Precision Twist Drill 5996503 Cobalt Drill Bit 0.29 in

Product Description

The PRECISION TWIST DRILL 5996503 is a screw machine length cobalt drill bit designed for drilling into hard and difficult-to-machine materials. Built to the M42CO series specification, it features a 135-degree split point that reduces walking at startup and lowers the thrust needed to penetrate tough workpieces. The straight-cylindrical shank fits standard drill chucks without adapters. At 0.29 inches in diameter (Letter L), it falls in the heavy-duty grade category and is web-thinned for improved chip clearance and cutting efficiency. This bit is manufactured to ANSI standards and is suited for production and maintenance drilling environments.

This drill bit is intended for use in screw machine operations, short-hole drilling, and production drilling applications where a stub-length tool is preferred for rigidity. It is well suited for drilling hard metals, alloy steels, stainless steel, and other materials that wear down standard high-speed steel tooling. The right-hand spiral flute configuration and coated cobalt construction make it a practical choice for machine shop technicians, industrial maintenance mechanics, and tool room personnel working on tight-tolerance applications.

Key Features

• M42 cobalt construction rated for high-performance drilling in hard and abrasion-resistant materials
• 135-degree split point reduces bit walking and cuts entry thrust requirements
• Web-thinned, tapered web design improves chip evacuation through the 1-9/16 inch flute length
• Screw machine (stub) length provides added rigidity compared to jobber-length bits
• Straight-cylindrical shank fits standard three-jaw chucks without additional adapters
• Right-hand cut with regular spiral flutes; ANSI specification compliant

Compatibility

Designed as an OEM-style replacement or direct production tooling option for applications requiring a 0.29 inch (Letter L) straight-shank screw machine length drill bit in the M42CO cobalt series.

Installation Notes

This drill bit is installed and operated by machining professionals and industrial maintenance technicians using drill presses, CNC machining centers, or hand-held power drills with compatible chuck sizes. Ensure the machine spindle and chuck are fully stopped before inserting or removing the bit. Confirm the shank is fully seated and the chuck is properly tightened before beginning any drilling operation. Always use appropriate cutting fluid or coolant for the workpiece material to extend tool life, and wear appropriate eye protection in compliance with applicable shop safety standards.