Precision Twist Drill 5998610 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998610 is a screw machine length drill bit engineered for high-performance drilling in demanding trade and production environments. Manufactured from high speed steel with a coated finish, this bit measures 0.0785 inches in diameter and features a 135-degree split point for accurate starting and reduced walking on entry. The web-thinned, tapered web construction lowers thrust requirements and extends tool life. Series R41C designation indicates a heavy-duty, ANSI-compliant build suited for machinists, pipefitters, and production drilling applications where short-length rigidity is required.

This screw machine length bit is sized for compact drilling setups where a jobber-length bit would introduce flex or chatter. The 0.0785-inch decimal diameter corresponds to wire gauge size 47, making it suitable for tap drilling, clearance holes, and precision hole work in titanium and similarly demanding workpiece materials. The straight-cylindrical shank fits standard drill chucks without modification. Its 2.5xD flute-to-diameter ratio provides adequate chip evacuation for short, controlled cuts. Licensed machinists, tool-and-die professionals, and maintenance mechanics are the primary installers.

Key Features

• 0.0785-inch diameter, wire gauge size 47 for precision hole sizing
• 135-degree split point reduces walking and lowers entry thrust
• Web-thinned tapered web construction improves chip clearance and cutting efficiency
• High speed steel construction with coated finish for extended wear resistance
• Screw machine (stub) length provides added rigidity in tight or shallow-clearance applications
• Right-hand cut, spiral flute, straight-cylindrical shank for standard chuck compatibility
• Meets ANSI and NAS 907 standards; heavy-duty grade for production environments

Compatibility

Rated for use in titanium as the primary workpiece material; ANSI and NAS 907 compliant, making it suitable for aerospace and industrial production drilling where those specifications are required. Coolant-through is not supported on this bit.

Installation Notes

Install in a keyed or keyless drill chuck rated for the shank diameter before powering the machine. Secure the workpiece firmly before drilling to prevent movement under cutting load. For titanium and other hard materials, use appropriate cutting fluid to manage heat buildup and extend bit life. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed.