Precision Twist Drill 5998974 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998974 is a screw machine length drill bit designed for high-performance drilling in metal fabrication and machining applications. Manufactured from high speed steel (HSS) with a bright/uncoated finish, this bit measures 0.413 inches in diameter and carries a standard 118-degree point angle. The straight-cylindrical shank seats securely in standard drill chucks, and the web-thinned, tapered web construction reduces thrust requirements at the cutting edge. Right-hand spiral flute geometry clears chips efficiently during drilling cycles. This bit meets ANSI standards and is rated for general purpose use with high performance output on demanding materials.

This bit is suited for use in screw machine operations, production drilling, and bench drilling setups found in machine shops, fabrication facilities, and maintenance environments. The Series R42 designation and 2.5xD flute-to-diameter ratio make it well matched for short-hole drilling in ferrous and non-ferrous metals. The primary workpiece material rating includes titanium, indicating the HSS construction and web-thinned geometry are appropriate for tougher alloys where point integrity and chip evacuation matter. Machinists, tool and die technicians, and industrial maintenance professionals are the typical installers.

Key Features

• 0.413 inch diameter, size Z designation per ANSI standards
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust
• High speed steel construction, bright/uncoated finish
• Right-hand cut with regular spiral flute geometry for efficient chip clearing
• Screw machine length profile: 3.375 inches overall length, 2-inch flute length
• Series R42 high performance rating; rated for titanium and similar demanding workpiece materials

Compatibility

Designed as a screw machine length replacement drill bit for use in standard drill chucks accepting a straight-cylindrical shank in the 0.400 to 0.450 inch diameter range, conforming to ANSI specifications.

Installation Notes

Installation is performed by machinists or tool and die technicians in machine shop or production drilling environments. Ensure the drill press, screw machine, or CNC spindle is fully powered down and the chuck is clear before seating or removing the bit. Confirm the straight-cylindrical shank is fully seated and the chuck is tightened evenly before operation. Follow applicable shop safety procedures and machine manufacturer guidelines for spindle speed and feed rate selection based on workpiece material.