Precision Twist Drill 5998591 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998591 is a screw machine length drill bit engineered for high-performance drilling in tight spaces and production environments. Manufactured from high speed steel with a coated finish, it delivers extended tool life under demanding conditions. The bit measures 0.0935 inches in diameter with an overall length of 1.75 inches and a flute length of 0.75 inches. The 135-degree split point reduces walking on entry and lowers thrust requirements. A web-thinned, tapered web configuration improves chip evacuation and cutting efficiency. Licensed HVAC techs, machinists, and production drill operators rely on this series for consistent, repeatable hole quality in high-volume applications.

This screw machine drill bit is suited for drilling titanium and other demanding workpiece materials where a standard jobber-length bit is too long for the application or fixturing setup. The shorter flute-to-diameter ratio of 2.5xD makes it well-suited for CNC machining centers, drill presses, and hand-held power tools in production or maintenance settings. The R41C series meets ANSI and NAS 907 standards, making it appropriate for aerospace, industrial, and general trade applications where specification compliance is required. Wire size designation is No. 42.

Key Features

• 135-degree split point reduces entry walking and cutting thrust
• Web-thinned tapered web improves chip flow and reduces heat buildup
• High speed steel construction with coated finish for extended tool life
• Screw machine length body for use in confined spaces and short-reach setups
• Right-hand spiral flute cut with straight-cylindrical shank for standard chuck compatibility
• Meets ANSI and NAS 907 specifications for dimensional and performance compliance

Compatibility

Designed for use in standard 3-jaw drill chucks and collets accepting a straight-cylindrical shank. Primary workpiece material is titanium; the coated high speed steel construction is appropriate for other non-ferrous and ferrous metals in screw machine and CNC drilling operations. Sold individually; minimum order quantity is 12 units.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with drill press or CNC tooling setup. Secure the shank fully in the chuck or collet before operation and verify runout before drilling. Use appropriate cutting fluid for titanium and hard-metal workpieces to manage heat and extend tool life. Inspect the cutting edge before each use and replace bits showing chipping or wear to maintain hole quality and avoid workpiece damage.