Hertel 74131566 Screw Machine Drill Bit 23/64 in Cobalt

Product Description

The HERTEL 74131566 is a screw machine length drill bit designed for high-performance drilling in tough materials. It measures 23/64 inches (0.3594 inches decimal) in diameter with a 3-1/16 inches overall length and a 1-3/4 inches flute length, making it a compact, stub-style bit suited for close-quarter or machine-mounted drilling operations. The bit is manufactured from cobalt steel and finished with a TiAlN coating, which provides heat resistance and extends tool life in hard or abrasive workpieces. A 135-degree split point reduces walking on entry and lowers thrust requirements. This bit is installed by machinists, tool and die technicians, and maintenance tradespeople working with drill presses, CNC machines, or hand-held power tools.

Screw machine length drill bits are commonly used in production machining, metal fabrication shops, and maintenance environments where shorter overall length provides added rigidity and reduced deflection. The 74131566 is suited for drilling into steel, stainless steel, cast iron, and other hard metals where standard high-speed steel bits wear prematurely. Its straight cylindrical shank fits standard three-jaw chucks and collet-style tool holders found on most machine tools. Web-thinned geometry reduces cutting forces and improves chip evacuation in deeper holes.

Key Features

• Cobalt steel construction withstands elevated drilling temperatures in hard metals
• TiAlN coating extends tool life and reduces friction at the cutting edge
• 135-degree split point reduces bit walking and lowers feed pressure on entry
• Web-thinned, parallel web configuration improves chip flow and reduces heat buildup
• Screw machine (stub) length provides added rigidity and minimizes deflection
• Right-hand spiral flute with straight cylindrical shank for universal chuck compatibility

Compatibility

Designed as a screw machine length drill bit with a straight cylindrical shank, compatible with standard three-jaw chucks and collet tool holders on drill presses, milling machines, and CNC machining centers accepting bits in the 0.3500 to 0.4000 inches decimal diameter range.

Installation Notes

Installation should be performed by qualified machinists or maintenance tradespeople familiar with rotating cutting tools. Secure the shank fully into the chuck or collet before operation and confirm the bit is centered and locked before applying power. Always wear appropriate eye protection and ensure workpieces are firmly clamped. Follow applicable OSHA machine guarding and tooling standards when operating drill presses or CNC equipment.