Osg 2884400 Spiral Point Tap 2-56 Unc 2 Flute Hss

Product Description

The OSG 2884400 is a spiral point tap designed for cutting right-hand internal threads to a 2-56 UNC specification in through-hole applications. With 2 flutes and a plug chamfer, this tap pushes chips ahead of the cut, keeping the flutes clear and reducing the risk of chip packing in production or maintenance drilling operations. The tap is manufactured from high-speed steel (HSS) with a bright finish and conforms to a 2B class of fit, which is the standard tolerance range for general-purpose threaded fastener assemblies. At 1.75 inches overall length with a 0.437-inch thread length, it fits standard tap handles and machine tap holders for #2-56 work.

This tap is suited for threading small-diameter through-holes in light manufacturing, instrument assembly, electronics enclosures, and general machining where 2-56 UNC fasteners are used. Rated material applications include aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. It is a practical choice for both manual tapping operations and low-speed machine tapping where through-hole thread cutting at a fine pitch is required.

Key Features

• 2-56 UNC thread form with 2B class of fit for standard general-purpose fastener tolerance
• Spiral point design pushes chips forward, suitable for through-hole tapping
• 2 flutes with plug chamfer for gradual thread engagement and reduced tap breakage risk
• High-speed steel construction provides good wear resistance in aluminum and low-to-medium carbon steel
• Bright finish, no coating — allows direct visual inspection of tool condition
• Right-hand thread direction, no coolant-through feature

Compatibility

Designed for threading 2-56 UNC through-holes in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel workpieces. Fits standard tap handles and machine holders sized for a 0.141-inch shank diameter.

Installation Notes

Spiral point taps are installed by machinists or maintenance technicians using a tap handle, tap wrench, or machine tap holder. Always secure the workpiece and ensure the tap is started perpendicular to the hole to avoid thread misalignment or tap breakage. Apply an appropriate cutting fluid for the workpiece material before and during tapping. At the 2-56 size, tap breakage risk is elevated — avoid excessive force and back the tap out periodically to clear chips even in through-hole work.