Osg 1432008 Spiral Flute Tap 1/2-13 Unc Hss Ticn

Product Description

The OSG 1432008 is a spiral flute tap designed for cutting 1/2-13 UNC internal threads in a range of metals. Manufactured from high-speed steel with a TiCN coating, it delivers improved wear resistance and heat reduction compared to uncoated HSS tooling. The plug chamfer configuration provides a gradual thread lead-in, making it well suited for through-hole tapping applications. With a 50-degree helix angle and 3 right-hand spiral flutes, the tool efficiently evacuates chips upward out of the hole, reducing the risk of chip packing. It carries an H3 thread limit and a 3B class of fit, meeting standard tolerance requirements for most general-purpose threaded connections. Overall length is 3-3/8 inches.

This tap is designed for tapping through holes in a variety of materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The spiral flute geometry makes it especially effective in materials that produce long, stringy chips. It is a practical choice for production machining, job-shop work, and maintenance applications where 1/2-13 UNC threads are required. The TiCN coating extends tool life in abrasive materials and contributes to cleaner thread form across higher-volume runs.

Key Features

• 1/2-13 UNC thread form with 3B class of fit and H3 thread limit
• 3 right-hand spiral flutes at 50-degree helix angle for upward chip evacuation in through-hole applications
• TiCN coating for increased surface hardness and wear resistance versus uncoated HSS
• Plug chamfer for gradual thread engagement and lead-in
• High-speed steel construction suitable for aluminum, cast iron, and carbon steel grades
• No coolant-through requirement — compatible with flood or manual lubrication

Compatibility

Designed for tapping 1/2-13 UNC through holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. Part of OSG Series 107.

Installation Notes

Installation is performed by machinists using a tapping machine, drill press, or CNC machining center with appropriate tap holders. Ensure the pilot hole is drilled to the correct tap drill diameter for 1/2-13 UNC before tapping. Apply a suitable cutting fluid or tapping compound for the workpiece material to reduce friction and extend tool life. Inspect threads with a 3B class GO/NO-GO gauge after tapping to confirm dimensional compliance.