Osg 1105612908 Spiral Point Tap 1/2-13 Unc Ticn

Product Description

The OSG 1105612908 is a spiral point plug tap designed for threading operations in demanding materials including hardened steel, stainless steel, high-nickel alloys, titanium, and alloy steel. It carries a 1/2-13 UNC thread form with a 3B class of fit and H3 thread limit, making it well-suited for applications requiring close-tolerance internal threads. The tap is manufactured from powdered metal and finished with a TiCN coating to extend tool life in abrasive and work-hardening materials. With 3 flutes and a plug chamfer, it is intended for through-hole applications where chips are pushed ahead of the cutting action. Licensed machinists, toolroom technicians, and production floor operators are the typical users.

This tap is used in CNC machining centers, drill presses, and tapping machines across metalworking shops handling aerospace, automotive, and industrial fabrication work. The 1/2-13 UNC thread size is one of the most common unified coarse thread standards in North American manufacturing, making this tap a general workhorse for through-hole tapping in medium to heavy-duty components. It is part of the OSG Series 312TI line, which is engineered specifically for high-performance tapping in difficult-to-machine alloys and ferrous materials.

Key Features

• TiCN coating increases surface hardness and reduces friction for extended tool life in abrasive materials
• Powdered metal construction provides uniform grain structure for consistent cutting performance
• Plug chamfer (3-5 thread lead) optimized for through-hole tapping applications
• H3 thread limit ensures proper fit tolerance for 3B class of fit requirements
• Right-hand cutting direction, compatible with standard tapping equipment
• No coolant-through requirement simplifies tooling setup

Compatibility

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

Installation Notes

This tap should be installed in a rigid tap holder or floating tap adapter sized for the shank diameter. Always ensure the workpiece is securely fixtured and the spindle is properly aligned before beginning the tapping cycle to avoid tap breakage. Use an appropriate cutting fluid or tapping compound rated for the workpiece material, particularly when threading stainless steel or titanium. Follow machine manufacturer guidelines and applicable shop safety procedures when operating tapping equipment.