Hertel 77428993 Reduced Shank Drill Bit 1-11/64 in Hss

Product Description

The HERTEL 77428993 is a reduced shank drill bit designed for drilling into low and medium tensile strength materials. It features a 1-11/64 inch (1.1719 inch decimal) cutting diameter with a 1/2 inch Weldon flat shank, allowing it to seat securely in compatible chucks and holders. The 118-degree standard point angle suits general-purpose drilling applications. Manufactured from high-speed steel with an oxide finish, this bit offers solid wear resistance for production and maintenance drilling tasks. The overall length is 6 inches with a 3-inch flute length and a maximum drilling depth of 3 inches. Licensed HVAC technicians, machinists, plumbers, and electricians working with metal framing or structural components will find this bit suited for repetitive hole-making in shop and field environments.

This drill bit is intended for use on low and medium tensile strength materials such as mild steel, aluminum, and similar metals. The Weldon flat shank with three flats prevents slippage in set-screw style tool holders, making it a reliable choice for drill press, milling machine, and magnetic drill applications. The right-hand spiral flute design clears chips efficiently during through-hole and blind-hole operations. It is well suited to contractors, maintenance technicians, and fabricators who need a consistent, repeatable hole size in the 1-11/64 inch range.

Key Features

• 1-11/64 inch (1.1719 inch decimal) cutting diameter for precise, consistent hole sizing
• 1/2 inch Weldon flat shank with three flats prevents rotation in set-screw holders
• 118-degree standard point angle for general-purpose drilling in metal
• High-speed steel construction provides durability across repeated use cycles
• Oxide finish offers baseline corrosion and wear resistance
• Right-hand, regular spiral flute for efficient chip evacuation

Compatibility

Designed as a direct-fit reduced shank drill bit for use in 1/2 inch Weldon-style tool holders and compatible drill chucks on drill presses, milling machines, and magnetic drills.

Installation Notes

Installation should be performed by a qualified machinist or tradesperson familiar with rotary cutting tools. Secure the Weldon shank fully into the tool holder and tighten all set screws against the flats before operation. Ensure the drilling machine is powered off and locked out before changing or inspecting bits. Do not exceed the rated drilling depth of 3 inches, and use appropriate cutting fluid or coolant as required by the workpiece material and machine setup.