Product Overview

The NPT Spiral Flute Solid Carbide Pipe Tap is a premium threading tool designed for cutting National Pipe Taper (NPT) threads with high precision and efficiency. Manufactured from ultra-fine grain tungsten carbide, this tap offers superior hardness, wear resistance, and heat tolerance—making it ideal for mass production, abrasive materials, and tight-tolerance applications.

Engineered with spiral flutes, this tap is particularly effective for threading blind holes, where chip evacuation is critical. The spiral design helps remove chips upward, preventing clogging, reducing torque, and improving thread quality, especially in sticky or ductile materials such as aluminum, brass, and stainless steel.

Key Features

• Thread Type: NPT (National Pipe Taper), 60° angle, 1:16 taper

• Material: Solid tungsten carbide – ultra-durable and thermally stable

• Flute Geometry: Spiral flutes for effective chip evacuation in blind holes

• Precision Ground: Consistent thread depth and smooth surface finish

• Ideal for High-Pressure Applications: Delivers reliable, leak-proof pipe connections

Applications

• Cutting taper pipe threads in blind or semi-blind holes

• Used in hydraulic valves, pneumatic couplings, pipe fittings, and pressure vessels

• Suitable for aluminum alloys, cast iron, carbon steel, stainless steel, and non-ferrous metals

• Perfect for automated CNC machining, production tapping, and custom part manufacturing

Advantages

• Improved chip evacuation prevents tool breakage and enhances thread finish

• Stable cutting performance even at high speeds and feed rates

• Withstands abrasive wear in hard-to-machine materials

• Compatible with modern rigid tapping systems and high-precision CNC setups

• Creates tight, leak-resistant thread profiles for high-pressure pipe joints

Usage Recommendations

• Use appropriate pre-tap drill diameter for NPT thread specifications

• Apply coolant or tapping oil to maximize tool life and reduce friction

• Best suited for blind hole tapping and ductile materials

• For through-hole operations, consider switching to straight flute NPT taps