Precision Twist Drill 5998642 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998642 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 with web thinning for fast starts and reduced thrust. The straight-cylindrical shank measures 0.055 inches in diameter, matching the drill diameter, and the overall length is 1-5/8 inches with a 5/8-inch flute length. The compact screw machine length geometry makes it well suited for tight-clearance work and close-tolerance drilling on manual or CNC equipment.

This drill bit is rated for primary use on titanium and other high-performance workpiece materials, making it a practical choice for machinists, maintenance technicians, and precision fabricators. The R41C series designation, NAS 907 specification number, and ANSI compliance indicate this bit is built to recognized dimensional and performance standards. The 2.5xD flute-to-diameter ratio and tapered web configuration help evacuate chips efficiently during short, deep passes typical of screw machine setups.

Key Features

• Wire gauge size 54 (0.055 inches) straight-cylindrical shank for standard chuck compatibility
• 135-degree drill point angle with web-thinned, tapered web for reduced entry force and accurate starts
• High speed steel construction with coated finish for increased surface hardness and wear resistance
• Right-hand cut, regular spiral flute for efficient chip evacuation in short-length drilling
• Screw machine length (1-5/8 inches overall) provides rigidity in confined workspaces
• Meets ANSI and NAS 907 specifications for dimensional accuracy and heavy-duty grade performance

Compatibility

Designed as an OEM-compatible screw machine length drill bit suitable for use in standard drill chucks, CNC machining centers, and manual drill presses that accept straight-cylindrical shanks at 0.055 inches diameter.

Installation Notes

This bit is installed by machinists or maintenance technicians into compatible drill chucks or collet holders. Ensure the machine is powered down and the spindle is fully stopped before changing bits. Secure the shank fully in the chuck to the recommended grip depth to prevent slippage and bit breakage. When drilling titanium or hard alloys, use appropriate cutting fluid and controlled feed rates to protect the cutting edge and extend bit life.