Precision Twist Drill 5998451 Jobber Drill Bit 15/64 in

Product Description

The PRECISION TWIST DRILL 5998451 is a jobber-length drill bit designed for general-purpose drilling in a wide range of materials. Built from high speed steel with a bright uncoated finish, this bit features a 118-degree standard point angle, a two-flute right-hand spiral configuration, and a web-thinned tapered web for efficient chip evacuation and reduced thrust at entry. The straight-cylindrical shank measures 15/64 inch (0.2344 inch decimal) in diameter, matching the drill diameter for use in standard chucks. The overall length is 3.875 inches with a flute length of 2.625 inches. Licensed trades and maintenance professionals use this bit for drilling holes in steel, cast iron, non-ferrous metals, and superalloys including titanium.

This bit is suited for production and maintenance drilling applications where a standard jobber-length geometry is appropriate. Its 11xD flute-to-diameter ratio provides reach and chip clearance typical of jobber-length tooling. The Series R10H-R18H designation places it in a general-purpose high speed steel line conforming to ANSI standards. It is a single-unit item packaged individually and sized at 15/64 inch, falling within the 0.2000 to 0.2500 inch drill diameter range. It is appropriate for use in drill presses, hand drills, and CNC drill operations that do not require coolant-through tooling.

Key Features

• 15/64 inch (0.2344 inch) diameter with matching straight-cylindrical shank
• 118-degree standard point angle with web-thinned tapered web for reduced entry thrust
• Two-flute right-hand spiral, regular spiral type, for positive chip evacuation
• 2.625-inch flute length provides a maximum drilling depth of 2.625 inches
• High speed steel construction rated for steel, cast iron, non-ferrous metals, and superalloys
• Bright uncoated finish; no coolant-through feature; ANSI-conforming geometry

Compatibility

Designed as a general-purpose jobber-length drill bit suitable for drilling steel, cast iron, non-ferrous metals, and superalloys including titanium. Compatible with any standard drill chuck accepting a straight-cylindrical shank at 15/64 inch diameter.

Installation Notes

This bit is installed and used by machinists, maintenance technicians, and trade professionals operating drill presses, hand drills, or CNC equipment. Ensure the chuck is fully tightened and the workpiece is securely clamped before beginning any drilling operation. Do not exceed the material and speed ratings appropriate for high speed steel tooling. Use cutting fluid when drilling steel or hard alloys to extend bit life and improve hole quality.