Hertel 83240663 Cobalt Drill Bit 1-3/8 in 135 Deg

Product Description

The HERTEL 83240663 is a reduced shank cobalt drill bit designed for drilling into hardened stainless steel, heat treated alloy, and high temperature alloy. It features a 1-3/8 inch cutting diameter with a 1/2 inch straight-cylindrical shank, allowing it to fit standard 1/2 inch chucks despite its large cutting diameter. The 135-degree notched split point reduces walking on entry and requires less thrust compared to conventional 118-degree points. A titanium nitride (TiN) coating increases surface hardness and extends tool life in abrasive materials. This bit is intended for professional machinists, pipefitters, HVAC fabricators, and metalworkers who regularly bore large-diameter holes in tough alloys.

This drill bit is suited for general-purpose production and maintenance drilling in ferrous metals, including hardened stainless steel and heat treated alloy stock. Typical applications include drilling mounting holes, pipe penetrations, and component bores in industrial and mechanical trade settings. The right-hand spiral flute geometry promotes efficient chip evacuation during through-hole drilling in thick-walled materials. It is sold individually and used in hand-held drill presses or vertical milling setups where a 1/2 inch chuck is the available drive interface.

Key Features

• 1-3/8 inch cutting diameter with a reduced 1/2 inch shank for use in standard 1/2 inch chucks
• 135-degree notched split point for self-centering entry and reduced thrust on hard metals
• Cobalt tool steel construction for heat resistance in hardened stainless and high-temp alloys
• Titanium nitride (TiN) coating for increased surface hardness and extended tool life
• 3 inch flute length and 6 inch overall length for through-hole drilling in moderate stock thickness
• Right-hand cut with regular spiral flutes for consistent chip removal

Compatibility

Designed for use in drill presses or machine setups equipped with a 1/2 inch chuck capacity. Primary workpiece materials include hardened stainless steel, heat treated alloy, and high temperature alloy.

Installation Notes

This bit is intended for use by trained machinists or trade professionals operating drill presses, magnetic drills, or milling machines. Secure the workpiece firmly before drilling and confirm the chuck is tightened properly on the 1/2 inch shank. No coolant through-tool feature is present; external cutting fluid is recommended when drilling hardened alloys to manage heat buildup. Inspect the cutting edges and TiN coating before each use and replace the bit if chipping or coating wear is observed.