Precision Twist Drill 5998649 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998649 is a screw machine length drill bit designed for high-performance metal drilling applications. Built from high speed steel with a coated finish, this bit features a standard 118-degree point angle and a web-thinned, tapered web configuration that reduces thrust and improves chip evacuation. The straight-cylindrical shank seats securely in standard drill chucks without slipping. At 23/32 inch (0.7188 inches) in diameter with a 3-inch flute length and 4.75-inch overall length, it is sized for production drilling environments where stub-length rigidity matters. This bit is installed by machinists and maintenance technicians working in metal fabrication, HVAC equipment manufacturing, and mechanical trade shops.

The 5998649 belongs to the Series R40 line and is rated for right-hand spiral flute cutting in high-performance applications. Its primary workpiece material rating is titanium, which also makes it effective on other tough alloys and ferrous metals commonly encountered in trade and industrial settings. The 2.5xD flute-to-diameter ratio provides chip clearance in deeper holes without sacrificing the rigidity that screw machine length bits are known for. This bit is suitable for use in drill presses, CNC machining centers, and hand-held power tools where a straight-cylindrical shank is required.

Key Features

• 23/32 inch (0.7188 inches) diameter, screw machine length for stub rigidity
• High speed steel construction with coated finish for extended tool life
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Right-hand spiral flute with 2.5xD flute-to-diameter ratio for efficient chip removal
• Straight-cylindrical shank compatible with standard drill chucks
• ANSI standard compliance, Series R40 general purpose grade

Compatibility

Designed as a screw machine length replacement drill bit rated for titanium and general-purpose metal drilling; compatible with any drill press, machining center, or power tool accepting a straight-cylindrical shank in the 23/32 inch diameter range.

Installation Notes

Machinist or tool-and-die technicians typically install and operate this bit. Secure the straight-cylindrical shank fully in the chuck and verify runout before drilling. Apply appropriate cutting fluid for the workpiece material to maintain bit temperature and edge life. Inspect the cutting edges and web before each use and replace the bit if chipping or excessive wear is observed.