Hertel 77429066 Reduced Shank Drill Bit 1.5 in Hss

Product Description

The HERTEL 77429066 is a reduced shank drill bit designed for boring large-diameter holes in low and medium tensile strength materials. Built from high-speed steel (HSS) with an oxide finish, it delivers consistent cutting performance in production and maintenance environments. The 1.5-inch cutting diameter is paired with a 0.5-inch Weldon flat shank, allowing the bit to seat securely in standard chuck or holder setups without slipping under torque. At 6 inches overall length with a 3-inch flute length, it suits both drill press and milling machine applications. Right-hand spiral flutes clear chips efficiently during full-depth passes.

This bit is intended for drilling operations in metalworking trades, MRO maintenance, and fabrication shops. The reduced shank design allows a large cutting diameter to be driven by a smaller spindle or chuck rated for 0.5-inch shanks, which is a common setup on drill presses and knee mills. Three Weldon flats on the shank prevent rotational slip and are compatible with standard side-lock tool holders. Typical workpiece materials include mild steel, aluminum, soft cast iron, and similar low-to-medium tensile strength metals.

Key Features

• 1.5-inch cutting diameter with a 0.5-inch reduced Weldon flat shank for use in standard holders
• High-speed steel construction provides heat and wear resistance for general-purpose metal drilling
• 118-degree standard point angle for center-finding accuracy on flat stock
• Oxide finish reduces friction and provides light corrosion resistance during storage and use
• 3-inch flute length supports full-depth chip evacuation up to 3 inches maximum drilling depth
• Right-hand cut, regular spiral flutes suitable for most ferrous and non-ferrous metals

Compatibility

Designed as an OEM-style replacement or direct-use drill bit compatible with drill presses, milling machines, and magnetic drills equipped with 0.5-inch Weldon flat side-lock tool holders. Suited for use on low and medium tensile strength materials.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance trade professionals familiar with drill press and milling machine operation. Ensure the machine spindle is fully stopped and power is locked out before securing or removing the bit from the tool holder. Confirm the Weldon flat is properly aligned with the set screw in the side-lock holder before tightening to prevent axial pullout. Eye protection and appropriate chip guarding are required when operating.