{"product_id":"vlier-prt250-non-locking-knob-handle-plunger-1-4-20","title":"Vlier PRT250 Non-locking Knob Handle Plunger 1\/4-20","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VLIER PRT250 is a non-locking knob handle spring plunger with a 1\/4-20 thread and a Delrin knob, designed for indexing, positioning, and light-duty locating applications in mechanical assemblies. The plunger operates on spring tension with an initial end force of 0.12 pounds and a final end force of 0.36 pounds, making it suitable for applications requiring repeatable, low-force engagement. The maximum plunger diameter is 0.16 inches, and the body length is 0.63 inches. This part is typically installed by mechanical assemblers, tool-and-die technicians, or maintenance professionals working with jigs, fixtures, or light industrial equipment.\u003c\/p\u003e\n\u003cp\u003eThe PRT250 is suited for use in fixtures, jigs, tooling plates, and machine assemblies where a non-locking, hand-adjustable spring plunger is required. The Delrin knob allows for tool-free manual actuation, making it practical in applications where frequent repositioning or adjustment is expected. It threads into standard 1\/4-20 tapped holes and fits in both light industrial and precision mechanical contexts.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNon-locking plunger type  -  allows free spring return without manual disengagement\u003c\/li\u003e\n  \u003cli\u003eDelrin knob for tool-free manual actuation and comfortable hand operation\u003c\/li\u003e\n  \u003cli\u003e1\/4-20 thread for installation into standard tapped holes\u003c\/li\u003e\n  \u003cli\u003eInitial end force of 0.12 pounds, final end force of 0.36 pounds for light-duty positioning\u003c\/li\u003e\n  \u003cli\u003eCompact 0.63-inch body length fits tight assemblies and shallow mounting locations\u003c\/li\u003e\n  \u003cli\u003ePlunger projection of 0.13 inches with a maximum plunger diameter of 0.16 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-fit spring plunger for mechanical assemblies using standard 1\/4-20 tapped mounting holes requiring a non-locking, knob-actuated plunger.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires a standard 1\/4-20 tapped hole of sufficient depth to accept the body length. Thread the plunger in by hand using the Delrin knob, then tighten to the desired seating depth using an appropriate wrench on the hex if needed. Ensure the mounting surface is clean and free of debris before installation. Do not overtighten, as this may damage the Delrin knob or distort the spring mechanism.\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: Non-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\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\u003ePlunger Projection\u003c\/strong\u003e: 0.13 inches\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 Length\u003c\/strong\u003e: 0.97 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: No\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: PRT250\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":51971170107698,"sku":"PRT250","price":22.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d5195aa588c122d54849cf328354ac2a.jpg?v=1789954082","url":"https:\/\/voomisupply.com\/products\/vlier-prt250-non-locking-knob-handle-plunger-1-4-20","provider":"Voomi Supply","version":"1.0","type":"link"}