity and reduces deflection in short-reach applications
• Diameter held to +0.0000 to -0.0007 inches per ISO and NAS 907 standards
• Right-hand cut, 2-flute spiral configuration for efficient chip evacuation

Compatibility

Designed for drilling cast iron and steel. Compatible with standard drill chucks and quick-change tooling systems accepting a straight-cylindrical shank. Fits Series 2159 tooling requirements per NAS 907 and ISO specifications.

Installation Notes

This bit is installed and serviced by machinists, tool and die professionals, and skilled tradespeople operating drill presses, lathes, or CNC equipment. Before changing or setting a bit, ensure the machine is powered down and the spindle has come to a complete stop. Secure the shank fully within the chuck and verify runout before beginning a cut. Follow shop safety protocols and applicable OSHA machine guarding standards when operating rotating tooling.