Precision Twist Drill 5998697 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998697 is a screw machine length drill bit engineered for high-performance drilling in demanding trade and industrial applications. Manufactured from high speed steel with a coated finish, this bit features a 135-degree split point and a web-thinned, tapered web configuration that reduces walking and improves penetration. At 0.147 inches in diameter with a straight-cylindrical shank, it is designed for use in standard drill chucks and CNC machines. The regular spiral flute with a 2.5xD flute-to-diameter ratio promotes efficient chip evacuation. Rated as a heavy duty bit, it meets ANSI and NAS 907 specifications.

This bit is optimized for drilling titanium as its primary workpiece material, making it well suited for aerospace, mechanical, and precision machining environments where titanium fastener holes and component bores are required. The screw machine length format — shorter than jobber length — provides greater rigidity and stability in tight clearance applications and machine tool setups. The overall length of 2-1/16 inches and 1-inch flute length make it a practical choice for short-reach drilling operations on manual drill presses, lathes, and CNC machining centers. Each package contains one bit. Minimum order quantity is 12 units.

Key Features

• 0.147 inch diameter, wire size No. 26
• 135-degree split point reduces thrust and minimizes bit walking on entry
• Web-thinned tapered web enhances penetration in hard materials including titanium
• High speed steel construction with coated finish for extended tool life
• Screw machine length design provides increased rigidity over jobber-length bits
• Meets ANSI and NAS 907 specifications for precision and consistency
• Right hand cut, regular spiral flute with 2.5xD flute-to-diameter ratio for efficient chip removal

Compatibility

Designed as a heavy duty OEM-style replacement or new-install drill bit for use in standard straight-shank drill chucks compatible with 0.147 inch diameter tooling. Primary workpiece material is titanium per Series R41C specifications.

Installation Notes

This bit is intended for installation and use by machinists and trade professionals familiar with drill press, lathe, or CNC machine operation. Ensure the machine spindle is fully stopped and locked out before changing or securing bits in the chuck. Use appropriate cutting fluid or coolant when drilling titanium to manage heat buildup and extend tool life. Note that this bit does not support coolant-through application.