Precision Twist Drill 5998813 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998813 is a screw machine length drill bit designed for high-performance metal cutting in demanding trade and industrial applications. It carries a 0.1695-inch diameter (Wire Size 18) with a 118-degree standard point angle and is manufactured from high speed steel with a bright, uncoated finish. The overall length is 2-1/8 inches with a 1-1/16-inch flute length, making it a compact stub-length bit suited for short-reach, high-accuracy drilling. A tapered web configuration with web thinning reduces thrust and supports cleaner entry cuts. It is installed by machinists, tool-and-die professionals, and maintenance mechanics working with drill presses, CNC machines, and hand-held power tools.

This bit is rated for use on titanium as its primary workpiece material and performs across a general-purpose range of 0.1500 to 0.2000 inches in decimal diameter equivalents. The screw machine length (stub) design gives the bit added rigidity over jobber-length bits, making it a preferred choice in production drilling, sheet metal work, and close-tolerance fixture setups where bit flex and deflection must be minimized. The right-hand spiral flute efficiently evacuates chips during the cut. It meets ANSI standards and carries a 2.5xD flute-to-diameter ratio.

Key Features

• 0.1695-inch diameter, Wire Size 18, for precise hole sizing
• 118-degree standard point angle with web thinning for reduced entry thrust
• High speed steel construction handles titanium and general-purpose metals
• Screw machine (stub) length adds rigidity and reduces deflection
• Bright, uncoated finish — compatible with cutting fluids and coolants
• Right-hand spiral flute with tapered web for efficient chip evacuation
• Meets ANSI standards; Series R41

Compatibility

Designed as a general-purpose screw machine length drill bit suitable for use in standard straight-shank drill chucks on drill presses, lathes, milling machines, and hand-held power drills rated for the 0.1695-inch diameter range.

Installation Notes

This bit is installed by machinists and maintenance professionals using standard three-jaw or collet-style chucks that accept a straight cylindrical shank. Secure the shank fully in the chuck before operation and verify chuck tightness before engaging the spindle. Use appropriate cutting fluid or coolant when drilling titanium or hard alloys to extend tool life and maintain dimensional accuracy. Inspect the bit for wear or chipping at the cutting edges before each use and replace when point geometry is compromised.