Precision Twist Drill 5998771 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998771 is a screw machine length drill bit designed for high-performance drilling in metal fabrication and machining applications. Built from high speed steel (HSS) with a bright/uncoated finish, this bit measures 0.228 inches in diameter with an overall length of 2-7/16 inches and a flute length of 1-5/16 inches. The 118-degree standard point angle and web-thinned, tapered web configuration reduce entry force and improve chip clearance. At 0.04167 pounds, it is a compact, lightweight tool suited for screw machine work and short-hole drilling on the benchtop or in production environments.

This drill bit is built for right-hand cutting with a regular spiral flute pattern and a straight-cylindrical shank for secure chuck retention. The Series R41 designation places it in a line designed for general-purpose high-performance drilling. It is rated for use on titanium as the primary workpiece material, making it appropriate for aerospace, industrial maintenance, and precision metalworking tasks where tool integrity and dimensional accuracy are critical. The 2.5xD flute-to-diameter ratio supports efficient chip evacuation in short-hole applications. Licensed machinists, tool-and-die technicians, and industrial maintenance mechanics are the primary users.

Key Features

• 0.228 inch (wire size No. 1) diameter with tight decimal tolerance for precision hole sizing
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust and improved centering
• High speed steel construction rated for drilling titanium and other demanding metals
• Screw machine length body at 2-7/16 inches overall for use in tight clearance setups
• Bright/uncoated finish suitable for use with cutting fluids in general-purpose applications
• Right-hand cut, regular spiral flute with straight-cylindrical shank for standard chuck compatibility

Compatibility

Designed as an OEM-style screw machine length drill bit conforming to ANSI standards, suitable for use in any standard drill chuck or screw machine accepting a straight-cylindrical shank in the 0.200 to 0.250 inch diameter range.

Installation Notes

Install in a compatible drill chuck or collet rated for the shank diameter and tighten securely before operation. Always power down and de-energize the drilling machine before changing bits. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain hole quality. Follow shop safety protocols and applicable ANSI machining standards during setup and operation.