Osg 1771901 Spiral Point Tap 10-32 Unf 3 Flute Plug

Product Description

The OSG 1771901 is a spiral point plug tap designed for threading 10-32 UNF internal threads in demanding materials. Built from powdered metal and finished with a steam oxide coating, this tap handles hardened steel, stainless steel, high-nickel alloys, and titanium. The spiral point geometry pushes chips forward ahead of the cutting action, making it well suited for through-hole applications. With 3 flutes, an H4 thread limit, and a 2B class of fit, it delivers consistent, accurate threads across high-stress fastening applications. Overall length is 2.374 inches with a thread length of 0.948 inches.

This tap is intended for use in machine tapping operations where difficult-to-machine materials are common. The 10-32 UNF designation makes it a standard choice in aerospace, instrumentation, and precision mechanical assemblies where fine-thread engagement is required. Right-hand thread direction means it pairs with standard CNC or manual tapping setups. It is typically used by machinists and tool-and-die professionals in production or maintenance environments. The OSG 312NI series is engineered specifically for high-nickel alloys and similarly tough materials.

Key Features

• Spiral point geometry pushes chips forward, suited for through-hole tapping
• Powdered metal construction provides enhanced hardness and wear resistance in tough materials
• Steam oxide coating reduces friction and provides a degree of chip lubricity
• H4 thread limit and 2B class of fit for standard tolerance threading
• Right-hand cut, no coolant-through requirement
• Rated for hardened steel, stainless steel, high-nickel alloy, and titanium applications

Compatibility

Designed for through-hole tapping in hardened steel, stainless steel, high-nickel alloy, and titanium. Part of the OSG 312NI series. Produces 10-32 UNF, 2B class of fit threads with an H4 thread limit.

Installation Notes

Install and operate this tap using a rigid tapping holder or CNC tapping cycle sized for the shank diameter of 0.194 inches. Disengage machine power and secure the workpiece before tool changes. Use appropriate cutting fluid rated for the workpiece material, particularly when tapping stainless steel or high-nickel alloys. Follow shop-specific feeds and speeds for powdered metal taps to avoid tool breakage.