Precision Twist Drill 5999038 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999038 is a screw machine length drill bit designed for high-performance metal cutting in demanding shop and field applications. It measures 0.368 inches in diameter, letter size U, with an overall length of 3-1/8 inches and a flute length of 1-13/16 inches. Constructed from high speed steel with a coated finish, this bit features a 135-degree split point for fast, accurate starts with minimal walking. A web-thinned, tapered web configuration reduces thrust and improves chip evacuation. This is a heavy-duty grade tool built to ANSI and NAS 907 standards.

The 5999038 is rated for primary use in titanium workpieces, making it a strong choice for aerospace, precision machining, and industrial maintenance applications where tough alloys are common. The screw machine length profile keeps the bit rigid and reduces deflection in close-clearance drilling operations. The 2.5xD flute-to-diameter ratio supports consistent chip flow in short-stroke drill press and CNC setups. It is a single-piece, individually packaged bit suited for tool crib stock or bench use by machinists and maintenance technicians.

Key Features

• 0.368 inch diameter, letter size U, screw machine length for rigid, low-deflection drilling
• 135-degree split point with web thinning for fast penetration and reduced thrust
• High speed steel construction with coated finish for extended tool life
• Right-hand spiral flute with 2.5xD ratio for efficient chip evacuation
• Tapered web configuration reduces cutting resistance in hard materials
• Meets ANSI and NAS 907 standards for dimensional and performance compliance

Compatibility

Designed as a heavy-duty OEM-style replacement or direct-use screw machine drill bit for applications involving titanium and similar hard alloys, conforming to ANSI and NAS 907 specification requirements.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with metal cutting operations. Secure the shank fully in the drill chuck or collet before operation and verify proper alignment. Power down and lock out all equipment before changing or inspecting bits. Follow applicable shop safety standards and manufacturer speed-and-feed recommendations for the workpiece material.