Osg 1205600 Spiral Point Tap 2-56 Unc Plug Hss

Product Description

The OSG 1205600 is a spiral point tap designed for cutting 2-56 UNC internal threads in through-hole applications. It features a plug chamfer, 2-flute geometry, and a right-hand thread direction. Built from high-speed steel with a bright finish, this tap is suited for production threading in light-duty machine work. The spiral point design pushes chips forward ahead of the tap, reducing clogging in through-hole operations. 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. Thread limit is H2, and class of fit is 2B, making it appropriate for standard tolerance threading.

This tap is intended for threading 2-56 UNC holes in through-hole setups across a range of materials. Rated material applications include aluminum, cast aluminum, cast iron, hardened steel, high-carbon steel, low-carbon steel, and medium-carbon steel. It belongs to OSG Series 105 and is appropriate for use in CNC machining centers, drill presses, or hand tapping setups where precise small-diameter thread cutting is required. Machinists, tool and die makers, and precision fabricators working on small fastener applications will find this tap suited for their workflow.

Key Features

• Spiral point geometry pushes chips forward, ideal for through-hole tapping
• 2-56 UNC thread form with H2 thread limit for standard 2B class of fit
• High-speed steel construction for durability across a wide range of workpiece materials
• Bright finish with no coating for straightforward inspection and general-purpose use
• Plug chamfer provides a gradual lead-in, suitable for starting threads from the top of a hole
• Compact size at 1.75 inches overall length for use in tight or small-part setups

Compatibility

Designed as a standard spiral point plug tap for through-hole 2-56 UNC threading operations in compatible tapping chucks, tap holders, and floating tap collets sized for a 0.141-inch shank diameter.

Installation Notes

This tap should be installed by a machinist or tooling technician in a properly aligned tap holder or tapping chuck. Ensure the workpiece is securely fixtured and the spindle is set to the correct RPM and feed rate for the material being threaded. Apply appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Inspect the tap for wear or damage before each use, as small-diameter taps are susceptible to breakage under misalignment or excessive torque.