{"product_id":"vlier-s57n-threaded-spring-plunger-5-16-18-steel-locking","title":"Vlier S57N Threaded Spring Plunger 5\/16-18 Steel Locking","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VLIER S57N is a threaded spring plunger designed for indexing, positioning, and light-duty locking applications in mechanical assemblies. It features a 5\/16-18 unified coarse thread with 1 inch of thread length and a standard-length steel body measuring 1 inch. The spring-loaded nose extends 3\/16 inch in projection, with a minimum plunger diameter of 0.133 inches and a maximum of 0.135 inches. An integrated locking element secures the plunger in the threaded bore after installation, preventing back-out under vibration. Initial end force is 1.5 pounds and final end force is 4.5 pounds, giving the plunger a defined resistance curve suited for repeatable positioning tasks.\u003c\/p\u003e\n\u003cp\u003eThis spring plunger installs into tapped holes in machine components, fixtures, jigs, tooling plates, and industrial equipment where a retractable, spring-loaded detent is needed. Typical applications include panel latching, slide positioning, and assembly-line fixture work in manufacturing and automation environments. A licensed machinist or mechanical technician typically handles installation in production tooling contexts, while field maintenance techs handle replacement in existing assemblies.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e5\/16-18 thread for direct installation into standard tapped holes\u003c\/li\u003e\n  \u003cli\u003e1 inch thread length and 1 inch body length for secure engagement depth\u003c\/li\u003e\n  \u003cli\u003e3\/16 inch plunger projection provides consistent detent travel\u003c\/li\u003e\n  \u003cli\u003e1.5 pound initial end force and 4.5 pound final end force for defined resistance\u003c\/li\u003e\n  \u003cli\u003eSteel nose and steel body for durability in industrial environments\u003c\/li\u003e\n  \u003cli\u003eIntegrated locking element prevents plunger back-out under vibration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation spring plunger for any assembly using a 5\/16-18 tapped hole requiring a standard-length threaded spring plunger with a locking element.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eA hex key or appropriate slotted driver is typically used to thread the plunger into a pre-tapped 5\/16-18 hole. Ensure the mating bore is clean and free of chips before installation. The locking element engages upon final tightening, so do not overtighten in a way that damages the thread or locking feature. De-energize or lock out any powered equipment before servicing assemblies containing this plunger.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/16-18\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Length\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Projection\u003c\/strong\u003e: 3\/16 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Plunger Diameter\u003c\/strong\u003e: 0.133 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Plunger Diameter\u003c\/strong\u003e: 0.135 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInitial End Force\u003c\/strong\u003e: 1.5 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinal End Force\u003c\/strong\u003e: 4.5 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNose Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLocking Element\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Length Type\u003c\/strong\u003e: Standard\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: VLIER\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: S57N\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":51975705264434,"sku":"S57N","price":15.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/66a4e7a93a680a485853722e191faaf0_33a91b43-6db9-4ef1-9217-021f5a4383dc.jpg?v=1789978236","url":"https:\/\/voomisupply.com\/products\/vlier-s57n-threaded-spring-plunger-5-16-18-steel-locking","provider":"Voomi Supply","version":"1.0","type":"link"}