Precision Twist Drill 5998594 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998594 is a screw machine length drill bit engineered for high-performance drilling in demanding trade and production environments. It measures 0.089 inches in diameter with an overall length of 1.75 inches and a flute length of 0.75 inches. The bit is manufactured from high speed steel with a coated finish and features a 135-degree split point with web thinning for fast, accurate starts. The straight-cylindrical shank seats securely in standard chucks, and the regular spiral flute profile promotes efficient chip evacuation during operation. This is a single-piece package sold in multiples of 12.

The 5998594 is suited for screw machine, production drilling, and precision hole-making applications where a short, rigid bit length is preferred to minimize deflection. Its primary workpiece material rating is titanium, making it appropriate for aerospace, MRO, and industrial fabrication contexts where hard or abrasive materials are encountered. The 2.5xD flute-to-diameter ratio supports controlled cutting in both manual and CNC drill press setups. Licensed machinists, toolroom technicians, and industrial tradespeople are the typical installers and end users.

Key Features

• High speed steel construction with coated finish for extended tool life
• 135-degree split point with web thinning reduces walking and entry force
• Screw machine length body minimizes deflection in short-reach applications
• Right-hand cut, regular spiral flute for consistent chip clearance
• Straight-cylindrical shank fits standard drill chucks without adapters
• Meets ANSI and NAS 907 standards for dimensional and performance consistency

Compatibility

Designed as an OEM-style replacement and production drill bit for use in standard straight-shank drill chucks across screw machine, drill press, and CNC drilling operations where a 0.089-inch diameter, screw machine length bit is specified.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom technicians familiar with drill press and CNC equipment operation. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit from the chuck. Secure the shank fully in the chuck jaws and verify runout before engaging the workpiece. Do not exceed the recommended speed and feed parameters for the workpiece material being drilled.