Hertel 77428852 Reduced Shank Drill Bit 59/64 in Hss

Product Description

The HERTEL 77428852 is a reduced shank twist drill bit designed for drilling through low and medium tensile strength materials in production and maintenance environments. Built from high-speed steel with an oxide finish, this bit features a 59/64 inch (0.9210 inch decimal) cutting diameter paired with a 1/2 inch Weldon flat shank that locks securely into compatible chucks and holders. The 118-degree standard point angle suits general-purpose drilling applications. Overall length is 6 inches with a 3 inch flute length, giving it solid reach without excessive flex. The right-hand spiral flute design efficiently clears chips during drilling. Machinists, tool and die workers, and maintenance technicians are the primary users of this style of bit.

This drill bit is suited for use in drill presses, milling machines, and CNC equipment equipped with 1/2 inch Weldon-style tool holders. The reduced shank design allows a larger cutting diameter to be used with a standard 1/2 inch chuck or collet without requiring an oversized spindle. Typical applications include structural steel fabrication shops, metal maintenance facilities, and general manufacturing environments where drilling into low and medium tensile strength metals is a routine task. The 3-flat Weldon shank resists slipping under torque loads compared to a smooth round shank.

Key Features

• 59/64 inch cutting diameter (0.9210 inch decimal) with a reduced 1/2 inch Weldon flat shank
• High-speed steel construction for durability in metal drilling applications
• 118-degree standard point angle for general-purpose use in low and medium tensile strength materials
• Oxide finish helps reduce friction and provides light corrosion resistance during storage
• 3-flat Weldon shank prevents rotational slippage in compatible tool holders
• Right-hand spiral flutes with regular spiral type for efficient chip evacuation

Compatibility

Designed for use with 1/2 inch Weldon-style chuck holders and drill press or milling machine spindles accepting a 1/2 inch shank. Intended for drilling low and medium tensile strength materials as specified by the manufacturer.

Installation Notes

Installation and operation of this drill bit should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Ensure the machine spindle is fully powered down and locked out before inserting or removing the bit from the tool holder. Confirm all Weldon flat set screws are properly tightened against the shank flats before initiating a cut. Eye protection and appropriate machine guarding are required during operation per standard shop safety practices.