Precision Twist Drill 5998600 Screw Machine Drill Bit No. 11

Product Description

The PRECISION TWIST DRILL 5998600 is a No. 11 wire gauge screw machine length drill bit engineered for high-performance drilling applications. Built from high-speed steel with a coated finish, it features a 135-degree split point with web thinning for fast, accurate starts and reduced walking on entry. The overall length is 2.25 inches with a flute length of 1.1875 inches, making it compact and suited to close-clearance drilling operations. The straight-cylindrical shank measures 0.1910 inches in diameter. This bit is installed and used by machinists, tool-and-die tradespeople, and maintenance technicians working with precision drilling equipment.

The 5998600 is designed for drilling titanium and similarly demanding workpiece materials where point geometry and tool performance are critical. The screw machine length profile provides added rigidity compared to jobber-length bits, reducing deflection in short-reach drilling setups. The regular spiral with a 2.5xD flute-to-diameter ratio promotes efficient chip evacuation. It conforms to ANSI and NAS 907 standards and is rated for heavy-duty service in production and repair shop environments.

Key Features

• No. 11 wire gauge size, 0.1910 inch decimal equivalent
• 135-degree split point with web thinning for self-centering entry and reduced thrust
• High-speed steel construction with coated finish for extended tool life
• Screw machine length body for increased rigidity in short-reach applications
• Right-hand cut, straight-cylindrical shank compatible with standard drill chucks
• Meets ANSI and NAS 907 specifications for dimensional and performance standards

Compatibility

Designed as an OEM-style screw machine length drill bit for use in standard drill chucks and screw machine setups accepting a 0.1910 inch straight-cylindrical shank. Primary workpiece material rating is titanium, suitable for other hard and demanding materials in production drilling environments.

Installation Notes

Machinists and maintenance technicians should ensure the drill chuck is properly tightened and the workpiece is securely fixtured before operation. Power down the machine and disconnect it from its power source before changing bits. Apply appropriate cutting fluid when drilling titanium or other hard materials to manage heat and extend tool life. Inspect the cutting edges for wear before each use and replace the bit if chipping or dulling is observed.