Precision Twist Drill 5998965 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998965 is a screw machine length drill bit engineered for high-performance drilling in demanding trade and industrial applications. Sized at 0.348 inches (Letter S) in diameter and manufactured from high speed steel with a coated finish, this bit features a 135-degree split point and a web-thinned, tapered web configuration that reduces thrust and improves hole entry accuracy. The straight-cylindrical shank seats securely in standard drill chucks. With a total overall length of 3-1/16 inches and a 1-3/4 inch flute length, it is built for use in screw machine and production drilling setups where compact length and rigidity matter.

This drill bit is rated as heavy duty and designated for primary use in titanium workpieces, making it appropriate for aerospace, precision machining, and metalworking environments where material hardness demands a high-performance cutting tool. The regular spiral flute geometry with a 2.5xD flute-to-diameter ratio promotes efficient chip evacuation. It meets ANSI and NAS 907 standards, confirming dimensional and performance consistency expected by professional machinists and tool-crib managers. Sold individually, it suits single-use procurement as well as stocking applications.

Key Features

• 0.348 inch (Letter S) diameter high speed steel construction with coated finish for extended tool life
• 135-degree split point with web thinning reduces entry force and improves centering on hard materials
• Screw machine length design provides added rigidity over jobber-length bits in close-quarters setups
• Right-hand cut with regular spiral flute for efficient chip removal during through-hole drilling
• Straight-cylindrical shank compatible with standard drill chucks and screw machine collets
• Meets ANSI and NAS 907 specifications for dimensional and performance consistency

Compatibility

Designed as a heavy duty OEM-style replacement or production drill bit for use with standard drill chucks and screw machine setups accepting a straight-cylindrical shank in the 0.3000 to 0.3500 inch diameter range, conforming to ANSI and NAS 907 standards.

Installation Notes

Installation and use should be performed by qualified machinists or tooling professionals familiar with drill press, CNC, or screw machine operation. Ensure the machine is powered down and locked out before changing or seating the bit in the chuck or collet. Inspect the cutting edges and coating for wear or chipping before each use, and select appropriate feed rates and cutting speeds for titanium or other target workpiece materials per established shop practice. Coolant-through is not supported on this bit, so external coolant or cutting fluid should be applied as required by the workpiece material.