Hertel 77428969 Reduced Shank Drill Bit 1-7/64 in Hss

Product Description

The HERTEL 77428969 is a reduced shank twist drill bit designed for drilling into low and medium tensile strength materials including mild steel, aluminum, and similar metals. The bit features a 1-7/64 inch cutting diameter paired with a 1/2 inch Weldon flat shank, allowing it to seat securely in side-lock tool holders without slipping under torque. Manufactured from high-speed steel with an oxide finish, the 77428969 carries a standard 118-degree point angle suited for general-purpose drilling applications. Overall length is 6 inches with a 3 inch flute length and right-hand spiral fluting. Licensed machinists, tool-and-die workers, and maintenance mechanics are the primary users.

This drill bit is built for stationary drill presses, milling machines, and similar machine tool setups where a Weldon flat shank is required to prevent rotation under load. The reduced shank design lets a 1/2 inch capacity chuck or collet drive a cutting diameter larger than the shank itself, extending the useful range of standard tooling without requiring a larger spindle. Typical applications include hole-making in structural steel, plate stock, and medium-density alloys in fabrication shops, maintenance facilities, and manufacturing environments.

Key Features

• 1-7/64 inch cutting diameter with a 1/2 inch reduced Weldon flat shank for secure side-lock holding
• Three-flat Weldon shank geometry prevents bit rotation in the holder under heavy feed loads
• 118-degree standard point angle for general-purpose drilling in low and medium tensile strength materials
• High-speed steel construction provides wear resistance at elevated cutting temperatures
• Oxide finish improves lubricity and provides light corrosion resistance during storage and use
• Right-hand spiral fluting with regular helix promotes chip evacuation in through-hole and blind-hole applications

Compatibility

Designed as a general-purpose reduced shank drill bit for use in machine tools equipped with 1/2 inch side-lock Weldon flat tool holders, collet chucks, or drill press chucks rated for 1/2 inch shank tooling. Rated for low and medium tensile strength workpiece materials.

Installation Notes

Installation is performed by machining professionals or maintenance mechanics familiar with rotating cutting tool setups. Secure the Weldon flat shank fully into the side-lock holder and tighten the set screw against the flat before operation. Ensure the machine spindle is fully stopped and locked out before changing tooling. Do not exceed the drill press or milling machine spindle speed rating for the selected cutting diameter and material.