Osg 1210601 Spiral Point Tap 2-56 Unc Plug Hss

Product Description

The OSG 1210601 is a spiral point tap designed for cutting 2-56 UNC internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a steam oxide finish, this plug chamfer tap pushes chips forward ahead of the cutting zone, reducing clogging in through-hole applications. It features 2 flutes, a right-hand thread direction, and an H3 thread limit for consistent tolerance control. Overall length is 1.75 inches with a thread length of 0.441 inches (7/16 inches) and a shank diameter of 0.141 inches. Installed by machinists and maintenance trades working on precision assemblies, small fastener applications, and light-duty threaded connections.

This tap is suited for through-hole tapping operations in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The spiral point geometry is most effective in through-hole work where chips can exit cleanly out the back of the hole. Typical applications include instrument panels, small enclosures, electronic assemblies, and precision mechanical components requiring 2-56 UNC fastener threads. The compact 2-56 thread size makes this a common choice in light manufacturing, repair, and prototype work.

Key Features

• Spiral point design pushes chips forward for clean through-hole tapping
• High-speed steel construction handles a broad range of metals including hardened steel
• Steam oxide coating improves lubricity and corrosion resistance
• H3 thread limit provides consistent fit for standard 2-56 UNC tolerance class
• Right-hand cut, plug chamfer for standard entry tapping
• No coolant-through requirement - suitable for conventional tapping setups

Compatibility

Designed for cutting 2-56 UNC threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. Suitable for through-hole tapping in any setup accommodating a 0.141-inch shank diameter.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench, tapping head, or CNC rigid tapping cycle. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill size for 2-56 UNC before starting. Apply appropriate cutting fluid for the material being tapped to extend tool life and improve thread quality. Do not reverse the tap without breaking chips first in materials prone to chip packing.