{"product_id":"merit-brass-k619-04-pipe-locknut-1-4-in-316-ss-threaded","title":"Merit Brass K619-04 Pipe Locknut 1\/4 in 316 Ss Threaded","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe MERIT BRASS K619-04 is a 1\/4 inch pipe locknut machined from 316 stainless steel and designed for threaded piping assemblies. It uses a female national pipe straight locknut (FNPSL) end connection and carries a 150 psi pressure rating. At 15\/16 inches in length, this locknut is sized for compact inline and panel-mount applications. Licensed plumbers, pipefitters, and mechanical contractors use this hardware to secure fittings, bushings, and bulkhead connections against panels or manifolds. The 316 stainless steel construction provides elevated corrosion resistance compared to 304 grade, making it suitable for wet, chemical, or marine-adjacent environments.\u003c\/p\u003e\n\u003cp\u003eThis locknut is well suited for light commercial and industrial plumbing systems where a low-pressure threaded connection point must be mechanically locked in place. Typical applications include instrument panel feedthroughs, fluid distribution manifolds, and process piping assemblies operating within the 150 psi working pressure limit. The FNPSL thread form accommodates straight-threaded male adapters without taper engagement, relying on a sealing face or gasket at the mating surface rather than thread interference.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e316 stainless steel construction for superior corrosion resistance in wet and chemical service environments\u003c\/li\u003e\n  \u003cli\u003eFNPSL (female national pipe straight locknut) end connection for straight-thread panel-mount applications\u003c\/li\u003e\n  \u003cli\u003e150 psi pressure rating suitable for low-pressure fluid and instrumentation systems\u003c\/li\u003e\n  \u003cli\u003e15\/16 inch body length in a compact 1\/4 inch fitting size\u003c\/li\u003e\n  \u003cli\u003eThreaded connection type with ISO standard compliance\u003c\/li\u003e\n  \u003cli\u003eSold individually — no minimum order beyond single unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation locknut for threaded 1\/4 inch pipe fittings in low-pressure plumbing and instrumentation assemblies that require ISO-compliant straight-thread locknut hardware.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by licensed plumbers or pipefitters following applicable IPC and facility piping codes. Shut off system pressure and verify a zero-pressure condition before removing or installing any threaded fitting hardware. Use an appropriate pipe wrench or open-end wrench sized to the locknut flats — do not use pliers or tools that can deform the seating face. Thread engagement and sealing method should follow the fitting manufacturer's specification for FNPSL connections, as straight threads do not self-seal on the thread form.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitting Size\u003c\/strong\u003e: 1\/4 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitting Type\u003c\/strong\u003e: Locknut\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Connection\u003c\/strong\u003e: FNPSL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection Type\u003c\/strong\u003e: Threaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: 316 Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: 150 psi\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 15\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ISO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.04 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 40175300\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: MERIT BRASS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: K619-04\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MERIT BRASS","offers":[{"title":"Default Title","offer_id":51538755453234,"sku":"K619-04","price":21.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/343f24b4f19daff2abda4ce8af94bd7b.jpg?v=1785826121","url":"https:\/\/voomisupply.com\/products\/merit-brass-k619-04-pipe-locknut-1-4-in-316-ss-threaded","provider":"Voomi Supply","version":"1.0","type":"link"}