Precision Twist Drill 5999425 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999425 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from coated high speed steel, this bit features a 135-degree split point and web-thinned, tapered web construction that reduces walking and cutting resistance on entry. The straight-cylindrical shank and right-hand spiral flute geometry deliver clean, consistent chip evacuation. At 15/64 inch (0.2344 inches) in diameter with an overall length of 2-7/16 inches and a flute length of 1-5/16 inches, it is sized for stub-length drilling where rigidity and precision matter. This bit is rated for heavy-duty use and meets ANSI and NAS 907 standards.

This drill bit is suited for machining and fabrication environments where shorter bit length improves rigidity and reduces deflection. Its primary workpiece material rating is titanium, making it appropriate for aerospace, defense, and precision manufacturing applications where harder alloys are common. The R40C series designation indicates it belongs to PRECISION TWIST DRILL's high-performance stub-length line. It is installed and used by machinists, tool-and-die professionals, and maintenance technicians working on CNC machines, drill presses, and hand drill applications requiring tight tolerances.

Key Features

• 15/64 inch (0.2344 inches) diameter screw machine length bit for high-rigidity short-reach drilling
• 135-degree split point with web thinning reduces entry force and minimizes bit walking
• Coated high speed steel construction rated for heavy-duty use including titanium workpieces
• Right-hand cut with regular spiral flute for consistent chip evacuation
• Meets ANSI and NAS 907 specifications for dimensional and performance standards
• Straight-cylindrical shank compatible with standard drill chucks and collets

Compatibility

Designed as a screw machine length replacement or stock drill bit for use in standard drill chucks and collets accepting a straight-cylindrical shank in the 0.2000 to 0.2500 inch diameter range.

Installation Notes

This bit is installed by machinists and maintenance technicians in drill presses, CNC machines, or hand drills with compatible chuck capacity. Ensure the machine is fully powered down and locked out before changing bits. Secure the shank fully in the chuck or collet to the recommended engagement depth before operation. Do not exceed the rated speed for the workpiece material being drilled.