Precision Twist Drill 5998609 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998609 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned geometry that reduces walking and cutting force at the start of each hole. The 0.182 inch (wire size 14) diameter and shortened screw machine length make it well suited for work in tight clearances and on drill press fixtures where standard jobber-length bits are impractical. Licensed HVAC, plumbing, and mechanical trades as well as machinists and fabricators will find this bit in regular rotation for sheet metal, structural, and component drilling tasks.

This bit is rated for primary use on titanium workpieces, making it appropriate for high-performance mechanical and aerospace-adjacent fabrication work. The R41C series designation identifies it within Precision Twist Drill's heavy duty line, built to ANSI and NAS 907 specification standards. The spiral flute configuration with a 2.5xD flute-to-diameter ratio provides efficient chip evacuation during extended drilling cycles. The straight-cylindrical shank seats cleanly in standard three-jaw chucks and quick-change systems without modification.

Key Features

• 0.182 inch diameter, wire size 14, screw machine (stub) length for close-quarters drilling
• 135-degree split point with web thinning reduces thrust and minimizes bit walking on hard materials
• High speed steel construction with coated finish for improved wear resistance
• Right-hand spiral flute with 2.5xD ratio for efficient chip evacuation
• Tapered web configuration adds rigidity through the cutting zone
• Built to ANSI and NAS 907 standards — heavy duty, high performance grade

Compatibility

Designed as an OEM-style replacement and standard fitment screw machine drill bit for use in any three-jaw chuck or quick-change holder accepting a straight-cylindrical shank. Rated for drilling titanium as the primary workpiece material; also suitable for other ferrous and non-ferrous metals consistent with high speed steel tooling.

Installation Notes

Installed by machinists, pipefitters, and mechanical trade professionals using drill presses, CNC machines, or hand-held power drills with a compatible chuck. Secure the straight-cylindrical shank firmly in the chuck before operating to prevent slippage under load. Always wear appropriate eye protection and follow shop-floor safety protocols when drilling titanium or hardened materials. Replace the bit if the cutting edges show signs of chipping, excessive heat discoloration, or loss of point geometry.