Hertel 77428811 Reduced Shank Drill Bit 55/64 in Hss

Product Description

The HERTEL 77428811 is a reduced shank twist drill bit designed for drilling into low and medium tensile strength materials in production and maintenance environments. Built from high-speed steel with an oxide finish, it measures 55/64 inch (0.8594 inch decimal) in drill diameter with a 1/2 inch Weldon flat shank. The overall length is 6 inches with a 3 inch flute length and a standard 118 degree point angle. The Weldon shank with three flats prevents slipping in compatible chucks and holders, making it a reliable choice for high-torque drilling applications. Right-hand spiral flutes clear chips efficiently during through-hole and blind-hole operations.

This drill bit is suited for use in drill presses, milling machines, and hand-held power tools equipped with a 1/2 inch Weldon-style holder. Typical applications include fabrication shops, maintenance facilities, and industrial production lines working with mild steel, aluminum, and similar low to medium tensile strength workpiece materials. The reduced shank design allows a larger diameter bit to be used in standard 1/2 inch capacity chucks without requiring a larger spindle or collet system.

Key Features

• 55/64 inch (0.8594 inch decimal) drill diameter for precise hole sizing
• 1/2 inch Weldon flat shank with three flats prevents rotation under load
• 118 degree standard point angle for general-purpose drilling
• High-speed steel construction handles demanding production environments
• Oxide finish provides mild lubricity and corrosion resistance
• Right-hand, regular spiral flutes promote efficient chip evacuation

Compatibility

Designed for use with 1/2 inch Weldon-style drill chucks and tool holders commonly found on drill presses and milling machines. Compatible with low and medium tensile strength workpiece materials per manufacturer specification.

Installation Notes

Installation is performed by machinists and maintenance technicians using a 1/2 inch Weldon chuck or end mill holder. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit. Verify all set screws on the Weldon holder are properly tightened against the flats before operation. Inspect the cutting edges for wear or damage before each use and replace if chipping or dullness is observed.