Precision Twist Drill 5998562 59/64 in Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998562 is a screw machine length drill bit designed for high-performance metal removal in demanding shop and field applications. Built from high speed steel with a coated finish, it measures 0.9219 inches (59/64 inch) in diameter and features a standard 118-degree point angle with web thinning for reduced thrust and easier penetration. The straight-cylindrical shank seats securely in standard drill chucks. At 5.75 inches overall length with a 3.75-inch flute, this stub-length bit offers added rigidity compared to jobber-length alternatives, making it well suited for machinists, toolroom techs, and maintenance professionals working in tight setups.

This bit is rated for primary use on titanium and is built to ANSI standards under the Series R40 platform. The regular spiral flute with a 2.5xD flute-to-diameter ratio provides efficient chip evacuation during deep passes. Coolant-through capability is not included, so conventional flood or mist coolant applied externally is the standard approach. It is appropriate for use in CNC machining centers, manual mills, drill presses, and heavy-duty hand drilling operations where a stubby, rigid bit profile is preferred over jobber length.

Key Features

• 59/64 inch (0.9219 inches) diameter, screw machine (stub) length for increased rigidity
• High speed steel construction with coated finish for extended tool life
• 118-degree standard point angle with web thinning to reduce entry thrust
• Right-hand cut, regular spiral flute with tapered web configuration
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Built to ANSI standards, Series R40, rated for titanium and general-purpose materials

Compatibility

Designed as an OEM-style replacement or direct-use screw machine length drill bit for applications requiring a straight-cylindrical shank and 59/64 inch bore diameter in ANSI-compliant tooling setups.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard drill chucks, end mill holders, or collet systems rated for the shank diameter. Secure the shank fully in the chuck or collet before engaging power. When drilling titanium or hard alloys, apply appropriate external coolant or cutting fluid to manage heat buildup and extend tool life. Inspect the cutting edges and web condition before each use and replace the bit if chipping or excessive wear is observed.