Hertel 89321939 Screw Machine Drill Bit 55/64 in Hss

Product Description

The HERTEL 89321939 is a screw machine length drill bit designed for high-speed steel cutting in metal fabrication and general machining applications. It features a 55/64 inch (0.8594 inch decimal) diameter, a 118-degree split or standard point angle, and a bright uncoated finish. At 5.5 inches overall length with a 3.5-inch flute length, this stub-length configuration provides added rigidity over jobber-length bits, reducing deflection in production drilling. Right-hand cut geometry is standard for conventional drill press and CNC operation. General purpose grade construction suits a wide range of ferrous and non-ferrous materials.

Screw machine length drill bits are used in production machining, tool rooms, and maintenance environments where shorter flute-to-diameter ratios improve accuracy and reduce chatter. This bit is well suited for drill presses, turret lathes, CNC machining centers, and gang drilling fixtures. The 55/64 inch size falls in the larger-diameter stub range and is commonly selected for reaming prep holes, clearance drilling, and stepped-bore operations in steel, cast iron, aluminum, and similar materials. Machinists, maintenance mechanics, and industrial trades installers are the typical end users.

Key Features

• 55/64 inch (0.8594 inch) diameter for large-bore drilling applications
• 118-degree point angle for general purpose use across common metals
• High-speed steel construction provides heat resistance during sustained cutting
• Bright uncoated finish allows easy visual inspection for wear
• Screw machine (stub) length at 5.5 inches OAL improves rigidity and reduces deflection
• Right-hand cut compatible with standard drill press and CNC spindle rotation

Compatibility

Designed as a general purpose screw machine length drill bit suitable for use in standard drill chucks, drill presses, turret lathes, and CNC machining centers that accept large-diameter straight-shank tooling.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance mechanics familiar with metal cutting operations. Ensure the drill chuck is fully tightened and the workpiece is securely fixtured before operation. Machine spindle speed should be set per the material being drilled and the bit diameter. Eye protection and appropriate machine guarding are required during use.