Precision Twist Drill 5998708 Jobber Drill Bit 21/64 in

Product Description

The PRECISION TWIST DRILL 5998708 is a jobber-length drill bit designed for general-purpose drilling in a wide range of materials. Built from high speed steel with a steam oxide coating, it measures 21/64 inches (0.3281 inches) in diameter with an overall length of 4.625 inches. The 118-degree standard point angle provides reliable starting without the need for a center punch in most applications. The web-thinned, tapered web construction reduces thrust and improves chip clearance, making it a practical choice for production and maintenance drilling alike. This bit is turned by hand in a right-hand direction and features a two-flute regular spiral configuration. It is sold individually and conforms to ANSI standards.

This drill bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. It fits standard drill chucks via its straight-cylindrical shank. The Series R10 designation places it in a broad family of jobber-length bits used across industrial maintenance, fabrication shops, mechanical contracting, and HVAC or plumbing rough-in work where precise hole sizing is required. The 3.3125-inch flute length supports a maximum drilling depth of 3.3125 inches, making it appropriate for through-holes in standard structural and sheet material stock.

Key Features

• High speed steel construction with steam oxide coating for corrosion resistance and reduced friction
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust
• Two-flute regular spiral design promotes efficient chip evacuation
• Right-hand cut with straight-cylindrical shank fits standard 3-jaw drill chucks
• 3.3125-inch flute length supports drilling depths up to 3.3125 inches
• Conforms to ANSI standards; Series R10 general-purpose grade

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard drill chuck accepting a 21/64-inch (0.3281-inch) straight-cylindrical shank. Suitable for use in handheld drills, drill presses, and CNC drilling operations on steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium.

Installation Notes

Install in a properly sized drill chuck and tighten securely with a chuck key before operation. Power down or de-energize all equipment before changing bits. Use appropriate cutting fluid or coolant when drilling hard materials such as stainless steel or superalloys to extend tool life and maintain hole quality. Wear appropriate eye protection and follow applicable shop safety requirements when operating drilling equipment.