{"product_id":"vlier-ph55n-threaded-spring-plunger-1-4-20-steel-locking","title":"Vlier PH55N Threaded Spring Plunger 1\/4-20 Steel Locking","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VLIER PH55N is a standard threaded spring plunger designed to provide controlled, repeatable positioning force in mechanical assemblies. It features a 1\/4-20 thread size with a 1 inch thread length and a steel body, making it suitable for use in fixtures, jigs, tooling, and other precision mechanical applications. The spring-loaded nose projects 3\/16 inches and delivers an initial end force of 1 pound, a middle end force of 2.5 pounds, and a final end force of 4 pounds. A built-in locking element prevents the plunger from backing out under vibration or repeated cycling, adding reliability in demanding environments. Installation is straightforward for machinists, toolmakers, and mechanical assemblers.\u003c\/p\u003e\u003cp\u003eThe PH55N is used in light-duty positioning, detenting, and indexing applications where a compact, threaded plunger is needed to hold a workpiece, panel, or moving component in place under moderate spring force. It is well suited for machine tool fixtures, assembly jigs, and OEM mechanical equipment where space is limited and consistent force repeatability is required. The steel body and nose construction make it appropriate for industrial shop environments where durability under repeated actuation is expected.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/4-20 thread size with 1 inch thread length for direct installation into tapped holes\u003c\/li\u003e\n\u003cli\u003eSteel body and steel nose material for durability in industrial applications\u003c\/li\u003e\n\u003cli\u003e3\/16 inch plunger projection provides positive detenting or positioning engagement\u003c\/li\u003e\n\u003cli\u003eInitial end force of 1 pound, final end force of 4 pounds for controlled spring resistance\u003c\/li\u003e\n\u003cli\u003eLocking element prevents plunger from loosening under vibration or repeated use\u003c\/li\u003e\n\u003cli\u003eStandard plunger length type allows straightforward replacement in existing assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct-install threaded spring plunger for mechanical fixtures, jigs, tooling, and indexing assemblies requiring a 1\/4-20 threaded plunger with a locking element.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall into a properly tapped 1\/4-20 through or blind hole using a hex key sized to the 0.079 inch hex drive. Ensure the receiving bore is clean and free of debris before threading in the plunger. Torque to the assembly requirement for the application without over-driving, as over-tightening can distort the locking element. Disengage any spring-loaded or moving components in the assembly before servicing or replacing the plunger.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-20\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: 0.117 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\u003eHex Size\u003c\/strong\u003e: 0.079 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\u003eMiddle End Force\u003c\/strong\u003e: 2.5 pounds\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: PH55N\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":52040739062066,"sku":"PH55N","price":17.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6ffe0e870bd4ef2be590539fc196a090_93d733c1-0d17-4a83-be8c-94af54a55d8b.jpg?v=1790027230","url":"https:\/\/voomisupply.com\/products\/vlier-ph55n-threaded-spring-plunger-1-4-20-steel-locking","provider":"Voomi Supply","version":"1.0","type":"link"}