{"product_id":"vlier-s55an-threaded-spring-plunger-1-4-28-steel-locking","title":"Vlier S55AN Threaded Spring Plunger 1\/4-28 Steel Locking","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VLIER S55AN is a standard threaded spring plunger designed for indexing, positioning, and light-duty holding applications in industrial assemblies and fixtures. The plunger body and nose are both constructed from steel, providing durability under repeated cycling. It features a 1\/4-28 thread with a 1 inch thread length, a plunger projection of 3\/16 inches, and a plunger diameter range of 0.117 to 0.118 inches. A built-in locking element secures the plunger in place once installed, preventing back-out from vibration or torque. This component is installed by machinists, tool-and-die technicians, and mechanical assembly professionals working with precision fixtures, jigs, and machine tooling.\u003c\/p\u003e\u003cp\u003eThe S55AN is suited for use in threaded bores on fixture plates, machine bases, and assembly tooling where consistent spring-loaded positioning force is required. The 1\/4-28 fine thread provides positive engagement in both ferrous and non-ferrous threaded holes. With an initial end force of 1 pound and a final end force of 4 pounds, it is appropriate for light positioning and detent applications that require a predictable, repeatable actuation force across production runs.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/4-28 fine thread with 1 inch thread length for secure installation in standard threaded bores\u003c\/li\u003e\n\u003cli\u003eSteel body and steel nose for wear resistance and long service life\u003c\/li\u003e\n\u003cli\u003eLocking element prevents back-out under vibration or torque\u003c\/li\u003e\n\u003cli\u003ePlunger projection of 3\/16 inches suits standard indexing and detent applications\u003c\/li\u003e\n\u003cli\u003eInitial end force of 1 pound and final end force of 4 pounds provide consistent, predictable actuation\u003c\/li\u003e\n\u003cli\u003eStandard plunger length type allows straightforward replacement in existing fixturing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-fit replacement or new-installation threaded spring plunger for fixtures, jigs, and machine tooling that accept a 1\/4-28 threaded spring plunger with a standard plunger length configuration.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by machinists or mechanical assembly technicians using a hex key or spanner wrench appropriate for the plunger body style. Ensure the receiving threaded bore is clean and within tolerance before installation. The locking element is engaged during installation and should not be modified or removed. De-energize or lock out any powered equipment before servicing fixtures or tooling that contain spring plungers.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-28\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 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Plunger Diameter\u003c\/strong\u003e: 0.117 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Plunger Diameter\u003c\/strong\u003e: 0.118 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInitial End Force\u003c\/strong\u003e: 1 pound\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal End Force\u003c\/strong\u003e: 4 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\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: S55AN\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":51974289981746,"sku":"S55AN","price":17.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5c192985c037cc7d2a73693d60a6aba2.jpg?v=1789976780","url":"https:\/\/voomisupply.com\/products\/vlier-s55an-threaded-spring-plunger-1-4-28-steel-locking","provider":"Voomi Supply","version":"1.0","type":"link"}