Hertel 89321772 Screw Machine Drill Bit 31/64 in Hss

Product Description

The HERTEL 89321772 is a screw machine length drill bit ground from high-speed steel and finished bright and uncoated. Screw machine length bits are shorter than jobber-length drills, which improves rigidity and reduces deflection in close-tolerance drilling applications. This bit measures 31/64 inches in diameter (0.4844 inches decimal) with a 118-degree split point and an overall length of 3-11/16 inches. The right-hand cut and general-purpose grade make it a standard production choice for machinists, maintenance technicians, and fabricators drilling steel, aluminum, and similar materials in drill presses, lathes, and CNC applications.

This bit is suited for general-purpose metal drilling in screw machine operations, turret lathes, and production-run setups where a shorter flute length and tighter radial runout matter. The 2-3/16 inch flute length handles moderate chip evacuation requirements without the flex introduced by longer jobber bits. Typical users include machine shops, maintenance and repair operations, and industrial fabrication facilities working in the 0.4500 to 0.5000 inch diameter range.

Key Features

• 31/64 inch diameter (0.4844 inches decimal) for precise sizing in the 0.45 to 0.50 inch range
• 118-degree drill point angle for general-purpose entry into steel and non-ferrous metals
• Screw machine length body for improved rigidity and reduced bit deflection
• High-speed steel construction handles moderate heat buildup in production drilling
• Bright and uncoated finish with right-hand cut for standard drilling operations
• 2-3/16 inch flute length supports efficient chip evacuation in moderate-depth holes

Compatibility

Designed as a general-purpose screw machine length drill bit for use in standard drill chucks, screw machines, turret lathes, and drill presses accepting 31/64 inch shank diameters.

Installation Notes

This bit is installed and serviced by machinists and maintenance technicians working with drill presses, lathes, and production drilling equipment. Secure the bit fully in the chuck and verify runout before beginning a production run. Use appropriate cutting fluid for ferrous materials to extend tool life. Inspect the cutting edges for wear or chipping before each use and replace if the point shows signs of dulling or heat discoloration.