Precision Twist Drill 5999231 No 51 Hss Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5999231 is a jobber-length twist drill bit sized to wire gauge No. 51, with a decimal diameter of 0.0670 inches. Built from high speed steel and finished with a steam oxide coating, this bit is engineered for general-purpose drilling in metal fabrication and maintenance applications. It features a 118-degree standard point angle, a right-hand spiral flute configuration, and a straight-cylindrical shank. Overall length is 2 inches, with a 1-inch flute length and a maximum drilling depth of 1 inch. The web-thinned, tapered web design reduces thrust at the point and improves chip evacuation. This bit is sold individually and is part of the R18 series product family.

This drill bit is suited for use on steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It is a standard workhorse for machinists, maintenance technicians, and metalworking shops that need a reliable small-diameter bit for through-hole drilling and pilot hole operations. The regular spiral type and 15xD flute-to-diameter ratio make it appropriate for a wide range of production and repair drilling tasks on both benchtop drill presses and hand-held drilling equipment.

Key Features

• Wire gauge No. 51 size — 0.0670 inch diameter for precise small-hole drilling
• High speed steel construction with steam oxide coating for corrosion resistance and reduced friction
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Right-hand cut, regular spiral flute for efficient chip removal
• Straight-cylindrical shank compatible with standard drill chucks
• Meets ANSI standards for jobber-length drill bit geometry

Compatibility

Designed as a general-purpose OEM-style jobber-length drill bit suitable for use with standard drill presses, CNC drilling equipment, and hand-held power drills accepting straight-cylindrical shanks. Rated for workpiece materials including steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trained technicians familiar with drill press or power tool operation. Secure the straight-cylindrical shank firmly in the chuck before operation and verify concentricity to minimize runout. Always use appropriate cutting fluid or coolant when drilling ferrous metals and hard alloys to extend tool life. Ensure workpiece is clamped securely before beginning any drilling operation.