{"product_id":"vlier-prtl250p-locking-knob-handle-plunger-1-4-20","title":"Vlier PRTL250P Locking Knob Handle Plunger 1\/4-20","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VLIER PRTL250P is a locking knob handle plunger designed for precision indexing, positioning, and clamping applications in industrial and mechanical assemblies. It features a 1\/4-20 thread and a Delrin knob, offering a secure, hand-operable interface for repeated engagement and release cycles. The locking element holds the plunger retracted until the operator releases it, reducing unintended extension during machine setup or fixture adjustment. With an initial end force of 0.12 pounds and a final end force of 0.36 pounds, this plunger delivers controlled, repeatable spring pressure suited to light-duty locating tasks. Installation is handled by maintenance technicians and machine builders working in fabrication and fixture environments.\u003c\/p\u003e\n\u003cp\u003eThis plunger is suited for use in jigs, fixtures, machine tools, and production equipment where a hand-retractable, locking-style plunger is required. The 1\/4-20 thread makes it compatible with standard tapped holes in aluminum, steel, and engineered plastic assemblies. The Delrin knob provides chemical and wear resistance in light industrial environments. It is appropriate for both OEM assembly integration and field replacement on existing tooling setups.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLocking plunger type holds the nose retracted until manually released\u003c\/li\u003e\n  \u003cli\u003eDelrin knob provides durable, hand-friendly operation with chemical resistance\u003c\/li\u003e\n  \u003cli\u003e1\/4-20 thread fits standard tapped holes in common fixture materials\u003c\/li\u003e\n  \u003cli\u003eInitial end force of 0.12 pounds and final end force of 0.36 pounds for controlled spring engagement\u003c\/li\u003e\n  \u003cli\u003eMaximum plunger diameter of 0.16 inches with a plunger projection of 0.13 inches\u003c\/li\u003e\n  \u003cli\u003eCompact body length of 0.63 inches suits space-constrained panel and fixture installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-fit component for industrial jigs, fixtures, and machine tool assemblies requiring a 1\/4-20 locking knob handle plunger.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by maintenance technicians or machine builders using standard hand tools. Thread the plunger into a prepared 1\/4-20 tapped hole and tighten to the head shoulder using the hex size of 1\/4 inch. Ensure the assembly or fixture is de-energized and stationary before installing or replacing plunger components. Do not exceed the rated end force range by substituting heavier springs or modifying the plunger body.\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\u003ePlunger Type\u003c\/strong\u003e: Locking\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob Style\u003c\/strong\u003e: Delrin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInitial End Force\u003c\/strong\u003e: 0.12 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinal End Force\u003c\/strong\u003e: 0.36 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Plunger Diameter\u003c\/strong\u003e: 0.16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Projection\u003c\/strong\u003e: 0.13 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Length\u003c\/strong\u003e: 0.97 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Length\u003c\/strong\u003e: 0.63 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\/Shoulder\u003c\/strong\u003e: 0.50 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.50 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead and Shoulder Height\u003c\/strong\u003e: 0.47 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHex Size\u003c\/strong\u003e: 1\/4 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLocking Element\u003c\/strong\u003e: Yes\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: PRTL250P\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":52087837884722,"sku":"PRTL250P","price":31.33,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/92babc60882fe14aea7a1322b6a9e3e6_ecb9880c-75b3-434a-8f78-439b3b4a8096.jpg?v=1790060565","url":"https:\/\/voomisupply.com\/products\/vlier-prtl250p-locking-knob-handle-plunger-1-4-20","provider":"Voomi Supply","version":"1.0","type":"link"}