Precision Twist Drill 5998069 Jobber Drill Bit 61 Hss

Product Description

The PRECISION TWIST DRILL 5998069 is a jobber-length drill bit in wire gauge size 61, equivalent to 0.0390 inches in diameter, designed for general-purpose drilling in metalworking applications. Built from high speed steel with a bright uncoated finish, this bit features a 118-degree standard point angle, a two-flute spiral configuration, and a web-thinned, tapered web design that reduces thrust and improves chip evacuation. The straight-cylindrical shank measures 0.0390 inches in diameter and 15/16 inches in length, giving it a clean, direct fit in standard drill chucks. Licensed HVAC techs, machinists, plumbers, and electricians reach for this size when working with fine hardware, instrument fittings, and precision clearance holes.

This bit is suited for right-hand drilling into a broad range of workpiece materials including steel, cast iron, non-ferrous metals, superalloys, and titanium. The 18xD flute-to-diameter ratio and 11/16-inch flute length make it appropriate for shallow, controlled-depth drilling tasks common in sheet metal work, instrumentation, and light fabrication. It conforms to ANSI standards and falls within the R10H-R18H series from Precision Twist Drill. Each unit is packaged individually and is intended for professional trade use where dimensional accuracy in small-diameter holes is required.

Key Features

• Wire gauge size 61, 0.0390-inch decimal diameter for precise small-hole drilling
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• High speed steel construction for durability across steel, cast iron, non-ferrous metals, superalloys, and titanium
• Bright uncoated finish suitable for general-purpose metalworking without additional coating wear concerns
• Two-flute regular spiral design promotes efficient chip removal in shallow drilling applications
• ANSI-compliant geometry; part of the established R10H-R18H series

Compatibility

Designed as a general-purpose replacement or stock drill bit for right-hand drilling applications in steel, cast iron, non-ferrous metals, superalloys, and titanium. Fits any standard drill chuck accepting a 0.0390-inch straight-cylindrical shank.

Installation Notes

This bit is installed and operated by machinists, electricians, plumbers, and HVAC technicians using standard drill presses, hand drills, or CNC equipment with a compatible chuck. Secure the straight shank fully in the chuck before operation and verify the workpiece is clamped to prevent movement. Coolant-through is not supported on this bit; use cutting fluid applied externally when drilling harder alloys or superalloys to manage heat buildup. Replace the bit if visible wear, chipping, or walking on entry is observed, as small-diameter bits at this size offer limited resharpening margin.