Osg 7002600 Spiral Point Sti Tap 2-56 Unc Hss

Product Description

The OSG 7002600 is a spiral point STI tap designed for cutting 2-56 UNC threads in through-hole applications. STI taps cut oversized threads sized to accept Heli-Coil or equivalent wire thread inserts, restoring thread integrity in stripped or damaged bores. This tap features a plug chamfer for easy starting, 2 flutes for chip evacuation in open-cut conditions, and an H2 thread limit for close tolerance fits. Constructed from high-speed steel with a bright, uncoated finish, it handles general-purpose tapping across a wide range of ferrous and non-ferrous materials. Overall length is 1.75 inches with a thread length of 0.4375 inches.

This tap is suited for maintenance, repair, and production tapping operations where thread insert installation is required. Common applications include restoring 2-56 UNC threads in aluminum housings, sheet metal assemblies, and light machinery components. The plug chamfer style makes it appropriate for through-hole tapping where the tap can advance freely through the workpiece. It is typically used by machinists, tool-and-die professionals, and maintenance technicians working with small-diameter fastener threads.

Key Features

• STI thread profile cuts oversized bore for Heli-Coil and compatible wire thread inserts
• Plug chamfer provides smooth entry and progressive cutting action in through-holes
• H2 thread limit ensures close tolerance thread fit for reliable insert seating
• High-speed steel construction handles general-purpose tapping in ferrous and non-ferrous stock
• Bright, uncoated finish suitable for use with standard cutting fluids
• 2-flute design promotes chip flow in open through-hole cutting

Compatibility

Designed for tapping 2-56 UNC STI threads to accept wire thread inserts such as Heli-Coil or equivalent products in through-hole configurations. Fits standard tap wrenches and tapping heads accommodating the shank diameter of 0.141 inches.

Installation Notes

Secure the workpiece before tapping and use a properly sized drill to prepare the STI pilot hole per the insert manufacturer's drill chart. Apply appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Align the tap perpendicular to the work surface to avoid crooked or torn threads. This operation is typically performed by machinists or maintenance technicians following standard shop practices.