Hertel 77428910 Reduced Shank Drill Bit 1-1/64 in Hss

Product Description

The HERTEL 77428910 is a reduced shank drill bit engineered for drilling into low and medium tensile strength materials. It features a 1-1/64 inch (1.0156 inch decimal) cutting diameter paired with a 1/2 inch Weldon flat shank, allowing it to seat securely in Weldon-style tool holders. The bit is ground from high-speed steel with an oxide finish that provides basic lubricity and corrosion resistance during operation. A standard 118-degree point angle suits general-purpose hole-making in mild steel, aluminum, plastics, and similar workpiece materials. The 3-flute Weldon shank design prevents slipping under torque, making this bit well suited for drill press and milling machine setups where positive drive is required.

This bit is intended for shop, maintenance, and field applications where a larger-diameter hole is needed but the available spindle or chuck accepts only a 1/2 inch shank. Typical use cases include metalworking, fabrication, and general maintenance tasks on structural components, plates, and tubing made from low to medium tensile strength alloys. The right-hand spiral flute geometry clears chips efficiently during through-hole and blind-hole operations. Machinists, millwrights, and maintenance technicians working with drill presses, knee mills, or CNC machines with Weldon-style toolholders will find this bit a direct fit.

Key Features

• 1-1/64 inch cutting diameter (1.0156 inch decimal) with reduced 1/2 inch Weldon flat shank
• 118-degree standard point angle for general-purpose drilling in low and medium tensile strength materials
• High-speed steel construction with oxide finish for basic wear and corrosion resistance
• 3-flat Weldon shank prevents rotational slipping under cutting torque
• Right-hand spiral flute with regular spiral type for efficient chip evacuation
• 6 inch overall length with 3 inch flute length and maximum drilling depth of 3 inches

Compatibility

Designed for use in Weldon-style toolholders accepting a 1/2 inch shank diameter. Suitable for drill presses, knee mills, and machining centers configured for Weldon flat-shank tooling when drilling low and medium tensile strength materials.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician. Ensure the machine spindle is fully powered down and locked out before loading or removing the bit. Seat the Weldon flat fully against the set screw in the toolholder and tighten the set screw securely to prevent axial or rotational movement during cutting. Verify spindle speed is appropriate for the workpiece material and bit diameter before beginning the drilling operation.