Hertel 74147497 Cobalt Drill Bit 39/64 in 1/2 in Shank

Product Description

The HERTEL 74147497 is a reduced shank cobalt drill bit designed for drilling tough, high tensile strength materials in demanding industrial and trade applications. The bit measures 39/64 inch (0.6094 inch) in diameter with a 1/2 inch straight-cylindrical shank, allowing it to seat in standard 1/2 inch chucks even though the cutting diameter is larger. Overall length is 6 inches with a 3 inch flute length. The 118-degree standard point angle provides a reliable, self-centering entry. The oxide straw finish helps reduce friction and surface wear during cutting.

This drill bit is suited for machinists, tool-and-die workers, maintenance mechanics, and fabricators who regularly work with alloy steels, stainless steels, and other tough high tensile strength materials. The cobalt construction maintains cutting hardness at elevated temperatures, making it appropriate for production drilling where heat buildup is a concern. Right-hand cut spiral flutes evacuate chips efficiently during through-hole and blind-hole operations in both shop and field environments.

Key Features

• Cobalt tool material retains hardness under high heat, extending tool life in tough alloys
• Reduced shank design allows 39/64 inch cutting diameter to run in a standard 1/2 inch chuck
• 118-degree standard point angle for reliable self-centering on most materials
• Oxide straw finish reduces friction and protects the flute surface
• 3 inch flute length provides a maximum drilling depth of 3 inches
• Right-hand cut, regular spiral flutes for efficient chip evacuation

Compatibility

Designed as an OEM-style replacement or direct-use reduced shank cobalt drill bit compatible with any drill press, milling machine, or hand drill accepting a 1/2 inch straight-cylindrical shank.

Installation Notes

This bit is installed by a machinist or maintenance mechanic using a 1/2 inch drill chuck on a drill press, milling machine, or heavy-duty hand drill. Ensure the chuck is fully tightened and the workpiece is firmly clamped before drilling. No coolant is required per specification, but reducing feed pressure when breaking through the far side of the workpiece helps prevent bit deflection and burring. Inspect the cutting edges for wear regularly when drilling abrasive or hardened materials.