Precision Twist Drill 5998694 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998694 is a screw machine length high speed steel drill bit designed for precision drilling in demanding trade and industrial applications. Measuring 0.1495 inches in diameter with a 135-degree split point, this bit delivers accurate starts and reduced walking on entry. The web-thinned, tapered web construction lowers cutting resistance and extends tool life under heavy-duty use. At 2.0625 inches overall length with a 1-inch spiral flute, the compact screw machine geometry suits close-quarters drilling where standard-length bits cannot reach. A straight-cylindrical shank allows direct chucking in standard drill chucks and machine spindles.

This bit is rated for high-performance drilling in titanium as its primary workpiece material, making it well suited for aerospace, HVAC equipment fabrication, and mechanical trades where titanium fastener holes or component bores are required. The coated finish reduces friction and heat buildup during cuts. Right-hand spiral flutes evacuate chips efficiently, keeping the cut clean. It meets ANSI and NAS 907 standards and carries a heavy-duty grade designation within the R41C series.

Key Features

• 135-degree split point for self-centering entry and reduced thrust force
• Web-thinned tapered web lowers cutting resistance on hard materials including titanium
• Screw machine length at 2.0625 inches overall for use in tight clearance applications
• High speed steel construction with coated finish for extended tool life
• Right-hand cut with regular spiral flutes at 2.5xD flute-to-diameter ratio for efficient chip evacuation
• Meets ANSI and NAS 907 specification standards

Compatibility

Designed as a heavy-duty screw machine length replacement bit in wire size number 25 (0.1495 inches decimal), compatible with standard straight-cylindrical shank drill chucks and machine spindles accepting that shank diameter. Fits within the R41C series range of 0.1000 to 0.1500 inches.

Installation Notes

Machinists and drill press operators should secure the straight-cylindrical shank firmly in a properly sized chuck before operation. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. When drilling titanium or other hard materials, use appropriate cutting fluid or coolant to manage heat, and operate at speeds and feeds appropriate for the workpiece material and bit diameter. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.