Irwin IR1904ZR Npt Pipe Tap 3/8 Inches

Product Description

The IRWIN IR1904ZR is a 3/8-inch NPT pipe tap designed for cutting internal tapered pipe threads in metal pipe fittings, valve bodies, and threaded ports. NPT (National Pipe Taper) threads are the standard for pressure-tight pipe connections in plumbing, HVAC, and gas piping systems. This tap cuts the tapered thread profile required for proper sealing without relying solely on thread sealant. It is a hand or machine tap intended for use by licensed plumbers, pipefitters, HVAC technicians, and electricians working with threaded conduit or pipe assemblies.

The IR1904ZR is suited for field and shop use where a 3/8-inch NPT threaded port needs to be cut or re-chased in steel, iron, brass, or similar materials. Typical applications include tapping new ports in manifolds, repairing damaged threads in valve bodies, and preparing fittings for threaded pipe connections in residential and light commercial plumbing and HVAC systems. Sold individually as a single tap.

Key Features

• 3/8-inch NPT tapered thread profile for pressure-rated pipe connections
• Designed for cutting internal pipe threads in metal workpieces
• Compatible with standard tap wrenches and machine tap holders
• NPT taper ensures interference fit for leak-resistant threaded joints
• Single-unit packaging for individual replacement or stocking

Compatibility

Designed as an OEM-style replacement and standard tooling tap for use wherever 3/8-inch NPT internal pipe threads are required in plumbing, HVAC, or gas piping applications.

Installation Notes

NPT pipe taps are used by licensed plumbers, pipefitters, and HVAC technicians following applicable codes such as the IPC and IFGC. Always secure the workpiece firmly and use appropriate cutting fluid to extend tap life and produce clean threads. De-energize, depressurize, and drain any system before tapping into live pipe or fittings. Do not force the tap if resistance increases sharply, as this may indicate chip buildup or material hardness requiring a different tap geometry.

Technical Specifications

• Thread Type: NPT (National Pipe Taper)
• Tap Size: 3/8 inches
• Sold As: Each
• Minimum Order Quantity: 1

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: IR1904ZR