Precision Twist Drill 5998855 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998855 is a screw machine length drill bit designed for high-performance drilling in tight-clearance applications. Built from high speed steel (HSS) with a bright, uncoated finish, this bit features a 118-degree standard point angle and a regular spiral flute for efficient chip evacuation. The straight-cylindrical shank ensures positive chuck engagement in standard drill chucks and machine spindles. At 0.136 inches in diameter (Wire Size #29) with an overall length of 1-15/16 inches and a flute length of 15/16 inches, this bit suits stub-length drilling where rigidity and precision matter. It is installed and used by machinists, maintenance technicians, and trade professionals working with production drilling equipment.

This screw machine drill bit is rated for general purpose use and is optimized for drilling titanium as its primary workpiece material, along with other metals common in production and maintenance environments. The R41 series designation places it within Precision Twist Drill's line of web-thinned, tapered-web stub-length bits. The 2.5xD flute-to-diameter ratio provides added stability over standard jobber-length bits, making it well suited for use in drill presses, CNC machining centers, and turret lathes where shorter flute length reduces deflection.

Key Features

• Wire Size #29 diameter: 0.136 inches for precise hole sizing
• High speed steel construction for durability across metal drilling applications
• 118-degree standard point angle with web-thinned, tapered-web geometry for improved penetration
• Bright, uncoated finish suitable for a wide range of metalworking operations
• Screw machine (stub) length reduces deflection in high-speed production drilling
• ANSI-specification compliant construction

Compatibility

Designed as an OEM-style replacement and standard screw machine drill bit for use in drill presses, CNC machining centers, turret lathes, and hand-held drill motors accepting straight-cylindrical shank bits in the 0.136-inch diameter range.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard drill chucks or collet systems. Ensure the machine spindle is fully powered down and locked out before changing bits. Secure the straight-cylindrical shank firmly in the chuck to the full depth of the shank to prevent slippage. Follow applicable shop safety standards and machine manufacturer guidelines for spindle speed and feed rate when drilling titanium or hardened metals.