Osg 2881200 Spiral Point Tap 1/2-13 Unc 3 Flute Hss

Product Description

The OSG 2881200 is a spiral point tap designed for threading 1/2-13 UNC through-holes in production and maintenance machining environments. It features a plug chamfer, three flutes, and a bright high-speed steel construction. The spiral point geometry pushes chips forward ahead of the cut, making it well suited for through-hole tapping where chip evacuation is critical. With an overall length of 3.375 inches and a thread length of 1-21/32 inches, this tap handles standard depth applications without extended reach tooling. Machinists and tool room technicians working with ferrous and non-ferrous materials reach for this tap when a reliable, cost-effective threading solution is needed.

This tap is rated for right-hand threads in a 3B class of fit, which meets standard tolerance requirements for general-purpose fastener applications. Material applications include aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. It is used in job shops, manufacturing facilities, and maintenance operations where 1/2-13 UNC threading is performed on drill presses, CNC machining centers, and manual tapping fixtures. Coolant-through capability is not included, so standard flood or brush-applied cutting fluid is recommended for steel applications.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole threading
• Plug chamfer provides gradual thread entry and reduced starting torque
• High-speed steel construction handles aluminum and low-to-medium carbon steel
• 3B class of fit meets standard general-purpose thread tolerance requirements
• Bright finish with no oversize compensation, suitable for standard tolerance work
• Right-hand thread direction compatible with standard tapping equipment

Compatibility

Designed for through-hole tapping of 1/2-13 UNC threads in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel workpieces. Compatible with standard tap holders and tapping heads sized for a 0.367-inch shank diameter.

Installation Notes

Tapping operations should be performed by a qualified machinist following established speeds and feeds for the workpiece material. Secure the workpiece firmly before beginning the threading operation and ensure the tap is properly aligned to avoid cross-threading or tap breakage. Apply an appropriate cutting fluid for the material being tapped, particularly with steel. Inspect the tap for wear or chipping before each use and replace when thread quality degrades.