Precision Twist Drill 5998630 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998630 is a screw machine length high speed steel drill bit designed for precision hole-making in tight-tolerance applications. Measuring 0.0635 inches in diameter with a 135-degree split point, this bit delivers fast starts without center punching and reduces walking on hard or slippery surfaces. The web-thinned, tapered web construction lowers thrust force during entry. At 1-11/16 inches overall length with an 11/16-inch flute length, it is built for stub-length drilling in fixtures, jigs, and automated equipment. Installed by machinists, tool-and-die technicians, and production drilling operators.

This drill bit is rated for high-performance applications and carries a primary workpiece material designation of titanium, making it suitable for demanding aerospace, medical, and industrial production environments. The straight-cylindrical shank seats in standard drill chucks and collet holders without modification. The regular spiral flute geometry promotes consistent chip evacuation at production feed rates. It conforms to ANSI and NAS 907 standards and is classified as a heavy duty grade bit in the Series R41C lineup.

Key Features

• 135-degree split point with web thinning for self-starting entry and reduced thrust
• High speed steel construction with coated finish for extended tool life
• Screw machine (stub) length at 1-11/16 inches overall for rigid, low-deflection drilling
• Right-hand cut with regular spiral flute geometry for reliable chip clearance
• Straight-cylindrical shank compatible with standard chucks and collet systems
• Meets ANSI and NAS 907 specifications for dimensional and performance compliance

Compatibility

Designed for use in standard drill chucks and collet holders accepting a straight-cylindrical shank; rated for drilling titanium and similarly demanding workpiece materials in production and precision machining applications.

Installation Notes

Install into a properly sized drill chuck or collet and verify runout before production drilling. Power down and lock out the machine spindle before changing or inspecting bits. Use appropriate cutting fluid or coolant for the workpiece material even though this bit does not have through-coolant capability. Inspect the cutting edges and web for wear or chipping at regular intervals, particularly when drilling abrasive or work-hardening alloys.