Precision Twist Drill 5998686 Jobber Drill Bit 5/8 in Hss

Product Description

The PRECISION TWIST DRILL 5998686 is a jobber-length drill bit designed for general-purpose drilling in metal and hard materials. It is machined from high speed steel with a steam oxide coating that helps reduce friction and resist corrosion during extended use. The 118-degree standard point angle suits a wide range of workpiece materials, and the web-thinned tip reduces feed pressure for more controlled entry. With a 5/8-inch diameter and a 7.125-inch overall length, this bit fits standard drill chucks and drill press setups. It is a right-hand cut, two-flute, spiral-flute design built for production and field use across metal fabrication, maintenance, and mechanical trade applications.

This bit is rated for use in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The Series R10 designation places it in a general-purpose jobber-length family suited to hand drilling, drill press, and CNC operations where a straight-cylindrical shank is required. Maximum drilling depth matches the flute length at 5.1875 inches. The straight-cylindrical shank diameter is 0.625 inches, which seats securely in standard three-jaw drill chucks. Coolant-through capability is not available on this bit.

Key Features

• 5/8-inch (0.6250 inch) diameter, jobber-length with 7.125-inch overall length
• 118-degree standard point with web-thinned tip for reduced feed force
• High speed steel construction with steam oxide coating for corrosion and friction resistance
• Two-flute regular spiral design with tapered web configuration
• Right-hand cut, straight-cylindrical shank with no flats
• Rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit for use in standard three-jaw drill chucks accepting a 5/8-inch straight-cylindrical shank, conforming to ANSI standards.

Installation Notes

This bit is installed by machinists, maintenance mechanics, and trade professionals using standard drill chucks on hand drills, drill presses, or CNC spindles. Ensure the chuck is fully tightened and the workpiece is secured before starting a cut. Use appropriate cutting fluid when drilling stainless steel, superalloys, or titanium to manage heat buildup and extend bit life. Inspect the cutting edges for wear before each use and replace the bit if the point shows chipping or heat discoloration.