Precision Twist Drill 5999974 9/16 in Extra Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999974 is a high-speed steel extra length drill bit engineered for deep-hole drilling applications where standard-length bits cannot reach. With a 9/16 inch diameter, a 12 inch overall length, and a 9 inch spiral flute, this bit delivers the reach and chip evacuation needed in structural, fabrication, and maintenance work. The 118-degree standard point angle suits general-purpose drilling across a broad range of materials. The bright, uncoated finish is compatible with cutting fluids and keeps the tool ready for immediate use. Licensed tradespeople and machining professionals rely on extra length bits like this when drilling through thick stock, deep frames, or stacked assemblies.

This bit is suited for drilling aluminum, magnesium, copper, nickel, synthetic materials, and titanium as primary workpiece materials. Secondary material suitability includes stainless steel, hardened steel, nickel alloys, malleable iron, high-strength bronze, magnesium alloys, and reinforced plastics. It fits production shops, HVAC contractors drilling through structural members, plumbers running pipe through framing, and electrical tradespeople pulling wire through deep assemblies. The Series 1290 designation places it in a general-purpose extra length product line designed for versatility across metal and synthetic materials.

Key Features

• 9/16 inch diameter with matching 9/16 inch straight-cylindrical shank for secure chuck grip
• 12 inch overall length with 9 inch flute provides extended reach for deep-hole applications
• 118-degree standard point angle with web-thinned, tapered web for reduced entry force
• Two-flute regular spiral design promotes consistent chip evacuation in deep holes
• High-speed steel construction with bright uncoated finish compatible with most cutting fluids
• Right-hand cutting direction, ANSI standard compliance, Series 1290 general-purpose grade

Compatibility

Fits any standard drill chuck accepting a 9/16 inch straight-cylindrical shank. Compatible primary workpiece materials include aluminum, magnesium, copper, nickel, synthetic materials, and titanium. Secondary workpiece materials include hardened steel, high-strength bronze, magnesium alloy, malleable iron, nickel alloy, reinforced plastics, stainless steel, and steel.

Installation Notes

Install the shank fully into a drill press or hand drill chuck rated for the 9/16 inch shank diameter and tighten securely before operation. Use an appropriate cutting fluid or coolant for the workpiece material to extend tool life, especially when drilling steel or stainless. Secure the workpiece firmly to prevent movement during entry and exit, and reduce feed pressure near breakthrough to avoid bit grab. Inspect the cutting edges before use and replace the bit if chipping or dullness is observed.