{"product_id":"vlier-pr250p-locking-pull-ring-spring-plunger-1-4-20-steel","title":"Vlier PR250P Locking Pull Ring Spring Plunger 1\/4-20 Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VLIER PR250P is a locking pull ring spring plunger designed for precision indexing and positioning applications in industrial assemblies. The plunger features a 1\/4-20 thread and a 0.155 inch plunger diameter with a 0.25 inch projection, delivering an initial end force of 1 pound and a final end force of 2.5 pounds. A pull ring locking element holds the plunger in the retracted position, preventing unintended engagement during setup or repositioning. The all-steel construction provides durability in demanding shop and machine environments. Maintenance technicians, machine builders, and tooling professionals typically install and service this style of component.\u003c\/p\u003e\n\u003cp\u003eThe PR250P is suited for use in jigs, fixtures, machine tools, and assembly tooling where controlled spring-loaded positioning is required. The locking pull ring design is particularly useful in applications where the plunger must remain retracted while a workpiece or component is loaded. The 1\/4-20 thread allows installation into standard tapped holes found across a wide range of industrial equipment and tooling setups.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLocking pull ring holds plunger retracted for hands-free workpiece loading\u003c\/li\u003e\n  \u003cli\u003e1\/4-20 thread size fits standard tapped holes in tooling and fixtures\u003c\/li\u003e\n  \u003cli\u003eInitial end force of 1 pound graduating to 2.5 pounds final end force\u003c\/li\u003e\n  \u003cli\u003e0.155 inch plunger diameter with 0.25 inch projection\u003c\/li\u003e\n  \u003cli\u003eAll-steel construction for durability in industrial environments\u003c\/li\u003e\n  \u003cli\u003eCompact body length of 1.14 inches suits space-constrained assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-install locking spring plunger for industrial jigs, fixtures, and machine tooling applications requiring a 1\/4-20 threaded spring plunger with a locking pull ring.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires a properly tapped 1\/4-20 hole in the receiving body. Thread the plunger in by hand first, then use appropriate tooling on the head to achieve the desired seating depth. Power down and de-energize any associated equipment before servicing components in an active assembly. Do not overtighten, as this can deform the thread or alter spring force performance.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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: 0.8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 0.8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Length\u003c\/strong\u003e: 1.14 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Length\u003c\/strong\u003e: 1.14 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Diameter\u003c\/strong\u003e: 0.155 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Projection\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 0.34 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRing Diameter\u003c\/strong\u003e: 0.62 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: 2.5 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Type\u003c\/strong\u003e: Locking\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLocking Element\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\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: PR250P\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":52036666294578,"sku":"PR250P","price":28.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/572ac9b952c484b3f998ccf8d96a2895.jpg?v=1790024034","url":"https:\/\/voomisupply.com\/products\/vlier-pr250p-locking-pull-ring-spring-plunger-1-4-20-steel","provider":"Voomi Supply","version":"1.0","type":"link"}