Precision Twist Drill 5998259 Jobber Drill Bit 25/64

Product Description

The PRECISION TWIST DRILL 5998259 is a jobber-length twist drill bit designed for general-purpose drilling in metal and hard materials. It features a 25/64-inch (0.3906 inch) diameter, a 118-degree standard point angle, and a two-flute right-hand spiral configuration. The bit is machined from high-speed steel with a bright uncoated finish and a web-thinned, tapered-web design that reduces thrust and improves chip evacuation. Overall length is 5.125 inches with a 3.75-inch flute length. Licensed HVAC technicians, machinists, plumbers, and electricians reach for this size when drilling pilot holes, clearance holes, or anchor holes in ferrous and non-ferrous stock.

This drill bit is suited for drilling into steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It belongs to the R10P-R15P-R18P series and carries an ANSI specification designation. The straight-cylindrical shank diameter matches the bit diameter at 0.3906 inches, fitting standard three-jaw chucks on drill presses, hand drills, and magnetic drills. The 10xD flute-to-diameter ratio provides adequate flute length for most jobber-depth holes encountered in trade service work, sheet metal fabrication, and mechanical installation tasks.

Key Features

• 25/64-inch (0.3906 inch) diameter with matching straight-cylindrical shank for secure chuck engagement
• 118-degree standard point angle with web-thinned, tapered-web geometry for reduced entry thrust
• High-speed steel construction handles steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Right-hand cut, regular-spiral two-flute design promotes consistent chip clearing
• Bright uncoated finish allows easy visual inspection of cutting edge condition
• ANSI-compliant jobber-length geometry fits standard drill indexes and replacement charts

Compatibility

Designed as an ANSI-standard jobber-length drill bit compatible with any three-jaw chuck or drill index accepting a 25/64-inch straight-cylindrical shank. Suitable for use in drill presses, corded and cordless hand drills, and magnetic base drills across trade and light industrial applications.

Installation Notes

Installation should be performed by a qualified tradesperson following standard safe-drilling practices. Secure the workpiece before drilling and ensure the shank is fully seated and tightened in the chuck before operation. Use appropriate cutting fluid or coolant when drilling stainless steel, cast iron, or titanium to extend cutting edge life. Inspect the cutting edges before each use and replace the bit if chipping or burning is observed.