Osg 1292001 Plug Hand Tap 1/2-13 Unc 4 Flute Hss

Product Description

The OSG 1292001 is a 1/2-13 UNC plug chamfer hand tap designed for threading operations in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with an oxide finish, it delivers consistent thread quality in production and maintenance tapping applications. The plug chamfer features a moderate lead-in that suits through-holes and deep blind holes alike. With 4 right-hand flutes and an H3 thread limit, this tap holds tight tolerances on UNC threads, making it a reliable choice for machinists and maintenance technicians working in carbon steels and cast iron.

This tap is suited for hand tapping and machine tapping in materials including aluminum, cast aluminum, cast iron, low carbon steel, medium carbon steel, and high carbon steel. At 6 inches overall length with a 0.507-inch shank diameter, it fits standard tap wrenches and tapping heads used in general machining, fabrication shops, and industrial maintenance environments. The H3 thread limit is appropriate for standard tolerance UNC threads requiring a close fit with commercially available fasteners.

Key Features

• 1/2-13 UNC thread form with H3 thread limit for consistent tolerance control
• 4 right-hand flutes for efficient chip evacuation in through and blind holes
• Plug chamfer provides a balanced lead-in, suitable for most general tapping applications
• High-speed steel construction handles carbon steels, cast iron, aluminum, and cast aluminum
• Oxide finish improves lubrication retention and corrosion resistance during use
• 6-inch overall length accommodates extended-reach tapping setups

Compatibility

Designed for use in standard tap wrenches and tapping heads accepting a 0.507-inch shank diameter; compatible with through-hole and blind-hole tapping of 1/2-13 UNC threads in aluminum, cast aluminum, cast iron, and carbon steel workpieces.

Installation Notes

Hand taps should be installed by a qualified machinist or maintenance technician familiar with threading operations and proper tap alignment. Secure the workpiece firmly before tapping and use appropriate cutting fluid for the material being threaded to extend tap life and improve thread quality. Back the tap out periodically to clear chips, particularly in blind holes. Never force a tap against resistance — back off immediately if unusual torque is felt to avoid breakage.