Precision Twist Drill 5998586 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998586 is a screw machine length drill bit engineered for high-performance drilling in demanding trade and industrial applications. Built from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned geometry that reduces walking and cutting resistance on entry. The straight-cylindrical shank provides consistent chuck grip, and the regular spiral flute with a 2.5xD flute-to-diameter ratio promotes efficient chip evacuation. At 0.098 inches in diameter (wire size #40), it is a short-length tool intended for precision hole production where rigidity and accuracy matter. Licensed HVAC, mechanical, and industrial trades will find this bit suited to close-tolerance work.

This screw machine length bit is designed for use in drill presses, CNC machining centers, and hand-held power tools where a rigid, stub-length drill is required. Its primary workpiece material rating is titanium, though the high speed steel construction and heavy-duty grade make it appropriate for a range of ferrous and non-ferrous materials in sheet metal, mechanical assembly, and component fabrication scenarios. The short overall length of 1-13/16 inches reduces deflection in tight clearance areas. The R41C series targets high-performance production drilling environments where consistency across multiple holes is critical.

Key Features

• 135-degree split point reduces drill walking and lowers thrust force on entry
• Web-thinned, tapered web configuration improves chip clearance and cutting efficiency
• High speed steel construction with coated finish for extended tool life
• Screw machine (stub) length at 1-13/16 inches overall for maximum rigidity
• Right-hand cut with regular spiral flute and 2.5xD flute ratio for reliable chip evacuation
• Meets ANSI and NAS 907 standards for dimensional and performance consistency

Compatibility

Designed as a direct-fit screw machine length drill bit for standard straight-shank drill chucks in drill presses, CNC machines, and power hand tools. Rated for titanium as the primary workpiece material per ANSI and NAS 907 specifications under the R41C series.

Installation Notes

Secure the straight-cylindrical shank firmly in a keyed or keyless chuck before operation. Ensure the machine spindle is at a full stop before inserting or removing the bit. Use appropriate cutting fluid when drilling titanium or hardened materials to manage heat and extend tool life. Always wear eye protection and follow applicable ANSI safety standards when operating rotary cutting tools.