Precision Twist Drill 5999396 Drill Bit Letter S Hss

Product Description

The PRECISION TWIST DRILL 5999396 is a jobber-length drill bit sized to letter S, equivalent to 0.3480 inches in decimal diameter. It is manufactured from high-speed steel with a steam oxide coating that reduces friction and provides light corrosion resistance during storage and use. The bit features a 118-degree standard point angle, a right-hand spiral flute, and a straight-cylindrical shank sized at 0.3480 inches. Overall length is 4.875 inches with a flute length of 3.5 inches. It is designed for general-purpose drilling applications and is installed by machinists, maintenance technicians, and trade professionals working with drill presses, lathes, and hand-held power drills.

This drill bit is suited for production and maintenance drilling in a wide range of materials including steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The regular spiral and tapered web configuration with web thinning make it capable in both light and moderate-duty drilling scenarios. It is commonly used in HVAC, plumbing, and electrical trade work where accurate hole sizing to a letter-S diameter is required in metal fabrication or equipment installation tasks.

Key Features

• Letter S size, 0.3480 inches decimal diameter for precise hole sizing
• 118-degree standard point angle for general-purpose entry into multiple metal types
• Steam oxide coating reduces friction and provides light corrosion resistance
• Web-thinned, tapered web construction reduces thrust and improves chip evacuation
• Right-hand cut with regular spiral flute, 2-flute configuration
• Straight-cylindrical shank compatible with standard drill chucks

Compatibility

Designed as a general-purpose jobber-length drill bit in Series R10-R15-R18, conforming to ANSI standards, and compatible with any standard drill chuck accepting a 0.3480-inch straight-cylindrical shank.

Installation Notes

Secure the shank fully in the drill chuck before use and verify chuck key removal prior to starting the machine. Always wear appropriate eye protection when drilling metal. Maximum drilling depth for this bit is 3.5 inches; avoid exceeding this depth to prevent bit deflection or breakage. No coolant-through capability is present, so use appropriate cutting fluid externally when drilling hard or heat-sensitive materials.