Ridgid 37840 Pipe Die 1-1/4 in Npt Right Hand 4 Piece

Product Description

The RIDGID 37840 is a 4-piece alloy steel pipe die set designed to cut 1-1/4-11-1/2 NPT right-hand threads on 1-1/4 inch conduit and pipe. Built for use with manual ratchet and 3-way pipe threaders, these dies deliver consistent, code-compliant NPT threads in the field or shop. The alloy steel construction provides the hardness needed to hold a clean cutting edge through repeated use on steel, black iron, and galvanized pipe. Plumbers, pipefitters, and HVAC mechanics working with threaded pipe assemblies rely on this die set for accurate thread form and reliable fit-up with NPT fittings.

This die set is intended for manual pipe threading operations on 1-1/4 inch pipe and conduit. It fits RIDGID OO-R, 11-R, 12-R, and O-R ratchet threaders as well as RIDGID 30A and 31A 3-way pipe threaders. The set is suited for residential and commercial plumbing, mechanical, and conduit work where NPT-threaded connections are required. The 4-piece configuration allows complete thread engagement around the pipe circumference for a clean, tapered NPT profile.

Key Features

• Cuts 1-1/4-11-1/2 NPT right-hand taper threads on 1-1/4 inch pipe and conduit
• 4-piece die set for full circumferential thread cutting
• Alloy steel construction for extended cutting life and edge retention
• Compatible with RIDGID OO-R, 11-R, 12-R, and O-R ratchet threaders
• Also fits RIDGID 30A and 31A 3-way pipe threaders

Compatibility

Designed for use with RIDGID OO-R, 11-R, 12-R, and O-R ratchet threaders and RIDGID 30A and 31A 3-way pipe threaders. Threads 1-1/4 inch conduit and pipe to the 1-1/4-11-1/2 NPT standard.

Installation Notes

Die installation and pipe threading should be performed by a licensed plumber, pipefitter, or qualified mechanical technician. Ensure the die set is properly seated and locked into the threader die head before beginning the threading operation. Apply cutting oil liberally during threading to reduce heat, extend die life, and produce a clean thread form. Inspect the finished thread for proper taper, depth, and engagement before assembling NPT fittings.

Technical Specifications

• Pipe Size: 1-1/4 inches
• Thread Standard: 1-1/4-11-1/2 NPT
• Thread Direction: Right Hand
• Number of Pieces: 4
• Material: Alloy Steel

Standard Information

• Brand: RIDGID
• Manufacturer Part Number: 37840