Precision Twist Drill 5999418 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999418 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned, tapered web construction that reduces walking and improves centering on entry. The straight-cylindrical shank seats securely in standard drill chucks. At 0.4062 inches in diameter with a flute length of 1-15/16 inches and an overall length of 3-5/16 inches, it is sized for compact, close-clearance drilling where a jobber-length bit would not fit.

This bit is rated for heavy duty use and is designated for primary workpiece material of titanium, making it suitable for aerospace, mechanical, and industrial maintenance work where hard or tough materials are encountered. The Series R40C designation places it within a line engineered for consistent performance under high-feed, high-torque conditions. The 2.5xD flute-to-diameter ratio supports chip evacuation in short-bore applications. It meets ANSI and NAS 907 standards, which is relevant for shops working to documented specification requirements.

Key Features

• 135-degree split point reduces thrust and improves self-centering on hard materials
• Web-thinned, tapered web construction lowers cutting resistance and heat buildup
• Screw machine length body for use in tight-clearance or turret drilling setups
• High speed steel construction with coated finish for extended tool life
• Right-hand spiral flute with regular helix promotes consistent chip flow
• Meets ANSI and NAS 907 specification standards for controlled industrial use

Compatibility

Designed as an OEM-compatible screw machine length drill bit for use in standard straight-shank drill chucks and turret-style drilling equipment where a 0.4062-inch diameter, Series R40C bit is specified.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard drill press, turret lathe, or CNC drilling equipment with a compatible straight-shank chuck. Secure the shank fully in the chuck before operation and verify runout is within acceptable limits for the application. When drilling titanium or other hard materials, use appropriate cutting fluid and reduce feed pressure to prevent work hardening. Inspect the cutting edge before each use and replace the bit if chipping or dulling is observed.