Hertel 77428712 Reduced Shank Drill Bit 45/64 in Hss

Product Description

The HERTEL 77428712 is a reduced shank twist drill bit designed for precision hole-making in low and medium tensile strength materials. Built from high-speed steel (HSS) with an oxide finish, this bit measures 45/64 inch (0.7031 inch) in diameter with a 1/2 inch Weldon flat shank. The overall length is 6 inches with a 3 inch spiral flute length, providing a maximum drilling depth of 3 inches. The 118-degree standard point angle suits general-purpose drilling applications. The three-flat Weldon shank provides positive torque transfer and resists bit slippage in compatible chucks and holders.

This drill bit is suited for metalworking operations in machine shops, maintenance facilities, and production environments. The reduced shank design allows a larger-diameter bit to be used in a standard 1/2 inch chuck or toolholder. Right-hand spiral flutes clear chips efficiently during drilling. Typical applications include drilling through mild steel, aluminum, brass, and other low to medium tensile strength materials where a standard jobber-length bit would be insufficient in diameter.

Key Features

• 45/64 inch (0.7031 inch) drill diameter with reduced 1/2 inch Weldon flat shank for use in standard holders
• 118-degree standard point angle for general-purpose drilling
• High-speed steel construction for durability in metalworking applications
• Oxide finish for basic lubricity and corrosion resistance during storage and use
• Three-flat Weldon shank prevents bit rotation and slippage under load
• Right-hand cut with regular spiral flutes for efficient chip evacuation

Compatibility

Designed for use with 1/2 inch Weldon-style toolholders and compatible drill chucks. Suited for low and medium tensile strength workpiece materials including mild steel, aluminum, and similar metals.

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance technician familiar with drill press or milling machine operation. Ensure the machine spindle is fully stopped and power is disconnected before changing tooling. Secure the Weldon flat shank firmly in the toolholder set screw to prevent axial and rotational slippage. Follow applicable workplace safety standards and machine manufacturer guidelines for cutting speeds and feeds appropriate to the workpiece material.