Osg 2832401 Spiral Point Tap 1/2-13 Unc 3 Flute Plug

Product Description

The OSG 2832401 is a spiral point tap designed for cutting 1/2-13 UNC internal threads in through-hole applications. Also known as a gun tap, the spiral point geometry pushes chips forward ahead of the cutting zone, reducing clogging and allowing continuous chip evacuation in production environments. This tap is manufactured from vanadium high speed steel (HSS-E) and finished with a steam oxide coating that improves lubricity and corrosion resistance. It features a plug chamfer, 3 flutes, an H3 thread limit, and a 3B class of fit. Licensed machinists, toolmakers, and maintenance mechanics typically select this tap for general-purpose tapping on a variety of ferrous and non-ferrous materials.

The OSG 2832401 is suited for tapping through holes in materials including aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, hardened steel, and cast iron. The plug chamfer provides gradual thread engagement, making it appropriate for both hand tapping and machine tapping on drill presses, CNC machining centers, and tapping machines. The right-hand thread direction and H3 tolerance make it a standard production choice for 1/2-13 UNC threaded fastener holes in both job shop and high-volume manufacturing settings.

Key Features

• Spiral point geometry pushes chips forward for efficient through-hole tapping
• Vanadium high speed steel (HSS-E) construction for extended tool life across a broad material range
• Steam oxide coating improves lubricity and reduces galling during cutting
• Plug chamfer for gradual thread engagement — compatible with hand and machine tapping
• H3 thread limit with 3B class of fit for consistent thread tolerance
• Coolant-through design not required — suitable for standard flood or manual lubrication

Compatibility

Designed as an OEM-style production tap for 1/2-13 UNC through-hole threading operations across the material applications listed in the specifications. Part of the OSG Series 280 tap line.

Installation Notes

Install in a tapping chuck, floating tap holder, or rigid holder rated for the tapping machine in use. Ensure the tap is properly aligned with the drilled hole before engagement to avoid cross-threading or tap breakage. Apply appropriate cutting fluid for the workpiece material before and during tapping. Inspect the tap for wear or chipping regularly, and replace before dimensional tolerance on thread form is compromised.