Osg 2885505 Spiral Point Tap 10-32 Unf Tin Hss

Product Description

The OSG 2885505 is a spiral point tap designed for cutting 10-32 UNF internal threads in a range of ferrous and non-ferrous materials. It features a 2-flute, plug chamfer geometry that pushes chips forward ahead of the cutting edge, making it well suited for through-hole tapping operations. Manufactured from high-speed steel (HSS) and finished with a titanium nitride (TiN) coating, the tap offers improved wear resistance and reduced friction compared to uncoated HSS. Thread limit is H3 with a 2B class of fit, delivering consistent tolerance control in production and maintenance applications.

This tap is appropriate for through-hole threading in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. It is commonly used in light manufacturing, maintenance and repair, and machine shop environments where 10-32 UNF fastener threads are required. The plug chamfer makes it the standard choice when tapping through-holes rather than blind holes. Right-hand thread direction matches standard fastener convention. It is sold individually and is suited for both manual and machine tapping setups.

Key Features

• Spiral point geometry pushes chips forward, keeping the flutes clear during through-hole tapping
• TiN coating improves surface hardness and reduces built-up edge in aluminum and steel
• H3 thread limit with 2B class of fit for consistent tolerance on 10-32 UNF threads
• High-speed steel construction provides toughness across a range of cutting speeds
• Plug chamfer for standard through-hole applications
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed for tapping 10-32 UNF through-holes in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel workpieces. Compatible with standard tap holders and tapping chucks sized for a 0.194-inch shank diameter.

Installation Notes

This tap is installed by machinists or maintenance technicians using a standard tap wrench, tap handle, or machine tapping chuck. Always ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill size for 10-32 UNF before tapping. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain thread quality. Do not reverse-drive the tap abruptly; back off periodically to break chips when working in deeper through-holes.