Precision Twist Drill 5998568 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998568 is a screw machine length drill bit designed for high-performance metal cutting in production and maintenance environments. Built from high speed steel with a coated finish, this bit measures 0.9844 inches (63/64 inch) in diameter with an overall length of 6 inches and a flute length of 4 inches. The 118-degree standard point angle and web-thinned, tapered web configuration reduce thrust and improve chip evacuation. Right-hand spiral flute geometry with a 2.5xD flute-to-diameter ratio keeps the cut clean and consistent. Licensed trades and production machinists rely on this bit for demanding applications where precision bore size and tool life matter.

This drill bit is suited for screw machine operations and general-purpose drilling where a shorter, more rigid tool length is needed. Its primary workpiece material rating is titanium, making it appropriate for hard-metal and high-strength alloy drilling as well as general ferrous and non-ferrous applications. The straight-cylindrical shank fits standard drill chucks without additional adapters. Series R40 is built to ANSI standards for consistent dimensional accuracy across the production line.

Key Features

• 63/64 inch (0.9844 inches) diameter with screw machine length profile for added rigidity
• High speed steel construction with coated finish for extended wear resistance
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Right-hand spiral flute with 2.5xD flute-to-diameter ratio for efficient chip removal
• Straight-cylindrical shank for direct chuck mounting without adapters
• Built to ANSI standards under Series R40 for dimensional consistency

Compatibility

Designed as an OEM-style screw machine length drill bit compatible with standard drill chucks accepting a straight-cylindrical shank at 0.9844 inches diameter. Primary workpiece material rating is titanium; also suited for general-purpose drilling in ferrous and non-ferrous metals per ANSI Series R40 specifications.

Installation Notes

Installation and use should be performed by qualified machinists or tool-and-die professionals familiar with proper spindle speed and feed rate selection for the workpiece material. Secure the straight-cylindrical shank firmly in a properly sized chuck before operation. Inspect the cutting edges and coating condition before each use; a damaged or dull bit should be replaced or professionally resharpened. Follow applicable shop safety procedures, including the use of appropriate cutting fluid where required by the workpiece material.