Osg 1725208 Spiral Point Tap 7/8-9 Unc Ticn Hss

Product Description

The OSG 1725208 is a spiral point plug tap designed for threading 7/8-9 UNC holes in a wide range of steel alloys. Built from Vanadium High Speed Steel (HSS-E) and coated with TiCN, it delivers extended tool life in demanding production and maintenance environments. The spiral point geometry pushes chips forward ahead of the cutting action, making this tap well suited for through-hole applications. With 3 flutes, an H4 thread limit, and a 3B class of fit, the 1725208 produces accurate, cleanly toleranced threads. Overall length is 4.689 inches with a thread length of 2-7/32 inches and a shank diameter of 0.697 inches.

This tap is intended for threading operations in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. It is a right-hand cut tool used in standard CNC machining centers, drill presses, and manual tapping operations where through-hole thread production is required. The plug chamfer provides a gradual lead-in, distributing cutting load across several threads. It is suited to both production shop and maintenance applications where 7/8-9 UNC threads are required in steel workpieces. Coolant-through is not supported on this configuration.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole threading
• TiCN coating increases surface hardness and reduces friction for longer tool life in steel
• Vanadium HSS-E construction provides toughness in interrupted cuts and hard materials
• H4 thread limit and 3B class of fit ensure accurate, tight-tolerance threads
• Plug chamfer distributes cutting load gradually for stable thread entry
• Right-hand cut, no coolant-through requirement simplifies tooling setup

Compatibility

Designed for threading 7/8-9 UNC through-holes in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel on standard tapping and CNC machining equipment.

Installation Notes

Installation of this tap is performed by qualified machinists following standard tapping procedures. Ensure the workpiece is securely fixtured and the spindle is aligned with the hole axis before engaging the tap. Use an appropriate cutting fluid for the material being threaded to reduce heat buildup and tool wear. Inspect the tap for chipping or wear regularly, especially when threading hardened or stainless steel grades.