Midland Industries 30414 Welding Stem Nut Assembly Brass

Product Description

The MIDLAND INDUSTRIES 30414 is a right-hand thread welding stem and nut assembly designed for use on oxygen lines in welding hose applications. Constructed from brass, this fitting connects a 5/16-inch hose barb on one end to a 9/16-18 RH UNF threaded connection on the other. It is rated for a maximum operating pressure of 150 psi and handles temperatures from -40 to 160 degrees F. The compact brass construction makes it suitable for professional welding supply systems where a secure, leak-resistant hose-to-fitting connection is required. Licensed gas and welding technicians are the primary installers of this assembly.

This fitting is used in oxygen line welding hose assemblies, typically in industrial, shop, and field welding setups. The right-hand thread designation indicates compatibility with oxygen service connections, following the standard industry convention that distinguishes oxygen fittings from fuel gas fittings. It is appropriate for both light fabrication shops and larger industrial welding operations that require reliable hose barb-to-threaded connections at the regulator or torch end of the assembly.

Key Features

• 5/16-inch hose barb inlet for secure hose attachment without slippage
• 9/16-18 RH UNF threaded outlet for standard oxygen line connections
• Brass construction for corrosion resistance and compatibility with oxygen service
• Rated to 150 psi maximum operating pressure
• Wide temperature range: -40 to 160 degrees F
• Right-hand thread configuration identifies and confirms oxygen line service per welding industry standards

Compatibility

Designed as an OEM-style replacement or new-installation fitting for right-hand thread oxygen line welding hose assemblies using a 5/16-inch hose barb and 9/16-18 RH UNF threaded connection.

Installation Notes

Installation should be performed by a qualified welding technician or licensed gas fitter familiar with compressed gas system assembly. Always shut off the oxygen supply and bleed pressure from the hose before disassembling or installing any fitting. Do not use thread sealants or lubricants that are not rated for oxygen service, as contamination creates a fire and explosion hazard. Verify thread engagement and test for leaks with an approved oxygen-safe leak detection solution before returning the system to service.