Precision Twist Drill 5998533 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998533 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from coated high speed steel with a 135-degree split point and web-thinned tip, this bit starts precisely without walking and cuts aggressively through tough materials. At 0.1405 inches in diameter and 1-15/16 inches overall length, the compact screw machine format provides added rigidity compared to jobber-length bits, making it well suited for short-reach drilling on production machinery, lathes, and drill presses. The straight-cylindrical shank seats securely in standard chucks. This is a heavy duty, high performance tool meeting ANSI and NAS 907 specifications.

This drill bit is rated for use in titanium as its primary workpiece material, making it appropriate for aerospace, medical fabrication, and precision machining environments where standard bits lose their edge prematurely. The regular spiral flute with a 2.5xD flute-to-diameter ratio provides efficient chip evacuation during short-stroke operations. Machinists, toolroom technicians, and production operators working with ferrous and non-ferrous hard metals will find this bit fits standard production workflows. It is sold individually but requires a minimum order of 12 units per purchase.

Key Features

• 0.1405 inch diameter, Wire Size No. 28, screw machine length for rigid, close-tolerance drilling
• 135-degree split point with web thinning for self-starting entry and reduced thrust force
• Coated high speed steel construction rated for titanium and other hard materials
• Regular spiral flute at 2.5xD ratio for controlled chip evacuation in short-stroke applications
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Meets ANSI and NAS 907 specifications for heavy duty, high performance tooling

Compatibility

Designed as a screw machine length drill bit for use in drill presses, CNC machining centers, lathes, and production drilling fixtures accepting a straight-cylindrical shank in the 0.1000 to 0.1500 inch diameter range.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom personnel familiar with proper chuck-mounting procedures and cutting speeds for high speed steel tooling. Ensure the machine is fully stopped and de-energized before changing or inspecting bits. Secure the shank fully within the chuck or collet to the recommended engagement depth to prevent runout. Do not exceed the recommended cutting speed and feed rate for the workpiece material being drilled.