Osg 2842401 Spiral Point Plug Tap 1/2-13 Unc 3 Flute

Product Description

The OSG 2842401 is a spiral point plug tap designed for right-hand threading in a 1/2-13 UNC thread form. It is manufactured from vanadium high-speed steel (HSS-E) and finished with a steam oxide coating that reduces friction and helps resist corrosion during cutting. With 3 flutes and an H5 thread limit, this tap is built for production tapping where chips need to be pushed forward ahead of the cutting zone. It meets a 2B class of fit, which is the standard tolerance range for general-purpose threaded fastener assemblies. Machinists and tool-and-die technicians use this tap in both hand and machine tapping applications.

This tap is suited for through-hole tapping operations across a wide range of materials. The HSS-E construction and oxide finish support use in aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, and cast iron. The plug chamfer style provides a gradual lead-in that distributes cutting load across the first several threads, making it a practical choice for production runs and CNC tapping centers in light manufacturing and machine shop environments.

Key Features

• 1/2-13 UNC thread form with right-hand cutting direction
• 3-flute spiral point design pushes chips forward for through-hole applications
• H5 thread limit for precise 2B class of fit tolerances
• Vanadium high-speed steel (HSS-E) construction for extended tool life in ferrous and non-ferrous materials
• Steam oxide coating reduces friction and provides light corrosion resistance
• Plug chamfer distributes cutting load gradually for smooth thread entry

Compatibility

Designed as a standard spiral point plug tap for through-hole tapping in 1/2-13 UNC applications. Compatible with materials including aluminum, hardened steel, stainless steel, high-carbon steel, low-carbon steel, medium-carbon steel, alloy steel, die steel, and cast iron.

Installation Notes

This tap should be installed and used by machinists or tool-and-die technicians familiar with machine and hand tapping procedures. Ensure the workpiece is securely fixtured and the correct tap drill size for 1/2-13 UNC is used before tapping. Apply appropriate cutting fluid for the workpiece material to extend tool life and maintain thread quality. Inspect the tap for wear or chipping before each use and replace if cutting edge integrity is compromised.