Precision Twist Drill 5999075 Cobalt Jobber Drill Bit V

Product Description

The PRECISION TWIST DRILL 5999075 is a cobalt jobber-length drill bit sized to Letter V (0.3770 inches decimal) with a 135-degree split point and a straw oxide/bronze coating. Manufactured from cobalt high-speed steel for heavy-duty cutting performance, the bit features a web-thinned, tapered web configuration that reduces thrust and improves chip clearance at the point. It is a right-hand cutting, regular spiral flute design with a straight cylindrical shank sized at 0.3770 inches. At 5 inches overall length with a 3.625-inch flute length, this bit is suited for production and maintenance drilling in steel and other ferrous and non-ferrous materials. Licensed machinists, tool-room technicians, and industrial maintenance mechanics are the primary installers.

This bit is designed for drilling steel as its primary workpiece material, with a workpiece material code covering P, M, K, N, and S material groups, making it applicable across mild steel, alloy steel, stainless steel, cast iron, non-ferrous metals, and heat-resistant superalloys. It is listed under Series R10CO-R15CO-R18CO and meets NAS 907 and ANSI standards. Typical applications include through-hole and blind-hole drilling in fabrication shops, maintenance facilities, and production environments where a reliable general-purpose cobalt drill is required. The 10xD flute-to-diameter ratio delivers adequate chip evacuation for moderate-depth holes up to the maximum drilling depth of 3.625 inches.

Key Features

• Cobalt high-speed steel construction rated for heavy-duty drilling in steel and difficult materials
• 135-degree split point with web thinning reduces walking and lowers required thrust force
• Straw oxide/bronze proprietary coating provides lubricity and heat resistance during cutting
• Right-hand regular spiral flute with tapered web for efficient chip evacuation
• Straight cylindrical shank at 0.3770 inches fits standard drill chucks and toolholders
• Meets NAS 907 and ANSI standards for dimensional and performance consistency

Compatibility

Designed as an OEM-specification cobalt jobber drill conforming to NAS 907 and ANSI standards, compatible with any standard drill chuck or toolholder accepting a 0.3770-inch straight shank. Part of the PRECISION TWIST DRILL Series R10CO-R15CO-R18CO cobalt jobber line.

Installation Notes

This drill bit is installed by machinists and industrial maintenance mechanics using a drill press, CNC machining center, or handheld drill motor with a compatible chuck. Secure the workpiece firmly before drilling and confirm chuck runout is within acceptable limits to prevent premature edge wear. Apply cutting fluid or coolant appropriate for the workpiece material when drilling steel to extend tool life. Follow ANSI safety standards for rotating tool operation, including proper eye protection and workpiece clamping.