Precision Twist Drill 5999452 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999452 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from high speed steel (HSS) with a coated finish, this bit measures 0.1406 inches (9/64 inch) in diameter with an overall length of 1-15/16 inches and a flute length of 15/16 inches. The 135-degree split point reduces walking on entry and minimizes thrust force, while the web-thinned, tapered web construction improves chip evacuation. Machinists, tool-and-die workers, and mechanical contractors working on precision assemblies will find this bit suited for close-tolerance work.

The 5999452 is rated for drilling titanium as its primary workpiece material, making it appropriate for aerospace component work, heavy equipment repair, and precision fabrication environments where standard bits fall short. The screw machine length profile provides added rigidity versus jobber-length bits, which is especially useful in drill press, CNC, and turret lathe setups where minimizing deflection matters. The regular spiral flute geometry and 2.5xD flute-to-diameter ratio support consistent chip clearance during through-hole operations.

Key Features

• 0.1406 inch (9/64 inch) diameter with screw machine length for maximum rigidity
• 135-degree split point reduces thrust and eliminates center-punch requirements on most metals
• Web-thinned, tapered web construction improves chip flow and reduces heat buildup
• High speed steel construction with coated finish for extended tool life on hard materials
• Right-hand cut, straight-cylindrical shank fits standard drill chucks and collet holders
• Meets ANSI and NAS 907 standards; Series R40C heavy duty grade

Compatibility

Designed for use with standard drill presses, CNC machining centers, turret lathes, and hand-held power drills accepting straight-cylindrical shanks. Rated for titanium as primary workpiece material; also suitable for other metals within the 0.1000 to 0.1500 inch drill bit size range covered by Series R40C.

Installation Notes

Install and remove drill bits only when the machine is fully powered down and the spindle has stopped. Secure the straight-cylindrical shank firmly in a properly sized chuck or collet to prevent slippage and bit breakage at this small diameter. Use appropriate cutting fluid or coolant when drilling titanium or hardened metals to manage heat and extend bit life. Dispose of worn or chipped bits according to your shop's sharps and metal waste procedures.