Precision Twist Drill 5998929 Drill Bit Letter X Hss

Product Description

The PRECISION TWIST DRILL 5998929 is a jobber-length drill bit sized to letter X (0.3970 inches decimal equivalent), designed for general-purpose drilling in metal and hard materials. Built from high-speed steel with a bright uncoated finish, this bit features a standard 118-degree split point and a web-thinned, tapered web construction that reduces thrust and improves chip evacuation. The two-flute spiral design in a regular helix provides consistent chip removal during through-hole and blind-hole drilling operations. With an overall length of 5.125 inches and a 3.75-inch flute length, it fits standard drill chucks and is suited for bench drill presses, hand drills, and CNC drilling applications.

This bit is intended for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. It is well-suited for maintenance, fabrication, and production drilling work in commercial and industrial environments. The straight cylindrical shank with no flats seats securely in standard keyless or keyed chucks. Licensed machinists, pipefitters, HVAC installers, and general metal fabricators are the typical end users. Maximum drilling depth is 3.75 inches, matching the full flute length.

Key Features

• Letter X size — 0.3970 inches decimal equivalent for precise hole sizing
• 118-degree standard point angle with web thinning for reduced entry thrust
• High-speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Regular spiral, two-flute design promotes efficient chip evacuation
• Straight cylindrical shank (0.3970 inches diameter) fits standard drill chucks without adapters
• ANSI-specification compliance — Series R10P/R15P/R18P jobber length standard

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit compatible with any standard drill chuck accepting a 0.3970-inch straight cylindrical shank, including hand drills, drill presses, and CNC machine tool spindles used in metal fabrication and maintenance applications.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals following applicable shop safety practices. Secure the straight shank fully in the chuck and verify runout before drilling. Always wear appropriate eye protection and secure the workpiece firmly before operation. Do not exceed the recommended drilling depth of 3.75 inches, and use appropriate cutting fluid when drilling stainless steel, superalloys, or titanium to extend tool life.