Precision Twist Drill 5998676 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998676 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Manufactured from high speed steel with a coated finish, this bit measures 0.201 inches (Wire Size #7) in diameter with an overall length of 2.25 inches and a flute length of 1.1875 inches. The 135-degree split point reduces walking on entry and requires no center punch on most surfaces. The web-thinned, tapered web construction improves chip evacuation and reduces thrust during cut. Right-hand spiral flutes and a straight cylindrical shank make this bit compatible with standard drill chucks and screw machine setups.

This bit is rated for primary workpiece material of titanium, making it suitable for aerospace, HVAC fabrication, and precision mechanical assembly work where titanium fasteners or structural components are common. The screw machine length format — shorter than a jobber-length bit — provides added rigidity and reduced deflection in drill press, turret lathe, and CNC screw machine operations. The Series R41C designation and NAS 907 specification compliance indicate suitability for critical-tolerance drilling in professional and industrial environments. Sold individually, with a minimum order quantity of 12 units.

Key Features

• 135-degree split point for accurate self-centering entry without center punching
• Web-thinned tapered web reduces axial thrust and improves chip flow
• High speed steel construction with coated finish for extended tool life
• Screw machine length (2.25 inches overall) provides rigidity and reduced deflection
• Right-hand spiral flute with 2.5xD flute-to-diameter ratio optimized for chip evacuation
• Meets ANSI and NAS 907 specifications for precision and heavy-duty drilling

Compatibility

Designed for use with standard straight-shank drill chucks in drill press, turret lathe, and CNC screw machine setups. Rated for titanium as the primary workpiece material and suitable for applications requiring ANSI and NAS 907 specification compliance. Fits drill chucks accepting straight cylindrical shanks in the 0.2000 to 0.2500 inch diameter range.

Installation Notes

Installation and operation should be performed by qualified machinists or trade professionals familiar with drill press and CNC screw machine procedures. Ensure the machine spindle is fully stopped and de-energized before inserting or removing the bit from the chuck. Secure the shank fully in the chuck jaws to the recommended depth before initiating a cut. Use appropriate cutting fluid or coolant for titanium workpieces to manage heat buildup and extend tool life.