{"product_id":"midland-industries-30431-lh-welding-stem-nut-brass-1-4-in-barb","title":"Midland Industries 30431 Lh Welding Stem Nut Brass 1\/4 in Barb","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe MIDLAND INDUSTRIES 30431 is a left-hand thread welding stem and nut assembly designed for acetylene and fuel-gas hose connections in welding and cutting applications. Constructed from brass, this fitting combines a 1\/4-inch hose barb on one end with a 9\/16-18 LH UNF threaded connection on the other. The left-hand thread configuration is a standard safety convention for fuel-gas lines, preventing accidental interchange with oxygen-side fittings. It carries a maximum operating pressure of 150 psi and is rated for service from -40 to 160 degrees F, making it suitable for typical shop and field welding environments. Plumbers, pipefitters, and welding equipment technicians are the primary installers.\u003c\/p\u003e\n\u003cp\u003eThis assembly is used on acetylene hose lines in oxy-fuel welding, cutting, and brazing setups. The 1\/4-inch hose barb end accepts standard fuel-gas welding hose, while the 9\/16-18 LH UNF threaded end connects to regulators, torches, or manifold fittings that use the left-hand thread standard. It is appropriate for both portable and fixed welding stations in residential shops, commercial fabrication facilities, and field service applications. The brass construction provides corrosion resistance and good sealing characteristics for low-to-medium pressure gas service.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLeft-hand thread (9\/16-18 LH UNF) meets fuel-gas safety convention, preventing mix-up with oxygen fittings\u003c\/li\u003e\n  \u003cli\u003e1\/4-inch hose barb end accepts standard acetylene welding hose\u003c\/li\u003e\n  \u003cli\u003eBrass construction offers corrosion resistance for gas service environments\u003c\/li\u003e\n  \u003cli\u003eRated to 150 psi maximum operating pressure\u003c\/li\u003e\n  \u003cli\u003eWide temperature range: -40 to 160 degrees F\u003c\/li\u003e\n  \u003cli\u003eCompact profile at approximately 1.35 inches in length\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or service fitting for acetylene-side welding hose assemblies using a 1\/4-inch hose barb inlet and 9\/16-18 LH UNF threaded outlet, consistent with standard fuel-gas line fittings.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified pipefitter, welding equipment technician, or similarly trained trade professional. Always close the cylinder valve and bleed all pressure from the hose before disassembling or replacing any fitting. Left-hand threads tighten counterclockwise  -  do not apply excessive force or use tools that could deform the brass threads. After assembly, leak-test all connections with an approved leak-detection solution before returning the system to service; never use an open flame to check for leaks.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection Size 1\u003c\/strong\u003e: 1\/4 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection Type 1\u003c\/strong\u003e: Hose Barb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection Size 2\u003c\/strong\u003e: 9\/16-18 LH UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection Type 2\u003c\/strong\u003e: Threaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: 9\/16-18 Left-Hand (LH)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Operating Pressure\u003c\/strong\u003e: 150 psi\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature Range\u003c\/strong\u003e: -40 to 160 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Brass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 1.35 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight\u003c\/strong\u003e: 0.45 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 0.55 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.02 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Left-Hand Thread for Acetylene Line \/ Welding Hose\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: MIDLAND INDUSTRIES\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 30431\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MIDLAND INDUSTRIES","offers":[{"title":"Default Title","offer_id":67951658828082,"sku":"30431","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/024b3e956d3c1784554a19545779aed1_2e385cdb-c385-49f6-adf2-703790a38243.jpg?v=1791732327","url":"https:\/\/voomisupply.com\/products\/midland-industries-30431-lh-welding-stem-nut-brass-1-4-in-barb","provider":"Voomi Supply","version":"1.0","type":"link"}