Precision Twist Drill 5999811 Extra Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999811 is a high speed steel extra length drill bit built for deep-hole drilling applications in metalworking and industrial environments. At 1 inch in diameter with a 15-inch overall length and an 11-inch spiral flute, this bit reaches depths that standard-length drill bits cannot. The uncoated HSS construction provides reliable performance across a broad range of workpiece materials. A web-thinned, tapered web design reduces thrust load at the point and improves chip evacuation. This bit is intended for use by machinists, maintenance technicians, and fabrication professionals working on production or job-shop equipment.

This extra length drill bit is suited for through-hole and deep-hole drilling in applications where extended reach is required, such as structural fabrication, mechanical assembly, and maintenance drilling. Primary workpiece materials include aluminum, magnesium, copper, nickel, synthetic materials, and titanium. Secondary workpiece materials include stainless steel, steel, nickel alloys, malleable iron, hardened steel, high strength bronze, magnesium alloy, and reinforced plastics. The straight-cylindrical shank seats in standard drill chucks and milling machine spindles with a 1-inch capacity.

Key Features

• 1 inch diameter with 15-inch overall length for deep-hole reach
• 11-inch spiral flute length promotes efficient chip removal
• Uncoated high speed steel construction for general-purpose metalworking
• Web-thinned tapered web reduces cutting thrust and improves point penetration
• 118-degree standard point angle suitable for a wide range of metals
• Right-hand cutting direction with regular spiral; Series 1511 designation
• Meets ANSI standards for dimensional consistency

Compatibility

Designed as a general-purpose extra length drill bit compatible with drill presses, lathes, and milling machines equipped with a 1-inch straight-cylindrical shank capacity. Rated for primary use in aluminum, magnesium, copper, nickel, synthetic, and titanium workpieces, with secondary suitability in stainless steel, alloy steel, malleable iron, and reinforced plastics.

Installation Notes

This bit is installed and operated by machinists and metalworking technicians following standard machine tool setup procedures. Secure the straight-cylindrical shank firmly in a properly sized drill chuck or collet before operation. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve hole quality, particularly when drilling stainless steel or nickel alloys.