Hertel 89321251 Screw Machine Drill Bit 31/32 in Hss

Product Description

The HERTEL 89321251 is a screw machine length drill bit designed for high-volume drilling applications where a shorter, stiffer tool is preferred over a jobber-length bit. Ground from high-speed steel (HSS) with a bright uncoated finish, this bit features a 118-degree split-point angle and right-hand cutting direction. The reduced overall length of 5-7/8 inches adds rigidity, which helps control deflection when drilling in tight spaces or on drill press setups. At 31/32 inch (0.9688 inch) in diameter, this bit is suited for general-purpose hole-making in ferrous and non-ferrous materials. Machinists, tool-and-die workers, and maintenance technicians are the primary users.

Screw machine length drill bits are a standard choice in production machining environments, repair shops, and maintenance facilities where reduced bit length improves concentricity and reduces chatter. This bit is appropriate for drilling steel, cast iron, aluminum, brass, and similar materials in both manual and CNC drill press operations. The general-purpose grade and uncoated finish make it compatible with standard cutting fluids or dry drilling depending on the base material.

Key Features

• 31/32 inch diameter (0.9688 inch decimal) for accurate, consistent hole sizing
• High-speed steel construction provides durability across a broad range of workpiece materials
• 118-degree point angle is the standard general-purpose geometry for versatile material compatibility
• Screw machine length (5-7/8 inches OAL) offers increased rigidity compared to jobber-length bits
• 3-7/8 inch flute length provides adequate chip evacuation for typical hole depths
• Bright uncoated finish works with most standard cutting fluids without chemical interaction concerns

Compatibility

Designed as a general-purpose screw machine length drill bit suitable for use in standard drill chucks, drill presses, lathes, and CNC machining centers accepting 31/32 inch shank tooling.

Installation Notes

Secure the bit firmly in a properly sized drill chuck before operation and verify chuck key is removed before powering the machine. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain surface finish quality. Inspect the cutting edges and point geometry before each use and replace or resharpen the bit if chipping or dulling is observed. Machinists and maintenance technicians should follow applicable shop safety standards and machine manufacturer guidelines during setup and operation.