Precision Twist Drill 5998629 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998629 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from high speed steel with a bright, uncoated finish, this bit measures 19/32 inch (0.5938 inches) in diameter and features a 118-degree standard point angle with web thinning for reduced thrust and cleaner entry. The straight-cylindrical shank seats securely in standard drill chucks. At 4.125 inches overall length with a 2.625-inch spiral flute, it fits compact drilling setups where a jobber-length bit would be impractical.

This Series R40 screw machine drill bit is rated for high-performance use and carries an ANSI specification designation. It is suited for drilling titanium as the primary workpiece material, making it appropriate for aerospace, maintenance, and precision machining environments. The regular spiral flute pattern and tapered web configuration promote chip evacuation and help maintain hole geometry. Machinists, tool and die technicians, and maintenance tradespeople working with hard metals will find this bit appropriate for production and repair drilling tasks requiring consistent accuracy in the 0.5000 to 0.6000 inch diameter range.

Key Features

• 19/32 inch (0.5938 inches) diameter, screw machine length for compact clearance drilling
• 118-degree standard point angle with web thinning reduces entry thrust
• High speed steel construction handles titanium and other difficult workpiece materials
• Regular spiral flute with 2.5xD flute-to-diameter ratio promotes chip clearance
• Straight-cylindrical shank fits standard drill chucks without adapters
• Bright, uncoated finish — ANSI-rated, general purpose grade

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for applications requiring a 0.5938-inch diameter hole in the 0.5000 to 0.6000 inch size range, conforming to ANSI standards for screw machine length drill bits.

Installation Notes

Installation is performed by machinists and maintenance technicians using standard drill presses, CNC machines, or hand-held power tools with a compatible chuck. Ensure the workpiece is properly secured before drilling and that drill speed and feed rate are appropriate for the workpiece material. Coolant through is not supported on this bit, so use external cutting fluid when drilling titanium or other hard metals to extend tool life and prevent work hardening. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed.