Precision Twist Drill 5999405 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999405 is a screw machine length drill bit designed for high-performance metal drilling in demanding trade and industrial applications. Ground from high speed steel with a bright, uncoated finish, this bit features a 118-degree standard point angle, a web-thinned and tapered web configuration for improved penetration, and a right-hand spiral flute for efficient chip evacuation. The straight-cylindrical shank seats securely in standard drill chucks. At 2.375 inches overall length with a 1.25-inch flute, this compact stub-length bit delivers added rigidity and reduced deflection compared to jobber-length alternatives.

This bit is suited for screw machine operations, CNC drilling, and short-reach production drilling tasks in metal fabrication and machining environments. The R41 series is rated for general-purpose use with a high-performance designation, and the ANSI standard compliance ensures dimensional consistency. The 0.209-inch diameter corresponds to wire gauge #4, making it a direct selection for applications requiring precise wire-gauge sizing. Machinists, tool-and-die professionals, and maintenance technicians working with titanium and similar materials will find this bit a practical fit for tight-tolerance bores.

Key Features

• 0.209-inch diameter, wire gauge #4 sizing for precise bore applications
• High speed steel construction with bright, uncoated finish for general-purpose metal drilling
• 118-degree standard point angle with web-thinned, tapered web for improved starting and penetration
• Screw machine (stub) length at 2.375 inches overall — increased rigidity, reduced deflection
• Right-hand spiral flute with regular spiral type for consistent chip removal
• ANSI-compliant dimensions; R41 series high-performance designation

Compatibility

Designed as a general-purpose screw machine length drill bit in the R41 series, compatible with standard straight-shank drill chucks and screw machine setups requiring a 0.209-inch diameter, wire gauge #4 bore. Primary workpiece material rating includes titanium; suitable for comparable hard and soft metals within the 0.200- to 0.250-inch drill size range per ANSI specification.

Installation Notes

This bit is installed by machinists and tool operators in drill presses, screw machines, or CNC machining centers equipped with standard drill chucks accepting straight-cylindrical shanks. Ensure the machine is powered down and the chuck is fully secured before beginning any bit change. Use appropriate cutting fluid or coolant where workpiece material and machine setup allow, noting this bit does not support coolant-through delivery. Inspect the cutting edges and web for wear before each use to maintain bore quality and bit integrity.