Precision Twist Drill 5998670 Drill Bit Letter F Hss

Product Description

The PRECISION TWIST DRILL 5998670 is a jobber length drill bit sized to letter F, equivalent to 0.2570 inches in diameter. Built from high speed steel with a steam oxide coating, it is designed for general-purpose drilling in metal fabrication, maintenance, and industrial service applications. The 118-degree standard point angle and web-thinned, tapered web design allow for efficient penetration and reduced thrust. Two spiral flutes with a regular spiral type clear chips effectively during through-hole and blind-hole drilling. Licensed tradespeople and machinists working in metal shops, HVAC fabrication, and mechanical service environments are the primary installers of this tool.

This drill bit is suited for drilling into steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. With an overall length of 4.125 inches and a flute length of 2.875 inches, it handles typical jobber-depth holes in both hand-held and drill press applications. The straight-cylindrical shank with a diameter of 0.2570 inches fits standard three-jaw chucks. It complies with ANSI standards and meets NAS 907 specification requirements, making it appropriate for aerospace and precision manufacturing environments.

Key Features

• Letter F size at 0.2570 inches diameter for precise hole sizing
• 118-degree standard point angle with web-thinned, tapered web for reduced entry force
• Steam oxide coating provides mild lubricity and corrosion resistance during use
• Two spiral flutes with regular spiral type promote efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• Meets ANSI standards and NAS 907 specification for precision and aerospace applications

Compatibility

Designed for use in standard three-jaw chucks on handheld drills, drill presses, and CNC drilling equipment. Compatible workpiece materials include steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. Part of the R10A, R15A, and R18A series.

Installation Notes

Secure the straight-cylindrical shank firmly in the drill chuck before use and confirm the bit is centered and running true before contact with the workpiece. Use appropriate cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to extend tool life. Note that this bit does not support coolant-through operation. Follow applicable shop safety practices including eye protection and workpiece securing per relevant ANSI machine tool guidelines.