Irwin IR7404 Hex Pipe Rethreading Die 3/8-18 Npt

Product Description

The IRWIN IR7404 is a hex-style pipe rethreading die designed to cut and restore 3/8-18 NPT external threads on pipe and fittings. Made from high carbon steel (HCS), it delivers the hardness needed to thread or rethread steel and iron pipe in the field or shop. The hex body allows standard die stock or wrench engagement for controlled torque during threading. Plumbers, pipefitters, and mechanical contractors reach for this die when restoring damaged threads or cutting new NPT threads on cut-to-length pipe sections.

This die is suited for residential and light commercial plumbing, gas piping, and mechanical piping applications where 3/8-inch NPT connections are standard. It is commonly used during pipe repair, rough-in work, or maintenance service calls where a threading machine is not on site. The compact hex design makes it practical for tight spaces and field use without dedicated threading equipment.

Key Features

• 3/8-18 NPT thread form for standard tapered pipe thread cutting and rethreading
• Hex body profile accepts standard die stocks and adjustable wrenches for field use
• High carbon steel construction provides hardness and edge retention on steel and iron pipe
• Rethreading geometry suited for cleaning and restoring damaged or corroded pipe threads
• Sold individually, no additional dies required for single-size work

Compatibility

Designed for use with standard hex die stocks sized for 3/8-18 NPT hex dies. Cuts and rethreads tapered NPT external threads on steel and iron pipe in plumbing, gas, and mechanical piping applications.

Installation Notes

Licensed plumbers and pipefitters should follow IFGC and IPC requirements when threading pipe for gas or potable water service. Shut off and depressurize the line before rethreading any in-service pipe. Apply cutting oil generously during threading to extend die life and produce clean thread form. Inspect finished threads with a NPT thread gauge or mating fitting before pressurizing the system.

Technical Specifications

• Thread Standard: NPT (National Pipe Taper)
• Thread Size: 3/8-18
• Die Style: Hex
• Material: High Carbon Steel (HCS)
• Unit of Measure: Each

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: IR7404