Precision Twist Drill 5998595 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998595 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 and web-thinned, tapered web construction that reduces walking and improves penetration on entry. The straight-cylindrical shank measures 0.228 inches in diameter, and the overall length is 2-7/16 inches with a flute length of 1-5/16 inches. It is rated for heavy-duty use and meets ANSI and NAS 907 specifications. Licensed machinists, tool-and-die techs, and maintenance professionals reach for this bit when precision and durability matter.

The 5998595 is engineered for right-hand spiral flute cutting with a 2.5xD flute-to-diameter ratio, making it well suited for drilling titanium and other difficult primary workpiece materials. Its screw machine length profile — shorter than jobber length — provides added rigidity in tight-clearance setups, turret lathes, CNC machining centers, and drill press fixtures where chatter and deflection must be minimized. The Series R41C designation places it within a recognized high-performance product family conforming to ANSI standards.

Key Features

• 0.228 inch (wire size #1) diameter, screw machine length for added rigidity
• 135-degree split point with web thinning reduces thrust and prevents walking
• High speed steel construction with coated finish for extended tool life
• Right-hand cut, regular spiral flute for efficient chip evacuation
• Meets ANSI and NAS 907 specifications — heavy-duty grade
• Straight-cylindrical shank compatible with standard drill chucks and collets

Compatibility

Designed as a heavy-duty screw machine length drill bit for use with standard drill chucks and collets accepting a straight-cylindrical shank; rated for titanium and other demanding workpiece materials per Series R41C and NAS 907 specification requirements.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or maintenance professionals familiar with proper speeds and feeds for the workpiece material. Secure the shank fully in the chuck or collet before operation and ensure the machine spindle is completely stopped before bit changes. Follow shop safety protocols and applicable ANSI machining standards when setting up drilling operations. Coolant-through is not supported on this bit, so external coolant or cutting fluid application should be used as appropriate for the material.