Precision Twist Drill 5998016 Jobber Drill Bit 31/64 in

Product Description

The PRECISION TWIST DRILL 5998016 is a jobber-length twist drill bit designed for production and maintenance drilling in metal fabrication, HVAC, plumbing, and electrical trade work. The bit measures 31/64 inches (0.4844 inches) in diameter with a 5-7/8 inch overall length and a 4-3/8 inch flute length. It is ground from high speed steel with a steam oxide coating and features a 135-degree split point for fast penetration and reduced walking on hard materials. The straight cylindrical shank fits standard three-jaw chucks on hand drills, drill presses, and magnetic base drills. The web-thinned, tapered web geometry reduces thrust requirements, making this bit practical for hand-held drilling in the field.

This drill bit is suited for right-hand drilling into steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It falls in the R10B series and meets ANSI and NAS 907 specifications, making it appropriate for general-purpose and heavy-duty applications across residential and commercial mechanical trade work. Typical use cases include drilling mounting holes in ductwork, panel enclosures, pipe hangers, strut channel, and structural steel. It is a single-piece per package unit sold individually.

Key Features

• 135-degree standard point angle with web thinning for reduced entry force and minimal bit walk
• Steam oxide coating improves lubricity and provides light corrosion resistance during storage
• High speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Straight cylindrical shank compatible with standard drill chucks — no adapter required
• Two-flute spiral design with regular spiral type for efficient chip evacuation on through-holes
• Meets ANSI and NAS 907 specifications for dimensional accuracy and material grade

Compatibility

Designed for use in standard three-jaw drill chucks on corded and cordless drills, drill presses, and magnetic base drills that accept a straight cylindrical shank at 31/64 inches (0.4844 inches) diameter. Compatible workpiece materials per NAS 907 designation include steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium.

Installation Notes

This bit is installed and used by HVAC technicians, plumbers, electricians, and general mechanical tradespeople. Secure the shank fully in the chuck and verify chuck key is removed before operation. Always de-energize electrical panels and shut off equipment before drilling into live enclosures or structural members near utilities. Use cutting fluid or cutting oil when drilling stainless steel, superalloys, or titanium to extend bit life and maintain dimensional accuracy.