Irwin HANSON Pipe Tap, Taper Point, NPT, 1/4" - 18 TPI, 4-Flute: * Square-butt tap threads pipes quickly and easily * Convenient size stamps simplify tap selection * Durable high-carbon steel ensures long-lasting reliability * A full selection of taps are available in either National Pipe Taper (NPT) or British Standard Pipe (BSP) sizes * Tool Type: SAE Tap * Applicable Materials: Brass, Bronze, Copper, Iron, Plastic, Steel, Zinc * Pipe Capacity: 1/4" * Thread - TPI or Pitch: 18 TPI