Osg 1708801 Spiral Point Tap 1/2-13 Unc Plug 3 Flute

Product Description

The OSG 1708801 is a spiral point tap designed for threading 1/2-13 UNC holes in demanding materials. It features a plug chamfer, 3 flutes, and is manufactured from powdered metal with a steam oxide coating for improved lubricity and wear resistance. The H5 thread limit and 2B class of fit make it suited for standard tolerance through-hole tapping applications. With an overall length of 3.374 inches and a thread length of 0.921 inches (1-21/32 inches), this tap is built for production environments where consistent thread quality in tough alloys is required. Right-hand thread direction is standard.

This tap is intended for use on hardened steel, stainless steel, high-nickel alloys, and titanium — materials that demand a robust cutting tool with good heat and wear characteristics. The spiral point geometry pushes chips ahead of the tap and out of the hole, making it well suited for through-hole tapping in CNC machining centers, drill presses, and tapping heads. It is a common choice for machinists and tool-and-die professionals working in aerospace, industrial manufacturing, and heavy equipment fabrication where material hardness and chip management are primary concerns.

Key Features

• Spiral point geometry pushes chips forward, reducing clogging in through-hole applications
• Powdered metal construction provides enhanced hardness and wear resistance compared to standard HSS
• Steam oxide coating improves lubricity and helps reduce galling on stainless and high-nickel alloys
• H5 thread limit with 2B class of fit for standard tolerance threaded hole production
• Rated for hardened steel, stainless steel, high-nickel alloy, and titanium material applications
• No coolant-through design; compatible with flood or brush-applied cutting fluid

Compatibility

Designed for through-hole tapping of 1/2-13 UNC threads in hardened steel, stainless steel, high-nickel alloy, and titanium workpieces. Part of the OSG Series 312NI product line.

Installation Notes

This tap should be installed and operated by a qualified machinist familiar with threading operations and cutting tool safety. Power down and lock out the machine before mounting the tap in the holder. Use an appropriate cutting fluid rated for the workpiece material — particularly important when tapping stainless steel or high-nickel alloys to prevent work hardening. Verify spindle speed and feed rate against the tool manufacturer's recommendations and workpiece material before starting the threading cycle.