Precision Twist Drill 5998849 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998849 is a screw machine length drill bit designed for high-performance drilling in demanding shop and field applications. Machined from high speed steel with a bright, uncoated finish, it features a 0.144 inch diameter corresponding to wire gauge size 27. The 118-degree standard point angle and web-thinned, tapered web geometry reduce thrust and improve chip evacuation. The right-hand spiral flute and straight cylindrical shank make it compatible with standard drill chucks and CNC toolholders. This bit is built to ANSI standards and suited for machinists, tool and die technicians, and production drilling operations.

The 5998849 is suited for drilling titanium and comparable hard or abrasive workpiece materials where a stubby, rigid tool is preferred over a jobber-length bit. The screw machine length body, with a 1 inch flute length and 2-1/16 inch overall length, limits deflection in short-reach setups, turret lathes, screw machines, and CNC drill cycles. The 2.5xD flute-to-diameter ratio supports efficient chip clearance at the small diameter without sacrificing tool stiffness.

Key Features

• 0.144 inch diameter, wire size 27, for precise small-hole work
• High speed steel construction rated for general-purpose to high-performance applications
• Web-thinned, tapered web reduces entry thrust and improves point stability
• 118-degree standard point angle for broad material compatibility
• Screw machine length body minimizes deflection in tight setups
• Meets ANSI standards; right-hand cut with regular spiral flute

Compatibility

Part of the Precision Twist Drill Series R41, sized for wire gauge 27 applications within the 0.1000 to 0.1500 inch drill bit size range. Fits any standard drill chuck or CNC toolholder accepting a straight cylindrical shank at this diameter.

Installation Notes

Install in a properly sized drill chuck or collet and verify runout before use. Secure the workpiece firmly to prevent walking at small diameters. Follow shop-standard speeds and feeds for the workpiece material; high speed steel tooling requires adequate cutting fluid or lubrication when drilling titanium or similar hard alloys. Inspect the point for wear or chipping between uses, as small-diameter bits are susceptible to breakage under lateral load.