Precision Twist Drill 5998404 Jobber Drill Bit Wire 4

Product Description

The PRECISION TWIST DRILL 5998404 is a jobber-length twist drill bit in wire gauge size 4, equivalent to 0.2090 inches in decimal diameter. Manufactured from high speed steel with a steam oxide coating, this bit is designed for general-purpose drilling in a wide range of metallic and hard materials. It features a 118-degree standard point angle, a regular spiral flute, and a web-thinned, tapered web configuration that supports clean entry and efficient chip evacuation. Overall length is 3.75 inches with a 2.5-inch flute length. Licensed trades and machining professionals will recognize this as a Series R18 geometry built to ANSI standards.

This drill bit is suited for production and maintenance drilling in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It fits standard drill chucks via its straight cylindrical shank measuring 0.2090 inches in diameter and 1.25 inches in length. The 12xD flute-to-diameter ratio makes it appropriate for moderate-depth holes up to 2.5 inches. Typical install scenarios include machine shop operations, field fabrication, and maintenance work where a reliable general-purpose HSS bit is needed without coolant-through capability.

Key Features

• Wire gauge size 4 (0.2090 inches) straight cylindrical shank for standard chuck compatibility
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust on entry
• Steam oxide coating provides corrosion resistance and mild lubricity during dry drilling
• Regular spiral flute with 2-flute design promotes efficient chip removal
• Rated for use in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Meets ANSI specification for consistent dimensional accuracy across Series R10-R15-R18

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit compatible with any standard drill chuck accepting a 0.2090-inch straight cylindrical shank. Suitable for use across Series R10, R15, and R18 applications per ANSI specification.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists, millwrights, or trade professionals familiar with proper chuck mounting and drilling procedures. Secure the shank fully in the chuck and verify concentricity before operation. When drilling stainless steel, superalloys, or titanium, use appropriate cutting fluid to extend tool life, as this bit does not support coolant-through operation. Inspect the cutting edges for wear before each use and replace if chipping or dulling is observed.