Precision Twist Drill 5998547 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998547 is a screw machine length drill bit designed for high-performance metal cutting in demanding shop and field applications. It measures 0.1285 inches in diameter (Wire Size 30) with an overall length of 1-15/16 inches and a flute length of 15/16 inch. The bit is manufactured from high speed steel with a coated finish and features a split point at 135 degrees with web thinning for easier penetration and reduced walking on entry. The tapered web configuration and 2.5xD flute-to-diameter ratio support efficient chip evacuation. This is a right-hand cut, spiral flute design on a straight-cylindrical shank, rated for heavy-duty use by machinists and tool-room technicians.

This screw machine length drill bit is built for titanium as its primary workpiece material, making it well suited for aerospace, medical, and precision machining environments where titanium alloys are common. The shorter screw machine length body provides added rigidity compared to jobber length bits, reducing deflection in tight setups and CNC drilling applications. It conforms to ANSI and NAS 907 specifications, meeting the dimensional and performance standards required for controlled manufacturing processes. Machinists, tool-and-die makers, and maintenance technicians working with titanium or similar hard metals will find the Series R41C construction appropriate for production drilling operations.

Key Features

• 0.1285 inch diameter, Wire Size 30, screw machine length for added rigidity
• High speed steel construction with coated finish for extended tool life
• 135-degree split point with web thinning reduces thrust and prevents walking
• Tapered web configuration supports chip flow and heat dissipation
• 2.5xD flute-to-diameter ratio optimized for titanium and hard metal cutting
• Meets ANSI and NAS 907 specifications, Series R41C, heavy-duty grade

Compatibility

Rated for primary use in titanium workpiece materials; suitable for use in standard drill chucks and CNC spindles accepting straight-cylindrical shanks in the 0.1000 to 0.1500 inch diameter range per ANSI and NAS 907 specifications.

Installation Notes

Installation and use should be performed by qualified machinists or tool-room technicians familiar with proper drill press or CNC setup procedures. Secure the straight-cylindrical shank firmly in a compatible chuck before operation and verify runout before beginning a cut. Cutting speed and feed rate should be set according to the workpiece material and machine manufacturer guidelines. Coolant through is not supported on this bit; apply cutting fluid externally when machining titanium to manage heat buildup.