Precision Twist Drill 5999408 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999408 is a screw machine length drill bit engineered for high-performance drilling in demanding shop and field applications. Manufactured from high speed steel with a coated finish, this bit features a 135-degree split point that reduces walking and lowers thrust on entry. The straight-cylindrical shank seats securely in standard chucks. At 0.323 inches in diameter and 2-15/16 inches overall length, this is a stub-length bit built for rigidity and reduced deflection in short-reach drilling operations. Licensed machinists, tool and die technicians, and industrial maintenance trades are the primary installers.

This bit is designed for drilling titanium and similarly tough workpiece materials where a standard twist drill would deflect or chatter. The screw machine length format keeps the cutting edge close to the chuck, maximizing stiffness. Series R42C denotes a heavy-duty, high-performance classification. The 1-11/16-inch flute length and 2.5xD flute-to-diameter ratio are suited for shallow-to-moderate depth holes in production and MRO environments. The right-hand cut and regular spiral type are consistent with conventional drill press, CNC, and handheld power tool applications.

Key Features

• 135-degree split point reduces center walking and decreases feed pressure on hard materials
• Web-thinned, tapered web configuration improves chip evacuation and reduces heat buildup
• High speed steel construction with coated finish for extended tool life on titanium and hard alloys
• Screw machine (stub) length design maximizes rigidity and minimizes deflection
• Straight-cylindrical shank fits standard drill chucks without modification
• Meets ANSI and NAS 907 standards for dimensional accuracy and material grade

Compatibility

Designed for use in drill presses, CNC machining centers, and handheld power tools accepting a straight-cylindrical shank. Rated for primary workpiece material titanium; also suitable for other hard metals within the Series R42C heavy-duty application range. Drill bit size falls within the 0.3000 to 0.3500 decimal inch range.

Installation Notes

Secure the shank fully in the chuck and confirm runout before drilling. When working titanium or hard alloys, use appropriate cutting fluid and avoid excessive feed pressure that can work-harden the material or overheat the cutting edge. Inspect the split point for chipping before each use; a damaged point will increase thrust and reduce hole quality. Follow shop-specific speeds and feeds for the workpiece material and bit diameter.