Hertel 89321434 Screw Machine Drill Bit 21/64 in Hss

Product Description

The HERTEL 89321434 is a screw machine length drill bit designed for general-purpose drilling in metal, wood, and plastic. Its shortened overall length of 2-15/16 inches provides increased rigidity compared to jobber-length bits, reducing deflection and improving hole accuracy in tight spaces or on drill press setups. The bit is manufactured from high-speed steel and features a standard 118-degree split or conventional point angle. The bright, uncoated finish makes it well suited for softer ferrous and non-ferrous materials where coating is not required. Machinists, tool-and-die technicians, and maintenance trades rely on this format for production drilling where chuck clearance is limited.

This bit is appropriate for use in screw machines, turret lathes, drill presses, and hand-held electric drills where a stub-length tool is preferred. The 21/64 inch diameter and 1-11/16 inch flute length make it a practical choice for through-hole and blind-hole applications in light manufacturing, maintenance, and fabrication environments. It is sized within the 0.3000 to 0.3500 decimal inch range for applications requiring close-tolerance hole sizing.

Key Features

• 21/64 inch (0.3281 inch decimal) diameter for precise hole sizing
• Shortened 2-15/16 inch overall length increases rigidity and reduces deflection
• 118-degree point angle suits general-purpose drilling in a wide range of materials
• High-speed steel construction withstands heat generated during metal drilling
• Bright, uncoated finish appropriate for softer metals, wood, and plastics
• Right-hand cutting direction compatible with standard drill chucks and machines

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard 3-jaw drill chucks and collet systems accepting 21/64 inch shank diameters, suitable for use in screw machines, turret lathes, drill presses, and variable-speed hand drills.

Installation Notes

Secure the bit firmly in the chuck or collet before operation and verify there is no runout before beginning a cut. De-energize all machine power and lock out the spindle before changing bits. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend tool life. Verify workpiece is properly fixtured or clamped to prevent movement during drilling.