Precision Twist Drill 5998852 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998852 is a screw machine length drill bit designed for high-speed steel cutting in tight-tolerance applications. It measures 0.1405 inches in diameter with an overall length of 1-15/16 inches and a flute length of 15/16 inches. The 118-degree standard point angle suits general-purpose drilling, while the web-thinned, tapered web configuration reduces thrust force at entry. The straight-cylindrical shank seats securely in standard drill chucks. This bit is part of the Series R41 lineup and carries an ANSI designation, making it a reliable choice for machinists, maintenance technicians, and tool room professionals working with close-tolerance hole requirements.

The 5998852 is rated for use on titanium as the primary workpiece material, which reflects its high-performance classification within the general-purpose grade. The screw machine length format — shorter than jobber length — provides increased rigidity and reduced deflection, making it well suited for drill press work, CNC machining centers, and manual turret lathe operations where stub-length tooling is preferred. The 2.5xD flute-to-diameter ratio supports effective chip evacuation at the shorter flute length. It is sold individually but requires a minimum order quantity of 12 units per order.

Key Features

• 0.1405 inch diameter, falling within the 0.1000 to 0.1500 inch size range for wire-gauge tooling (#28 wire gauge equivalent)
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• High speed steel construction, bright/uncoated finish for general-purpose use
• Screw machine (stub) length design increases rigidity and reduces deflection versus jobber-length bits
• Right-hand cut, regular spiral, straight-cylindrical shank for compatibility with standard drill chucks and collets
• Meets ANSI standards; Series R41 high-performance classification

Compatibility

Designed as an OEM-style replacement or standard tooling selection for screw machine length drill bit applications in the 0.1000 to 0.1500 inch decimal inch size range. Rated for drilling titanium as the primary workpiece material per supplier specification.

Installation Notes

Install in a compatible drill chuck or collet rated for straight-cylindrical shanks before energizing any machine spindle. Machinists and tool room technicians should verify spindle speed and feed rate recommendations for the specific workpiece material before drilling. Ensure the work piece is securely fixtured to prevent movement during operation. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point geometry is compromised.