Precision Twist Drill 5998626 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998626 is a screw machine length drill bit designed for high-performance drilling in tight-tolerance applications. Built from high speed steel with a coated finish, this bit features a 135-degree split point and a web-thinned, tapered web configuration that reduces thrust and improves centering on entry. It measures 0.067 inches in diameter with an overall length of 1-11/16 inches and a flute length of 11/16 inches. The straight-cylindrical shank seats securely in standard chucks. Licensed HVAC techs, machinists, pipefitters, and industrial maintenance tradespeople rely on this series for precision hole-making in challenging materials.

The 5998626 is rated for primary use in titanium and is built to heavy duty grade standards, making it suitable for demanding production and maintenance environments. The R41C series follows ANSI and NAS 907 specifications, confirming dimensional and performance compliance for aerospace and industrial applications. The 2.5xD flute-to-diameter ratio supports chip evacuation in short, controlled cuts typical of screw machine work. This bit is sold individually and is intended for use in drill presses, CNC machines, and hand-held power drills where precision entry and clean hole geometry are required.

Key Features

• 135-degree split point reduces walking and lowers entry thrust
• Web-thinned, tapered web improves chip flow and reduces heat buildup
• High speed steel construction with coated finish for extended tool life
• Screw machine length (1-11/16 inches overall) provides rigidity in short-reach applications
• Right-hand spiral flute with 2.5xD ratio supports efficient chip evacuation
• Meets ANSI and NAS 907 specifications for dimensional and performance compliance

Compatibility

Designed as an OEM-style replacement and standard production drill bit for use in drill presses, CNC machining centers, and power drills accepting straight-cylindrical shank tooling in the 0.067-inch diameter range.

Installation Notes

This bit is installed by machinists, maintenance technicians, and tradespeople using standard drill chucks or collet systems. Confirm the chuck or collet is rated for the straight-cylindrical shank diameter before seating the bit. When drilling titanium or other hard materials, use appropriate cutting fluid and controlled feed rates to prevent work hardening and premature tool wear. Never exceed the rated RPM for the bit diameter and material combination.