Chicago-latrobe 48253 Screw Machine Drill Bit Letter V Hss

Product Description

The CHICAGO-LATROBE 48253 is a screw machine length drill bit engineered for heavy-duty metal cutting in production and maintenance environments. Built from high speed steel with a coated finish, this bit measures 0.377 inches in diameter (Letter V) and features a 135-degree split point that reduces walking and lowers thrust on entry. The web-thinned, parallel-web construction improves chip evacuation and reduces heat buildup at the cutting edge. Overall length is 3.25 inches with a flute length of 1.875 inches, making this a compact, rigid tool suited for close-clearance drilling operations on drill presses, lathes, and CNC equipment.

This bit is designed for drilling cast iron and steel in screw machine, production, and general machining applications. The straight-cylindrical shank seats securely in standard drill chucks and collet holders without slippage under load. Right-hand spiral flutes pull chips up and away from the cut. The screw machine length format provides added rigidity over jobber-length bits, making it a preferred choice when hole depth is shallow and positional accuracy matters. Machinists, tool-and-die workers, and maintenance technicians are the primary installers in both shop and field settings.

Key Features

• Letter V diameter (0.377 inches) with a tight tolerance of +0.0000 to -0.0010 inches for precision hole sizing
• 135-degree split point reduces drill walk and cutting thrust on hard metals
• Web-thinned, parallel-web design improves chip flow and reduces heat at the tip
• High speed steel construction with coated finish for extended tool life in steel and cast iron
• Screw machine length format delivers superior rigidity over jobber-length alternatives in short-hole applications
• Meets NAS 907 specification and ISO standards for dimensional consistency

Compatibility

Designed for use in standard drill chucks and collet holders accepting straight-cylindrical shanks. Suitable for drilling cast iron and steel across screw machine, production machining, and general maintenance applications.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with metal-cutting operations. Secure the shank fully in the chuck or collet before operation and verify runout before drilling. Always wear appropriate eye protection and follow machine guarding requirements. Do not exceed the rated feed and speed parameters for the workpiece material and bit diameter.