Precision Twist Drill 5998957 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998957 is a screw machine length drill bit designed for high-performance metal drilling in industrial and trade applications. Built from high speed steel with a bright, uncoated finish, it features a 118-degree standard point angle and a web-thinned, tapered web configuration that reduces entry resistance and improves chip evacuation. The straight-cylindrical shank seats securely in standard drill chucks. At 0.348 inches (letter size S) in diameter, this bit is engineered for right-hand cut spiral flute drilling and carries an overall length of 3-1/16 inches with a flute length of 1-3/4 inches. Machinists, maintenance technicians, and trade professionals install this bit for close-tolerance work in compact setups.

This Series R42 screw machine drill bit is suited for drilling titanium as its primary rated workpiece material, as well as general-purpose metal stock in production and maintenance environments. The shorter-than-jobber body length provides added rigidity in drill press, CNC, and hand-drill applications where reduced deflection matters. The 2.5xD flute-to-diameter ratio supports consistent chip clearing in moderate-depth holes. It is sold individually and meets ANSI standards for dimensional accuracy.

Key Features

• 0.348 inch diameter, letter size S, within the 0.3000 to 0.3500 inch range
• High speed steel construction rated for high-performance cutting in titanium and general metals
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust force
• Screw machine length body at 3-1/16 inches overall for added rigidity and precision in tight applications
• Right-hand cut, spiral flute, straight-cylindrical shank for universal chuck compatibility
• Meets ANSI dimensional standards; Series R42

Compatibility

Designed as a screw machine length replacement or production drill bit for use in standard drill chucks and collets accepting a straight-cylindrical shank of 0.348 inch diameter; rated for titanium as the primary workpiece material per ANSI Series R42 specifications.

Installation Notes

This bit is installed by machinists and maintenance professionals in drill presses, CNC lathes, and hand-held power drills. Secure the straight-cylindrical shank fully in the chuck before operation and verify chuck key is removed before starting the spindle. Use appropriate cutting fluid or coolant when drilling titanium or hard metals to extend tool life. Inspect the cutting edges and point geometry before each use; a chipped or dull point increases thrust force and can cause workpiece damage or bit breakage.