Precision Twist Drill 5998471 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998471 is a screw machine length drill bit designed for high-performance hole-making in demanding trade and industrial applications. Built from high speed steel with a coated finish, this bit measures 0.7813 inches (25/32 inch) in diameter with an overall length of 5-1/8 inches and a flute length of 3-1/4 inches. The 118-degree standard point angle and web-thinned, tapered web configuration reduce entry force and improve centering. It is suited for machinists, maintenance technicians, and fabricators who require consistent performance across a wide range of materials including titanium.

This drill bit fits into Series R40 from PRECISION TWIST DRILL, which targets high performance general purpose applications. The screw machine length profile — shorter than a jobber bit — provides added rigidity and reduced deflection, making it well-suited for drill press work, CNC setups, and manual machine operations where stub-length control is preferred. The straight-cylindrical shank seats securely in standard drill chucks and collet holders. It conforms to ANSI standards and is rated for use on workpiece materials including titanium, positioning it for both production and maintenance environments.

Key Features

• 0.7813 inch (25/32 inch) diameter with a screw machine length body for added rigidity over jobber bits
• High speed steel construction with coated finish for extended tool life
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust and improved chip clearance
• Regular spiral, spiral flute geometry at a 2.5xD flute-to-diameter ratio promotes efficient chip evacuation
• Right-hand cut with straight-cylindrical shank for compatibility with standard chucks and collets
• ANSI-compliant construction; rated for high performance use on titanium and similar demanding materials

Compatibility

Designed as an OEM-style replacement or direct-use screw machine length drill bit for general purpose and high performance drilling applications conforming to ANSI standards. Primary workpiece material rating includes titanium per Series R40 specifications.

Installation Notes

This drill bit is installed by machinists or maintenance technicians in drill press, lathe tailstock, or CNC machine tool holders. Secure the straight-cylindrical shank fully in the chuck or collet before operation to prevent slippage. Ensure the spindle and workpiece are properly fixtured before engaging the tool. Follow shop safety protocols and machine manufacturer guidelines for speeds and feeds appropriate to the workpiece material.