Precision Twist Drill 5998858 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998858 is a screw machine length drill bit designed for high-performance metal cutting in demanding shop and field applications. Built from high speed steel with a bright uncoated finish, this bit measures 0.213 inches in diameter and carries a 118-degree standard point angle. The shorter screw machine length body delivers added rigidity compared to jobber-length bits, reducing deflection and improving hole accuracy in production drilling environments. A tapered web with web thinning reduces cutting resistance at the tip, making it well suited for harder or tougher workpiece materials.

This bit is rated for use on titanium as its primary workpiece material, which makes it a capable choice for aerospace, medical, and precision machining applications where tool geometry and cutting edge integrity are critical. The right-hand spiral flute design with a 2.5xD flute-to-diameter ratio clears chips efficiently during through-hole and blind-hole operations. Machinists, toolroom technicians, and production drillers working with drill presses, CNC machines, or hand-held pneumatic drills will find this bit sized at wire gauge #3 and ready to run without additional surface preparation.

Key Features

• High speed steel construction for durability across a wide range of metals
• 118-degree standard point angle with web thinning for reduced entry force
• Screw machine length body provides extra rigidity and reduced deflection
• Bright uncoated finish suitable for use with cutting fluids
• Right-hand cut with regular spiral flute for efficient chip evacuation
• Meets ANSI standards for dimensional accuracy and tool geometry

Compatibility

Designed as a general-purpose screw machine length replacement bit in the Series R41 line, suitable for use in standard drill chucks accepting a straight cylindrical shank in the 0.2000 to 0.2500 inch diameter range.

Installation Notes

This drill bit is installed by machinists and toolroom professionals in drill press, lathe, or CNC spindle chucks that accept a straight cylindrical shank. Ensure the chuck is fully tightened and the workpiece is securely clamped before starting the cut. Use an appropriate cutting fluid when drilling titanium or other hard alloys to extend tool life and maintain surface finish. Inspect the cutting edges for wear before each use and replace the bit if the point shows chipping or rounding.