Precision Twist Drill 5999253 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999253 is a screw machine length drill bit designed for high-performance drilling in tight-tolerance applications. It measures 0.073 inches in diameter with an overall length of 1-11/16 inches and a flute length of 11/16 inches. Manufactured from high speed steel with a bright/uncoated finish, this bit features a 118-degree standard point angle, a right-hand spiral flute, and a web-thinned tapered web configuration. The straight-cylindrical shank seats securely in standard drill chucks. It meets ANSI standards and is rated for general-purpose use with high-performance classification. Machinists, tool-and-die techs, and maintenance professionals working on precision assemblies will find this bit well-suited to production drilling tasks.

This drill bit belongs to the Series R41 screw machine length family, which is optimized for applications where a shorter overall length improves rigidity and reduces deflection. The 0.073-inch diameter corresponds to Wire Gauge #49, a common size for tapping pilot holes, clearance holes, and precision fastener operations. The 2.5xD flute-to-diameter ratio and web-thinned construction support chip evacuation in demanding materials. Titanium is listed as the primary workpiece material, making this bit appropriate for aerospace, medical, and industrial maintenance work where hard or gummy materials are encountered.

Key Features

• Wire gauge #49 sizing at 0.073 inches diameter for precision fastener and tapping work
• High speed steel construction with bright/uncoated finish for general-purpose use
• 118-degree standard point angle for accurate starting and consistent hole geometry
• Web-thinned tapered web reduces thrust and improves penetration in hard materials
• Screw machine length body improves rigidity and minimizes deflection in short-reach setups
• Meets ANSI standards; Series R41 construction

Compatibility

Designed for use with standard drill chucks accepting a straight-cylindrical shank. Fits drill presses, CNC machining centers, and hand drills configured for screw machine length bits in the 0.073-inch wire gauge range. Listed primary workpiece material is titanium; also suitable for general-purpose drilling applications consistent with high speed steel tooling.

Installation Notes

Secure the straight-cylindrical shank fully in the chuck and verify concentricity before starting a cut. Screw machine length bits are intended for use in drill presses or machine tool setups where the shorter flute length provides added support. Use appropriate cutting fluid when drilling titanium or other hard alloys to extend tool life and manage heat buildup. Inspect the cutting edge before each use and replace any bit showing signs of chipping or excessive wear.