{"product_id":"vlier-ssph57-threaded-spring-plunger-5-16-18-stainless-steel","title":"Vlier SSPH57 Threaded Spring Plunger 5\/16-18 Stainless Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VLIER SSPH57 is a threaded spring plunger designed to provide controlled, repeatable positioning force in mechanical assemblies. The body and nose are both constructed from stainless steel, offering corrosion resistance in demanding environments. It features a 5\/16-18 thread with a 1 inch thread length and a standard plunger projection of 3\/16 inch. Initial end force is 1.5 pounds, middle end force is 3.0 pounds, and final end force is 4.5 pounds, giving installers a predictable force curve across the full plunger stroke. This part is installed by machinists, toolmakers, and mechanical assemblers in precision fixturing and positioning applications.\u003c\/p\u003e\n\u003cp\u003eThe SSPH57 is suited for use in jigs, fixtures, tooling plates, and mechanical assemblies where a spring-loaded detent or positioning element is required. Its compact plunger diameter of 0.133 to 0.135 inches and standard body length of 1 inch make it appropriate for space-constrained installations. The stainless steel construction makes it a practical choice for environments exposed to moisture, cleaning agents, or light chemical contact. It carries no locking element, relying solely on spring force to maintain plunger position.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e5\/16-18 thread for straightforward installation into standard tapped holes\u003c\/li\u003e\n  \u003cli\u003e1 inch thread length and 1 inch body length in a compact, standard-length profile\u003c\/li\u003e\n  \u003cli\u003eStainless steel body and nose for corrosion resistance\u003c\/li\u003e\n  \u003cli\u003e3\/16 inch plunger projection with a defined force range: 1.5 lb initial, 3.0 lb middle, 4.5 lb final end force\u003c\/li\u003e\n  \u003cli\u003eNo locking element  -  spring-only retention for smooth, repeatable actuation\u003c\/li\u003e\n  \u003cli\u003eMinimum plunger diameter 0.133 inches, maximum 0.135 inches for consistent fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard threaded spring plunger for mechanical assemblies, jigs, and fixtures requiring a 5\/16-18 threaded detent or positioning element with a standard 1 inch body length.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by threading the SSPH57 into a properly tapped 5\/16-18 hole using a hex key sized for the 0.093 inch hex drive. Ensure the mating hole is clean and free of debris before threading the plunger in. Do not overtighten, as excessive torque can deform the body or restrict plunger movement. De-energize or immobilize any moving machine components before servicing spring plungers in active assemblies.\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\u003eMiddle End Force\u003c\/strong\u003e: 3.0 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\u003eHex Size\u003c\/strong\u003e: 0.093 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Material\u003c\/strong\u003e: Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNose Material\u003c\/strong\u003e: Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLocking Element\u003c\/strong\u003e: No\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: SSPH57\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":51999636160818,"sku":"SSPH57","price":21.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c8e9c3e4c98da633a16bf2b92d781b09.jpg?v=1789995764","url":"https:\/\/voomisupply.com\/products\/vlier-ssph57-threaded-spring-plunger-5-16-18-stainless-steel","provider":"Voomi Supply","version":"1.0","type":"link"}