Precision Twist Drill 5999969 7/16 in Extra Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999969 is a 7/16-inch diameter extra length drill bit engineered for deep-hole drilling applications where standard-length bits fall short. Built from high-speed steel with a bright uncoated finish, this bit features a 12-inch overall length and a 9-inch spiral flute that clears chips efficiently during extended cuts. The 118-degree standard point angle and web-thinned, tapered web configuration reduce entry force and improve centering on the workpiece. Right-hand cutting direction with a two-flute, regular spiral design makes this bit a reliable choice for machinists, pipefitters, and HVAC technicians drilling through structural members, plates, or deep fabrications.

This extra length bit is suited for both production and maintenance drilling where access is restricted or hole depth exceeds standard bit reach. Primary workpiece materials include aluminum, magnesium, copper, nickel, synthetic materials, and titanium. Secondary applications cover hardened steel, stainless steel, nickel alloys, malleable iron, high-strength bronze, magnesium alloy, and reinforced plastics. The straight-cylindrical shank seats securely in standard three-jaw chucks and compatible collet systems without requiring adapters in most setups. Series 1290 construction meets ANSI standards for general-purpose drilling across light industrial and trade applications.

Key Features

• 7/16-inch diameter with 12-inch overall length for deep-reach drilling
• 9-inch spiral flute length promotes efficient chip evacuation on long passes
• 118-degree standard point angle with web-thinned tapered web reduces thrust and improves centering
• High-speed steel construction handles a wide range of ferrous and non-ferrous workpiece materials
• Straight-cylindrical shank fits standard drill chucks and collet holders
• Right-hand, two-flute regular spiral design; ANSI-compliant Series 1290

Compatibility

Designed for use in standard three-jaw drill chucks and collet systems accepting a 7/16-inch straight-cylindrical shank. Rated for drilling aluminum, magnesium, copper, nickel, titanium, synthetic materials, stainless steel, hardened steel, nickel alloys, malleable iron, high-strength bronze, and reinforced plastics.

Installation Notes

Installation is performed by machinists, pipefitters, or qualified trade technicians using a drill press, magnetic drill, or hand-held electric drill rated for the shank diameter. Secure the workpiece firmly before drilling to prevent walking, especially given the extended length and increased leverage. Confirm chuck jaws are fully tightened on the full shank diameter before starting. Use appropriate cutting fluid for ferrous materials to maintain edge life and reduce heat buildup during deep passes.