Precision Twist Drill 5999367 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999367 is a screw machine length drill bit designed for high-performance metal drilling in demanding shop and production environments. Built from high speed steel with a coated finish, this bit features a 135-degree split point that reduces walking and decreases the thrust required to start a hole. At 0.261 inches in diameter (Letter G), it belongs to the R42C series and is engineered with a web-thinned, tapered web construction for improved chip evacuation and cutting efficiency. Licensed machinists, tool-and-die technicians, and production drilling operators are the primary users of this bit.

This drill bit is rated for use on titanium as its primary workpiece material, making it appropriate for aerospace, medical, and high-alloy fabrication applications where conventional bits fall short. The screw machine length (stub) format provides added rigidity compared to jobber-length bits, reducing deflection in short-reach drilling operations on drill presses, CNC machining centers, and manual lathes. The straight-cylindrical shank fits standard chucks without adapters. The 2.5xD flute-to-diameter ratio supports controlled chip flow in tough materials.

Key Features

• 135-degree split point reduces drill walking and lowers thrust requirements at entry
• Web-thinned, tapered web construction improves chip clearance in high-resistance materials
• High speed steel construction with coated finish for extended tool life
• Screw machine (stub) length provides greater rigidity and reduced deflection versus jobber bits
• Right-hand spiral flute with regular spiral geometry for consistent chip evacuation
• Meets ANSI and NAS 907 standards for heavy duty drilling applications

Compatibility

Designed for use on titanium as the primary workpiece material and compatible with standard drill chucks and collets accepting a straight-cylindrical shank. Suitable for use in CNC machining centers, drill presses, and manual lathes where screw machine length tooling is specified.

Installation Notes

Install this bit in a properly sized chuck or collet, ensuring the shank is fully seated and securely tightened before operation. Always power down and lock out the machine before changing tooling per applicable OSHA lockout/tagout procedures. Use appropriate cutting fluid or coolant compatible with titanium and high speed steel tooling to manage heat buildup during extended drilling cycles. Inspect the cutting edges for wear or chipping before each use and replace the bit if the split point or flute geometry shows signs of degradation.