Precision Twist Drill 5999429 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999429 is a screw machine length drill bit engineered for high-performance metal drilling applications. Built from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned, tapered web configuration for fast penetration and reduced walking on entry. At 19/64 inch (0.2969 inch) diameter with an overall length of 2-3/4 inches and a flute length of 1-9/16 inches, it fits standard drill chucks with a straight-cylindrical shank. The R40C series designation and heavy-duty grade make it a reliable choice for machinists, tool-and-die techs, and maintenance professionals who need consistent results in tight tolerances.

This drill bit is designed for use in screw machine operations, CNC drilling, and production-environment setups where stub-length rigidity reduces deflection. The primary workpiece material rating is titanium, making it suitable for demanding aerospace, industrial, and mechanical applications. The 2.5xD flute-to-diameter ratio balances chip evacuation with bit stiffness. It is sold individually and is appropriate for bench drill presses, turret lathes, and handheld drill motors wherever a short, stiff bit is required.

Key Features

• 19/64 inch (0.2969 inch) diameter, screw machine (stub) length for maximum rigidity
• 135-degree split point with web thinning reduces thrust force and eliminates center-punch requirements
• High speed steel construction with coated finish for extended tool life
• Right-hand spiral flute geometry promotes consistent chip removal
• Straight-cylindrical shank compatible with standard drill chucks
• Meets ANSI and NAS 907 specifications for dimensional and performance compliance

Compatibility

Rated for drilling titanium as the primary workpiece material; also suitable for general-purpose drilling in ferrous and non-ferrous metals. Fits any drill chuck accepting a straight-cylindrical shank within the 0.2500 to 0.3000 inch bit size range.

Installation Notes

This bit is installed by a machinist or maintenance technician into a keyed or keyless drill chuck. Ensure the drill press, lathe, or motor is fully de-energized and the chuck is secure before beginning work. Use appropriate cutting fluid for titanium or hardened steel applications to manage heat buildup and extend bit life. Follow applicable ANSI B11 machine tool safety standards when operating drilling equipment.