Osg 1205701 Spiral Point Tap 2-56 Unc Bottoming Hss

Product Description

The OSG 1205701 is a spiral point tap designed for right-hand, through-hole threading in a 2-56 UNC thread form. It features a bottoming chamfer, 2 flutes, and a 2B class of fit, making it suitable for tapping close-tolerance threads in shallow or restricted-depth holes. Manufactured from high speed steel (HSS) with a steam oxide coating, the tap offers improved lubricity and moderate corrosion resistance during cutting operations. With an overall length of 1.75 inches and a thread length of 0.44 inches, this tap is sized for small-diameter precision work commonly found in machining and assembly environments.

The OSG 1205701 is suited for threading low-carbon steel, medium-carbon steel, high-carbon steel, cast iron, and non-ferrous metals. The spiral point geometry pushes chips forward ahead of the cutting action, making it effective in through-hole applications where chip evacuation is critical. It carries an H2 thread limit designation, indicating a tight tolerance range appropriate for precision threaded assemblies in general manufacturing, instrumentation, and light mechanical fabrication.

Key Features

• Spiral point flute geometry drives chips forward for clean through-hole threading
• Bottoming chamfer allows threading closer to the bottom of a hole than standard or plug chamfer taps
• HSS construction provides toughness across a range of workpiece materials including carbon steels and non-ferrous metals
• Steam oxide coating improves lubricity and reduces galling during the tapping process
• H2 thread limit ensures close tolerance fit per 2B class of fit requirements
• Right-hand thread direction; no coolant-through feature required for typical light-duty applications

Compatibility

Designed for through-hole threading in 2-56 UNC tapped features in low-carbon steel, medium-carbon steel, high-carbon steel, cast iron, and non-ferrous metal workpieces.

Installation Notes

This tap should be installed and operated by machinists or tool and die professionals familiar with small-diameter tapping procedures. Always secure the workpiece and use a properly aligned tap holder or tapping head to prevent breakage of small-diameter taps. Apply an appropriate cutting fluid for the workpiece material before and during the tapping operation. Inspect the tap for wear or chipping before each use, as small-diameter HSS taps are susceptible to breakage under misalignment or excessive feed pressure.