Precision Twist Drill 5999131 Jobber Drill Bit No 59

Product Description

The PRECISION TWIST DRILL 5999131 is a jobber-length drill bit designed for general-purpose drilling in a wide range of metallic and hard materials. Sized to wire gauge No. 59 with a decimal diameter of 0.0410 inches, it is ground from high speed steel and finished with a steam oxide coating that reduces friction and provides light corrosion resistance. The bit features a 118-degree standard point angle and a two-flute spiral design with a regular spiral type and web-thinned, tapered web configuration. Overall length is 1.625 inches with an 11/16-inch flute length, making it well suited for precision hole drilling in tight clearance applications. Installation and use are typical for licensed machinists, tool-and-die professionals, and HVAC or sheet metal technicians working with small-diameter pilot holes.

This bit is rated for drilling into steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium, covering ISO material codes P, M, K, N, and S. Its 17xD flute-to-diameter ratio and straight cylindrical shank make it compatible with standard drill chucks across benchtop drill presses, CNC machining centers, and hand-held power drills. The Series R10-R15-R18 designation places it within PRECISION TWIST DRILL's general-purpose jobber line, commonly stocked in shop tooling kits for repetitive small-hole operations and tap drilling applications.

Key Features

• Wire gauge No. 59 size at 0.0410 inches decimal diameter for precision small-hole work
• 118-degree standard point angle with web-thinned, tapered web for improved penetration in hard stock
• Steam oxide coating reduces friction and provides light surface protection
• Two-flute regular spiral design promotes chip evacuation in deep drilling passes up to 11/16 inch depth
• Straight cylindrical shank fits standard drill chucks without adapters
• Conforms to ANSI standards for jobber-length drill bit geometry

Compatibility

Suitable for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. Designed as a general-purpose jobber-length replacement or stock bit compatible with any drill chuck accepting a 0.0410-inch straight cylindrical shank.

Installation Notes

Secure the bit firmly in the chuck and verify concentricity before starting the cut to prevent bit breakage at this small diameter. Use cutting fluid or lubricant when drilling stainless steel, superalloys, or titanium to manage heat buildup. Reduce feed pressure as the point breaks through to avoid bit deflection or snapping. Coolant-through is not supported on this bit; external fluid application only.