Precision Twist Drill 5998320 5/16 Inch Hss Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5998320 is a jobber-length drill bit designed for general-purpose drilling in metal and hard materials. It measures 5/16 inch (0.3125 inch) in diameter with an overall length of 4.5 inches and a flute length of 3.1875 inches. The bit is manufactured from high speed steel with a bright uncoated finish, ground to a standard 118-degree point angle. A tapered web with web-thinning reduces thrust during entry. Right-hand spiral flutes evacuate chips efficiently during through-hole and blind drilling operations. This bit is typically installed by machinists, millwrights, pipefitters, plumbers, and HVAC technicians performing layout and fabrication work.

The 5998320 is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The straight cylindrical shank fits standard three-jaw drill chucks on corded drills, drill presses, and magnetic base drills. The Series R10P regular spiral geometry makes it a practical everyday bit for shop and field use where a general-purpose HSS bit is called for. Maximum drilling depth reaches 3.1875 inches, matching the full flute length.

Key Features

• 5/16 inch diameter, 0.3125 inch decimal, straight cylindrical shank for standard chuck compatibility
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• High speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Regular spiral, 2-flute design promotes efficient chip evacuation
• 4.5 inch overall length with 3.1875 inch flute length and 1.3125 inch shank length
• ANSI standard geometry, Series R10P general-purpose grade

Compatibility

Designed as a general-purpose jobber-length replacement bit for use in any standard drill chuck accepting a 5/16 inch straight cylindrical shank. Compatible with the R10P, R15P, and R18P series designations per the manufacturer.

Installation Notes

Secure the shank fully in the drill chuck and tighten with a chuck key before operation. Power down and disconnect or lock out the drill press or tool before changing bits. Use appropriate cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to extend tool life. Inspect the cutting edges for chipping or dulling before each use; a damaged point increases the risk of bit walking and workpiece damage.