Precision Twist Drill 5998826 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998826 is a screw machine length drill bit designed for high-performance metal drilling applications. It measures 0.159 inches (Wire Size #21) in diameter with an overall length of 2.125 inches and a flute length of 1.0625 inches. The bit is manufactured from high speed steel with a bright uncoated finish and features a 118-degree standard point angle. A web-thinned, tapered web configuration reduces thrust during entry, making it well suited for production drilling in tight-tolerance environments. This drill bit is sold individually and conforms to ANSI standards.

This bit is intended for use in screw machine operations, CNC drilling, and general-purpose machining applications where a shorter flute-to-diameter ratio improves rigidity and reduces deflection. The 2.5xD flute-by-diameter ratio and regular spiral type are well matched to through-hole drilling in titanium and other demanding primary workpiece materials. It is typically installed in machine spindles, drill presses, and hand-held power tools by machinists and metalworking tradespeople. The straight cylindrical shank provides broad compatibility with standard drill chucks.

Key Features

• Screw machine length body provides added rigidity and reduced deflection compared to jobber-length bits
• High speed steel construction handles elevated cutting temperatures in metalworking applications
• Web-thinned, tapered web lowers cutting thrust and improves chip evacuation at entry
• 118-degree standard point angle suits a wide range of ferrous and non-ferrous materials
• Bright uncoated finish allows easy visual inspection of cutting edge condition
• Right-hand cut, spiral flute design for conventional clockwise spindle operation

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for screw machine and short-length drilling applications requiring a 0.159-inch diameter, Wire Size #21 bit with a straight cylindrical shank.

Installation Notes

This drill bit is installed by machinists and metalworking professionals using a standard drill chuck or collet rated for straight cylindrical shanks. Ensure the spindle is fully stopped and de-energized before changing tooling. Secure the shank firmly in the chuck to the full depth of the chuck jaws to prevent slippage during cutting. Follow shop safety protocols and applicable ANSI machining standards when setting feeds and speeds for the workpiece material.