Osg 1205008 Spiral Point Tap 0-80 Unf Ticn Hss

Product Description

The OSG 1205008 is a spiral point tap designed for threading 0-80 UNF internal threads in a wide range of metallic materials. Built from high-speed steel with a titanium carbonitride (TiCN) coating, this tap delivers improved wear resistance and reduced friction compared to uncoated HSS tooling. It features a plug chamfer for through-hole applications and a 2-flute spiral point geometry that pushes chips forward, ahead of the cutting zone, reducing clogging during tapping. The overall length is 1.625 inches with a thread length of 0.3125 inches (5/16 inches) and a shank diameter of 0.141 inches. The H2 thread limit provides consistent fit within the 2B class-of-fit tolerance standard. Machinists and tool-and-die tradespeople rely on this tap for precision small-diameter threading work.

This tap is suited for through-hole tapping operations in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. Its TiCN coating makes it particularly effective in harder ferrous materials where tool life matters. The right-hand thread direction is standard for conventional fastener applications. At a 0-80 UNF size, it is commonly used in instrument manufacturing, electronics assembly, optics, and other precision fabrication environments where fine-thread fasteners are required.

Key Features

• 0-80 UNF thread form with right-hand thread direction and 2B class of fit
• TiCN coating increases surface hardness and extends tool life versus bare HSS
• Spiral point geometry pushes chips ahead of the tap, reducing chip-related breakage in through-hole applications
• Plug chamfer suits general-purpose through-hole threading applications
• H2 thread limit for consistent 2B tolerance compliance
• No coolant-through requirement simplifies setup for bench and machine use

Compatibility

Designed for use in through-hole tapping operations requiring a 0-80 UNF thread in the material types listed by the manufacturer: aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel.

Installation Notes

This tap should be installed in a tap holder or tapping head appropriate for the 0.141-inch shank diameter. Always ensure the workpiece is securely fixtured and the spindle or driver is properly aligned to the pre-drilled pilot hole before engaging the tap. Reverse the tap periodically when hand-tapping brittle materials to break and clear chips. At a 0-80 size, these taps are highly susceptible to breakage from misalignment or excessive feed force — use a tapping fluid or cutting oil appropriate for the workpiece material.