Hertel 74147679 Cobalt Drill Bit 57/64 in 1/2 in Shank

Product Description

The HERTEL 74147679 is a reduced shank cobalt drill bit designed for drilling into tough, high tensile strength materials where standard high-speed steel bits fall short. The bit measures 57/64 inch (0.8906 inch decimal) in cutting diameter with a reduced 1/2 inch straight-cylindrical shank, allowing it to chuck into standard 1/2 inch capacity drill presses and hand drills. Overall length is 6 inches with a 3 inch spiral flute length. The 118 degree standard point angle suits general-purpose drilling across a wide range of ferrous and hard alloy workpieces. An oxide straw finish provides added surface protection and reduces friction during cutting. Right-hand cut geometry is standard.

This bit is suited for metalworking applications in industrial, maintenance, and fabrication environments. Typical use cases include drilling through high-strength steel, alloy steel, stainless steel, and similar tough materials where cobalt content in the tool steel provides increased heat resistance and edge retention over standard M2 bits. The reduced shank design extends the usable diameter range of existing 1/2 inch chuck equipment without requiring a larger drill press or specialized tooling. It is commonly used by machinists, maintenance mechanics, pipefitters, and millwrights working in production or field repair contexts.

Key Features

• Cobalt tool material for improved heat resistance and edge retention in hard and tough alloys
• 57/64 inch cutting diameter (0.8906 inch decimal) with a reduced 1/2 inch straight-cylindrical shank
• 118 degree standard point angle for general-purpose metalworking entry
• 3 inch spiral flute length with regular helix for efficient chip evacuation
• Oxide straw finish reduces friction and provides light corrosion resistance
• Right-hand cut, 6 inch overall length - compatible with standard drill press and hand drill setups

Compatibility

Designed for use in any drill press, magnetic drill, or hand drill with a 1/2 inch or larger chuck capacity. Intended primary workpiece materials are tough, high tensile strength metals including alloy steels and hardened ferrous stock.

Installation Notes

Install and remove this bit with the machine fully powered down and the chuck key removed before releasing the spindle. Secure the workpiece firmly before beginning the cut to prevent walking on entry. Use a center punch to establish a starting point when drilling hard stock. Cutting fluid or coolant is not required per specification but may extend tool life when drilling continuously in high-tensile alloys.