Precision Twist Drill 5999301 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999301 is a screw machine length drill bit designed for high-speed steel cutting in tight-clearance and production drilling applications. Measuring 0.041 inches in diameter with an overall length of 1.375 inches and a flute length of 0.5 inches, this bit operates with a 118-degree standard point angle and a web-thinned, tapered web configuration for improved penetration and reduced thrust. The bright/uncoated finish suits general-purpose use across a range of ferrous and non-ferrous materials, including titanium. It is installed and used by machinists, tool-and-die technicians, and precision fabricators working in production or maintenance environments.

This drill bit is built for screw machine length applications where a shorter body provides added rigidity and reduced deflection compared to jobber-length bits. The Series R41 designation places it within a high-performance line conforming to ANSI standards. Its compact 1.375-inch overall length makes it well suited for CNC drilling, turret lathes, screw machines, and bench drill press work where workpiece clearance or chuck depth is limited. The 2.5xD flute-to-diameter ratio supports efficient chip evacuation in short-cycle, repetitive drilling operations.

Key Features

• 0.041-inch diameter, wire gauge size 59, for fine-tolerance drilling
• 118-degree standard point angle with web thinning for reduced entry force
• High speed steel construction rated for general-purpose and titanium workpieces
• Screw machine length body (1.375 inches overall) for added rigidity and reduced runout
• Right-hand cut, spiral flute, straight-cylindrical shank for standard chuck compatibility
• Bright/uncoated finish; no coolant-through requirement
• Conforms to ANSI standards; Series R41 high-performance designation

Compatibility

Designed as an OEM-style screw machine length drill bit compatible with standard straight-shank drill chucks used in CNC machines, turret lathes, screw machines, and bench drill presses. Suited for drilling titanium and general-purpose workpiece materials per Series R41 ANSI specifications.

Installation Notes

Install in a standard straight-shank chuck and verify concentricity before use to minimize deflection at this small diameter. Power down all equipment before changing bits. At 0.041 inches in diameter, excessive feed pressure will cause bit breakage — use appropriate low-feed, high-speed parameters for the workpiece material. Follow applicable machine guarding and PPE requirements per shop safety standards.