Hertel 77428944 Reduced Shank Drill Bit 1-5/64 in Hss

Product Description

The HERTEL 77428944 is a reduced shank drill bit designed for drilling into low and medium tensile strength materials such as mild steel, aluminum, cast iron, and similar metals. It features a 1-5/64 inch (1.0781 inch decimal) cutting diameter with a reduced 1/2 inch Weldon flat shank, allowing it to seat securely in standard chucks and tool holders without requiring a full-diameter collet. Built from high-speed steel with an oxide finish, this bit offers solid wear resistance for production and maintenance drilling applications. It is right-hand cut with a standard 118-degree point angle and spiral flutes for efficient chip evacuation.

This drill bit suits metalworking applications in fabrication shops, maintenance facilities, and general industrial settings. The reduced shank design makes it compatible with 1/2 inch capacity drill chucks and tool holders, even though the cutting diameter exceeds that size. The 3-inch flute length supports drilling to a maximum depth of 3 inches, making it appropriate for through-holes and moderate-depth blind holes in plate stock, structural steel, and similar workpieces.

Key Features

• 1-5/64 inch cutting diameter (1.0781 inch decimal) with a reduced 1/2 inch shank for standard chuck compatibility
• High-speed steel construction for durability in low and medium tensile strength materials
• Oxide finish provides basic corrosion resistance and reduces friction during cutting
• Standard 118-degree point angle for general-purpose drilling in metal
• Weldon flat shank with 3 flats prevents shank slippage in set-screw tool holders
• Right-hand spiral flutes promote efficient chip removal during through-hole and blind-hole drilling

Compatibility

Designed for use with 1/2 inch capacity drill chucks and Weldon-style tool holders. Suitable for drilling low and medium tensile strength materials including mild steel, aluminum, and cast iron.

Installation Notes

Installation is performed by machinists and maintenance technicians using drill presses, milling machines, or magnetic drills equipped with 1/2 inch Weldon-style tool holders. Secure the shank fully in the holder and tighten all set screws against the flats before use. Power down and lock out the machine before changing bits. Coolant is not required for this bit but can be used to extend tool life in high-cycle applications.