Precision Twist Drill 5999924 Extra Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999924 is a high speed steel extra length drill bit designed for deep-hole drilling applications in metal fabrication, maintenance, and production environments. At 12 inches overall length with a 9-inch spiral flute, this bit reaches into cavities and deep workpieces that standard-length bits cannot access. The 0.1562-inch diameter and 118-degree standard point angle make it a general-purpose tool suited for a wide range of metalworking tasks. The uncoated HSS construction and web-thinned, tapered web configuration reduce thrust requirements and promote cleaner entry into workpiece material. Cutting direction is right hand with a regular spiral and two flutes.

This bit is intended for use in machine shop, toolroom, and field maintenance applications where extended reach is required. Primary workpiece materials include aluminum, magnesium, copper, nickel, synthetic materials, and titanium. Secondary workpiece material compatibility covers stainless steel, steel, malleable iron, nickel alloy, high strength bronze, hardened steel, magnesium alloy, reinforced plastics, and nickel. The straight-cylindrical shank seats in standard drill chucks on drill presses, CNC machining centers, and hand-held power drills. This is a Series 1290 bit manufactured to ANSI standards.

Key Features

• Extra length at 12 inches OAL with a 9-inch flute for deep-hole reach
• High speed steel construction provides durability across a broad range of metalworking materials
• 118-degree standard point angle with web-thinned tapered web reduces entry thrust
• Straight-cylindrical shank at 0.1563 inches diameter fits standard drill chucks
• Two-flute regular spiral design promotes chip evacuation in deep holes
• Uncoated finish allows for straightforward resharpening in the field

Compatibility

Designed for use with standard drill chucks accepting a straight-cylindrical shank. Compatible primary workpiece materials include aluminum, magnesium, copper, nickel, synthetic materials, and titanium. Secondary materials include stainless steel, steel, malleable iron, nickel alloy, high strength bronze, hardened steel, magnesium alloy, reinforced plastics, and nickel. Built to ANSI standards per Series 1290 specification.

Installation Notes

Install and operation should be performed by qualified machinists or trade professionals familiar with drill press, CNC, or hand-held power tool operation. Ensure the drill chuck is fully tightened and the workpiece is securely clamped before beginning any drilling operation. Due to the extended length of this bit, use the lowest practical spindle speed and apply steady, controlled feed pressure to minimize deflection and bit breakage. Always wear appropriate eye protection when drilling metal.