Precision Twist Drill 5996019 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996019 is a cobalt screw machine length drill bit designed for drilling into hard and abrasive workpiece materials where standard high-speed steel bits fall short. It measures 0.1406 inches (9/64 inches) in diameter with an overall length of 1-15/16 inches and a flute length of 15/16 inches. The 135-degree split point reduces walking on entry and lowers thrust requirements, making it well suited for production drilling and tight-tolerance work. The right-hand spiral flute with web-thinned, tapered web geometry promotes efficient chip evacuation. At 0.04167 pounds, this is a compact, single-piece bit built to ANSI standards for consistent dimensional accuracy.

This bit is intended for use in screw machine operations, CNC drill presses, hand-held power drills, and bench drill press applications where a short, rigid cutting length is required to minimize deflection. The M40CO series cobalt grade is a common choice for machinists, maintenance technicians, and fabricators working with stainless steel, hardened alloys, cast iron, and other hard materials that generate significant heat at the cutting edge. The 2.5xD flute-to-diameter ratio keeps the tool stiff in short-reach applications typical of screw machine and production-line drilling cycles.

Key Features

• Cobalt M40CO grade construction for heat resistance in hard-material drilling
• 135-degree split point reduces walking and lowers entry thrust
• Web-thinned, tapered web geometry improves chip flow and reduces torque
• Screw machine (stub) length provides maximum rigidity and minimizes deflection
• Right-hand cut with regular spiral flute for standard drilling operations
• Built to ANSI specification for dimensional consistency

Compatibility

Designed as an OEM-style replacement or direct-use drill bit compatible with standard straight-shank drill chucks accepting a 0.1406-inch diameter bit in screw machine length format.

Installation Notes

Installation is performed by machinists or maintenance technicians using a drill press, CNC machine, or hand-held power drill equipped with a compatible straight-shank chuck. Secure the shank firmly in the chuck before operation and verify chuck runout is within acceptable tolerance to protect the small-diameter bit from breakage. Always reduce feed rate when breaking through the back side of the workpiece. Use appropriate cutting fluid or coolant for hard-material applications to extend tool life, noting that this bit does not support internal coolant-through delivery.