Precision Twist Drill 5999359 No 27 Hss Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5999359 is a No. 27 wire-size jobber-length drill bit manufactured from high speed steel with a steam oxide finish. It carries a 118-degree standard point angle and a right-hand spiral flute configuration, making it a general-purpose drilling tool suited for production and maintenance work. The bit measures 3 inches overall length with a 1.875-inch flute length and a straight-cylindrical shank diameter of 0.1440 inches. Two flutes with a regular spiral type and a web-thinned, tapered web design promote chip evacuation and reduce thrust during drilling. Licensed machinists, maintenance technicians, and metalworking tradespeople use this bit for precision hole-making in a wide range of ferrous and non-ferrous base materials.

This jobber drill is designed for drilling operations in steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. The steam oxide coating provides light lubricity and corrosion resistance during storage and use. It conforms to ANSI standards and meets NAS 907 specification requirements, making it suitable for aerospace-adjacent and general industrial drilling applications where dimensional consistency is required. The 13xD flute-to-diameter ratio supports deeper hole drilling within the bit's rated maximum drilling depth of 1.875 inches.

Key Features

• No. 27 wire size with 0.1440-inch decimal diameter for precise hole tolerancing
• 118-degree standard point angle with web-thinned, tapered web for reduced entry force
• High speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Steam oxide coating provides light lubricity and corrosion resistance
• Right-hand cut, regular spiral, straight-cylindrical shank for use in standard drill chucks
• Meets ANSI standards and NAS 907 specification

Compatibility

Designed as an OEM-style general-purpose jobber drill bit for use in standard drill presses, hand drills, and CNC drilling equipment accepting a 0.1440-inch straight-cylindrical shank. Belongs to Series R10A-R15A-R18A.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill chuck sized to accept a 0.1440-inch shank. Secure the workpiece firmly before drilling and ensure the drill press or power tool is powered down before inserting or removing the bit. Apply appropriate cutting fluid when drilling stainless steel, superalloys, or titanium to manage heat buildup. Inspect the cutting edges for wear before each use and replace the bit if chipping or dulling is observed.