Precision Twist Drill 5999058 Jobber Drill Bit 12

Product Description

The PRECISION TWIST DRILL 5999058 is a jobber-length drill bit sized to wire gauge 12 (0.1890 inches decimal equivalent) designed for general-purpose drilling in a wide range of materials. Built from high speed steel with a steam oxide coating, this bit runs a 135-degree split-point angle that reduces walking on contact and lowers the thrust needed to start a hole. It features a 2-flute spiral flute design with a web-thinned, tapered web configuration and a straight cylindrical shank. Overall length is 3.5 inches with a flute length of 2.3125 inches. Installation is performed by machinists, maintenance technicians, and multi-trade professionals working in fabrication, mechanical, and field service contexts.

This drill bit is suited for drilling in steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. Its jobber-length geometry makes it a standard-reach solution for bench drill press work, hand drill operations, and portable machine setups where a compact but full-featured bit is required. It conforms to ANSI standards and meets NAS 907 specification requirements, making it appropriate for aerospace and heavy-duty industrial applications as well as general shop use.

Key Features

• Wire gauge size 12 with 0.1890 inch decimal equivalent diameter
• 135-degree standard split point reduces bit walking and entry thrust
• High speed steel construction with steam oxide finish for heat and corrosion resistance
• Web-thinned tapered web for improved chip clearing and reduced torque
• 2-flute regular spiral for efficient chip evacuation in a wide range of materials
• Meets ANSI standards and NAS 907 specification for heavy-duty and aerospace-grade drilling

Compatibility

Compatible with standard straight-shank drill chucks accepting a 0.1890 inch shank diameter. Suitable for use in hand drills, drill presses, and portable drill equipment across steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium workpieces. Part of the R10B, R15B, and R18B series.

Installation Notes

This bit is installed by machinists and multi-trade technicians using standard keyed or keyless chuck equipment rated for the shank diameter. Secure the workpiece before drilling and verify chuck grip before operating. Maximum drilling depth should not exceed the rated flute length of 2.3125 inches. Follow applicable shop safety practices and use appropriate cutting fluid when drilling hard or abrasive materials to extend bit life.