Irwin IR7402 Rethreading Hex Pipe Die 1/8 Npt Hcs

Product Description

The IRWIN IR7402 is a rethreading hex pipe die designed to restore damaged or corroded external pipe threads to NPT (National Pipe Taper) specification. Built from hardened carbon steel (HCS), this die delivers the cutting hardness needed to rethread steel, iron, and similar ferrous pipe materials. The 1/8-27 NPT thread profile matches the standard taper thread form used throughout plumbing and gas piping systems. Its hex outer profile seats securely in a standard pipe die stock, keeping the die stable during rethreading passes. Plumbers, pipefitters, and HVAC technicians reach for this die when field repairs require cleaning up or restoring threads on existing pipe rather than cutting new pipe.

This die is suited for rethreading 1/8 inch nominal pipe in residential and light commercial applications. Common use cases include restoring threads on gas supply stubs, water service nipples, and instrument connection ports where thread damage has occurred during service or removal. The compact 1/8-27 NPT size is common in low-pressure gas fittings, compressed air lines, and potable water piping where small-diameter connections are standard. A licensed plumber, pipefitter, or qualified HVAC technician would typically perform this work in compliance with applicable mechanical and plumbing codes.

Key Features

• 1/8-27 NPT thread profile matches standard pipe taper thread specification
• Hardened carbon steel (HCS) construction for durability on ferrous pipe materials
• Hex outer body seats securely in standard pipe die stocks
• Designed for rethreading applications to restore damaged or worn external threads
• Sold individually — one die per unit

Compatibility

Designed as an OEM-style rethreading die for use with standard hex pipe die stocks that accept 1/8 inch NPT dies. No specific compatible model numbers were provided in the product data.

Installation Notes

Isolate and depressurize any pipe or system before beginning rethreading work. A licensed plumber or pipefitter should perform rethreading on gas or pressurized water lines in accordance with local mechanical and plumbing codes. Apply cutting oil to the die and pipe threads before each pass to reduce heat buildup and extend die life. Inspect the restored threads with a calibrated NPT thread gauge before reassembling fittings to verify thread form and taper.

Technical Specifications

• Thread Standard: NPT (National Pipe Taper)
• Thread Size: 1/8-27
• Nominal Pipe Size: 1/8 inch
• Die Type: Hex Rethreading Die
• Material: Hardened Carbon Steel (HCS)
• UPC: 042526074028
• Sold As: Each

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: IR7402