Precision Twist Drill 5999144 Wire 61 Jobber Drill Bit Hss

Product Description

The PRECISION TWIST DRILL 5999144 is a jobber-length drill bit sized to wire gauge 61, equivalent to 0.0390 inches in diameter, designed for general-purpose drilling in metal and hard materials. Manufactured from high speed steel with a steam oxide coating, it runs a standard 118-degree point angle with a right-hand spiral flute and web-thinned tip geometry for cleaner entry. Overall length is 1.625 inches with a flute length of 0.6875 inches. The straight-cylindrical shank seats directly in standard drill chucks without adapters. This bit is sold individually and is intended for use by machinists, maintenance technicians, and trade professionals requiring precision small-diameter drilling.

The 5999144 is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It is a general-purpose selection for production drilling, toolroom work, and field maintenance tasks where a wire-gauge drill is called for. The Series R18 designation indicates an 18xD flute-to-diameter ratio, making it appropriate for standard jobber-length applications rather than deep-hole work. Maximum drilling depth matches the flute length at 0.6875 inches. No coolant-through capability is present, so external coolant or cutting fluid should be applied at the workpiece when drilling harder materials.

Key Features

• Wire gauge size 61 (0.0390 inches diameter) for precise small-hole applications
• High speed steel construction with steam oxide coating for wear and corrosion resistance
• 118-degree standard point angle with web-thinned, tapered web configuration
• Right-hand cut, regular spiral, 2-flute design for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• Meets ANSI standards for jobber-length drill geometry

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit compatible with any standard drill chuck or drill press capable of accepting a 0.0390-inch straight-cylindrical shank, across Series R10, R15, and R18 tooling setups.

Installation Notes

Installation is performed by machinists or qualified technicians using a compatible drill press, CNC machine, or handheld power drill with an appropriate chuck. Secure the shank firmly in the chuck before operation and verify runout before beginning a cut. Apply cutting fluid or coolant at the workpiece surface when drilling stainless steel, superalloys, or titanium to extend tool life and maintain hole quality. Do not exceed the maximum drilling depth of 0.6875 inches in a single pass without clearing chips.