Osg 1217801 Spiral Point Tap 8-32 Unc 2 Flute Hss

Product Description

The OSG 1217801 is a spiral point plug tap designed for cutting 8-32 UNC internal threads in a wide range of metals. The spiral point geometry pushes chips forward ahead of the cutting action, keeping the flute area clear and reducing the risk of chip packing in through-hole applications. Built from high-speed steel with a steam oxide finish, this tap delivers consistent performance across ferrous and non-ferrous materials. With 2 flutes, an H5 thread limit, and right-hand thread direction, it suits standard production and maintenance tapping operations. Overall length is 2.125 inches with a shank diameter of 0.168 inches.

This tap is suited for through-hole tapping in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The plug chamfer style - typically 3 to 5 lead threads - makes it the standard choice for starting a tap in a pre-drilled hole where the tap can pass completely through. It fits jobs in both production shop environments and field maintenance work where 8-32 UNC fasteners are common, such as electrical enclosures, HVAC controls, and light mechanical assemblies.

Key Features

• Spiral point geometry pushes chips forward, ideal for through-hole tapping
• High-speed steel construction handles a broad range of metal hardnesses
• Steam oxide coating reduces friction and provides mild corrosion resistance during storage and use
• H5 thread limit provides slightly oversized threads for plated or tight-tolerance applications
• Plug chamfer for general-purpose through-hole starts
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed for cutting 8-32 UNC right-hand internal threads in through-hole applications across aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces.

Installation Notes

Use in a properly sized drill press, CNC machine, or hand tap handle with appropriate cutting fluid for the material being tapped. Ensure the workpiece is securely fixtured before beginning the tapping operation. Follow standard tap drill size recommendations for 8-32 UNC to achieve the correct thread engagement percentage. Do not reverse the tap under power without confirming the machine supports that function, as forcing a tap in a bind can result in breakage.