Hertel 02388239 Reduced Shank Drill Bit 1-29/64 in Hss

Product Description

The HERTEL 02388239 is a reduced shank twist drill bit designed for drilling through low and medium tensile strength materials in metalworking and general machining applications. The bit measures 1-29/64 inches (1.4531 inches decimal) in cutting diameter with a reduced 1/2 inch straight-cylindrical shank, allowing it to be chucked in standard 1/2 inch drill chucks despite its larger cutting diameter. Overall length is 6 inches with a 3 inch flute length. Constructed from high-speed steel with an oxide finish, it cuts in the right-hand direction and features a standard 118-degree point angle with regular spiral fluting.

This drill bit is suited for production and maintenance applications where drilling large-diameter holes is required but chuck capacity is limited to 1/2 inch. Typical uses include structural fabrication, plate work, and maintenance machining on mild steel, aluminum, brass, and similar low to medium tensile strength materials. The reduced shank design makes large-diameter drilling accessible on standard bench drills, magnetic drills, and drill presses without requiring a large-capacity chuck. No coolant through capability is included.

Key Features

• 1-29/64 inch cutting diameter with 1/2 inch reduced shank for use in standard chucks
• 118-degree standard point angle for general-purpose drilling in metals and soft materials
• High-speed steel construction for durability across common shop materials
• Oxide finish provides mild corrosion resistance and reduces friction during cutting
• Regular spiral fluting with right-hand cut for efficient chip evacuation
• 3 inch maximum drilling depth matches the flute length

Compatibility

Designed as a general-purpose reduced shank drill bit for use in 1/2 inch keyed or keyless drill chucks on drill presses, bench drills, and magnetic base drills when drilling low and medium tensile strength materials.

Installation Notes

Installation is performed by machinists or maintenance technicians using a drill press, magnetic drill, or similar machine equipped with a 1/2 inch chuck. Secure the shank fully into the chuck and verify the bit runs true before drilling. Always match feed rate and spindle speed to the workpiece material and bit diameter - large-diameter bits require significantly lower RPM than small-diameter bits. Clamp workpieces securely to prevent rotation during drilling.