Precision Twist Drill 5996646 Cobalt Drill Bit 0.246in

Product Description

The PRECISION TWIST DRILL 5996646 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and difficult-to-machine materials. Built to the M42 cobalt steel material grade and conforming to ANSI standards, this bit delivers the heat resistance and edge retention needed for demanding production environments. The 135-degree split point reduces walking and allows for faster penetration without a center punch. At 0.246 inches in diameter with a 2.5 inches overall length and 1.375 inches flute length, this is a compact, rigid bit suited for close-tolerance stub-length drilling. Machinists, toolmakers, and maintenance technicians working with hardened steels, stainless, and high-alloy materials reach for this grade when standard HSS bits fall short.

This bit is intended for screw machine length applications where reduced tool overhang improves rigidity and hole accuracy. The straight-cylindrical shank fits standard drill chucks on drill presses, CNC machining centers, and screw machines. The regular spiral flute geometry and web-thinned, tapered web construction promote chip evacuation and reduce thrust load. It is well suited for drilling hard materials including alloy steels, stainless steel, and other tough workpiece materials in shop, maintenance, or production settings.

Key Features

• M42 cobalt construction provides superior heat resistance over standard HSS for hard-material drilling
• 135-degree split point reduces thrust and eliminates center-punch requirement on most surfaces
• Screw machine (stub) length design increases rigidity and reduces deflection in tight setups
• Web-thinned tapered web lowers cutting resistance and improves chip flow
• Right-hand cut, regular spiral flute with 2.5xD flute-to-diameter ratio for efficient chip evacuation
• ANSI-conforming dimensions ensure interchangeability with standard toolholding systems

Compatibility

Designed as an OEM-style screw machine length drill bit in the M42CO series, compatible with standard straight-shank drill chucks and collet systems accepting 0.246-inch shank diameters.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tool safety. Ensure the drill chuck or collet is fully tightened and the workpiece is securely clamped before starting the spindle. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting this bit does not have a coolant-through feature. Inspect the cutting edges for chipping or wear before each use and replace the bit if edge integrity is compromised.