Precision Twist Drill 5999098 Jobber Drill Bit No 23 Hss

Product Description

The PRECISION TWIST DRILL 5999098 is a jobber-length twist drill bit in wire gauge size No. 23, measuring 0.154 inches in diameter. Built from high speed steel with a steam oxide coating, it features a 135-degree split-point tip that reduces walking on entry and lowers thrust requirements compared to conventional 118-degree points. The spiral flute geometry is regular-helix with a tapered web and web-thinned point for improved chip evacuation. Overall length is 3.125 inches with a 2-inch flute length. This is a general-purpose, heavy-duty grade bit suited for production drilling in metal fabrication, mechanical contracting, and maintenance environments.

The 5999098 is designed for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium, covering ISO material codes P, M, K, N, and S. The straight cylindrical shank seats in standard drill chucks without adapters, making it compatible with hand drills, drill presses, and CNC machining centers. It is well suited to high-volume repetitive drilling applications where consistent hole quality and tool life in hard and abrasive materials are priorities. The bit conforms to ANSI and NAS 907 specifications.

Key Features

• Wire gauge No. 23 diameter, 0.154 inches, for precision hole sizing
• 135-degree standard split-point reduces bit walk and entry thrust
• Steam oxide coating provides lubricity and corrosion resistance during storage and use
• Web-thinned, tapered web construction improves chip clearance in deep holes
• Flute-to-diameter ratio of 13xD with 2-inch maximum drilling depth
• Meets ANSI and NAS 907 standards; Series R10B-R15B-R18B

Compatibility

Designed as a general-purpose OEM-style jobber drill bit for use in standard drill chucks accepting a 0.154-inch straight cylindrical shank. Suitable for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium.

Installation Notes

Install and replace drill bits with the drill unplugged or the machine powered down and locked out per applicable OSHA lockout/tagout procedures. Seat the straight shank fully and evenly in the chuck before tightening. Use appropriate cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to extend tool life. Inspect the cutting edges and web area for wear or chipping before each use and replace if the point shows signs of heat damage or deformation.