Precision Twist Drill 5998615 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998615 is a screw machine length drill bit engineered for high-performance drilling in demanding shop and field applications. Manufactured from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned, tapered web construction to reduce walking and improve penetration on entry. The straight-cylindrical shank seats securely in standard drill chucks. At 0.073 inches in diameter (Wire Size 49), it is sized for tight-tolerance work where precision hole placement matters. It is designed to handle tough primary workpiece materials including titanium, making it a capable choice for aerospace, mechanical, and fabrication tasks.

This drill bit is built for screw machine length applications, meaning a shorter overall body that provides increased rigidity and reduced deflection compared to jobber-length bits. With an overall length of 1-11/16 inches and a flute length of 11/16 inches, the 5998615 is well suited for CNC screw machines, drill presses, and hand-held power tools where stub-length control is needed. The regular spiral flute geometry at a 2.5xD flute-to-diameter ratio promotes efficient chip evacuation in metalworking environments. Licensed tradespeople and machinists working in fabrication shops, OEM production lines, and maintenance-repair operations will find this bit a reliable everyday tool.

Key Features

• 135-degree split point reduces thrust and minimizes bit walking on hard materials
• Web-thinned tapered web improves cutting efficiency and lowers heat buildup
• High speed steel construction with coated finish for extended service life
• Screw machine (stub) length body provides superior rigidity and reduced deflection
• Right-hand cut with regular spiral flute for consistent chip evacuation
• Meets ANSI and NAS 907 standards for heavy-duty drill bit performance

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for standard straight-shank drill chucks in CNC screw machines, drill presses, and portable power tools requiring a Wire Size 49 (0.073 inch) diameter bit.

Installation Notes

Installation should be performed by qualified machinists or tradespeople familiar with rotating cutting tools. Ensure the drill chuck is fully tightened and the workpiece is securely fixtured before operation. Always wear appropriate eye protection and follow applicable shop safety protocols when operating drill equipment. Do not exceed the recommended RPM range for the bit diameter and workpiece material combination.