Precision Twist Drill 5998288 Jobber Drill Bit No. 11

Product Description

The PRECISION TWIST DRILL 5998288 is a jobber-length twist drill bit sized to wire gauge No. 11, equal to 0.1910 inches in decimal. The bit is manufactured from high speed steel and carries a steam oxide coating that reduces friction and extends cutting life in ferrous materials. It features a 118-degree standard point angle, a regular spiral flute with web-thinning, and a right-hand cutting direction. Overall length is 3.5 inches with a 2.3125-inch flute length. Licensed tradespeople and machinists use this bit for general-purpose drilling in production and maintenance environments.

This bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium in both shop and field applications. The straight-cylindrical shank seats directly in standard drill chucks without adapters, making it compatible with handheld drills, drill presses, and CNC drilling setups. The Series R18 designation places it within a general-purpose jobber line intended for everyday production drilling where a consistent, reliable hole in a range of materials is required.

Key Features

• Wire gauge No. 11 sizing at 0.1910 inches decimal for precise hole specification matching
• High speed steel construction handles heat generated in ferrous and hard material drilling
• Steam oxide coating reduces friction and provides light corrosion resistance during storage and use
• 118-degree standard point angle for general-purpose entry into a broad range of workpiece materials
• Web-thinned tapered web reduces thrust load and improves chip evacuation
• Right-hand spiral flute with 12xD flute-to-diameter ratio supports maximum drilling depth of 2.3125 inches

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with standard straight-shank drill chucks across handheld, bench, and machine tool applications. Meets ANSI specification standards. Suitable for primary workpiece material codes P, M, K, N, and S as defined by the supplier specification.

Installation Notes

Installation and use should be performed by qualified machinists, tool-and-die tradespeople, or maintenance technicians familiar with drilling operations. Secure the workpiece firmly before engaging the bit to prevent walking at the point. Power down and de-energize any machine tool before changing bits or adjusting chuck tension. Do not exceed the maximum drilling depth of 2.3125 inches in a single pass without withdrawing the bit to clear chips.