Precision Twist Drill 5998541 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998541 is a screw machine length drill bit designed for high-performance drilling in metalworking and machining applications. Built from high speed steel with a coated finish, this bit features a 0.7969 inch (51/64 inch) diameter, a 118-degree standard point angle, and a straight-cylindrical shank for secure chuck engagement. The web-thinned, tapered web design reduces thrust and improves chip evacuation. At 5.25 inches overall length with a 3.375-inch spiral flute, it delivers a compact, rigid profile suited for screw machine and short-hole drilling work. Weighing 0.5 pounds, it is built for repetitive production use in machine shops and fabrication environments.

This drill bit is suited for drilling titanium and other demanding primary workpiece materials where a high performance, ANSI-compliant tool is required. The Series R40 designation places it in a proven product line engineered for general purpose metal cutting. The 2.5xD flute-to-diameter ratio supports chip clearance in shorter drilling cycles typical of screw machine operations. Licensed machinists, tool-and-die technicians, and CNC setup operators are the primary installers and users of this bit in production and job shop settings.

Key Features

• 0.7969 inch (51/64 inch) diameter with a 118-degree standard point angle for positive entry and clean hole initiation
• High speed steel construction with a coated finish for extended tool life in ferrous and non-ferrous materials
• Web-thinned, tapered web design reduces cutting thrust and improves chip flow
• Screw machine length body (5.25 inches overall) provides added rigidity compared to jobber-length bits
• Right-hand cut, regular spiral flute configuration for standard CNC and manual machine spindles
• ANSI-compliant Series R40 construction for consistent dimensional tolerances

Compatibility

Designed as an OEM-style replacement or direct addition for screw machine and drill press setups requiring a straight-cylindrical shank drill bit in the 0.6000 inch and above diameter range, conforming to ANSI standards.

Installation Notes

This bit is installed by machinists and CNC operators into standard drill chucks or collet systems accepting straight-cylindrical shanks. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify chuck or collet runout is within acceptable limits before beginning a production run to avoid premature edge wear. Follow shop-standard speeds and feeds for the workpiece material, and use appropriate cutting fluid when drilling titanium or hardened alloys.