{"product_id":"vlier-smprtl12p-locking-knob-handle-plunger-m12x1-75","title":"Vlier SMPRTL12P Locking Knob Handle Plunger M12x1.75","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VLIER SMPRTL12P is a locking knob handle plunger designed for precision indexing, positioning, and holding applications in industrial and mechanical assemblies. Built from stainless steel with a Delrin knob, this spring-loaded plunger features an M12x1.75 thread and a 25mm thread length, making it suitable for threaded housings and fixtures requiring reliable, repeatable engagement. The locking plunger mechanism delivers an initial end force of 0.56 pounds and a final end force of 1.8 pounds, allowing controlled resistance during indexing operations. The overall body length is 1.2 inches, and the maximum plunger diameter is 0.314 inches. Machinists, toolmakers, and mechanical assembly technicians install this type of component in jigs, fixtures, and positioning equipment.\u003c\/p\u003e\u003cp\u003eThe SMPRTL12P is used in industrial machinery, tooling fixtures, and mechanical positioning systems where a locking spring plunger is required to hold a component in place until deliberately released. The locking element prevents unintended plunger retraction under vibration or incidental contact. The Delrin knob provides a non-metallic grip surface for manual operation without tools. Applications include machine tool fixtures, assembly jigs, rotary tables, and any mechanical system that requires indexed positioning with a manual lock-release function.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLocking plunger mechanism with a positive locking element to prevent unintended retraction\u003c\/li\u003e\n\u003cli\u003eM12x1.75 thread size with 25mm thread length for direct installation into threaded housings\u003c\/li\u003e\n\u003cli\u003eStainless steel body construction for corrosion resistance in demanding environments\u003c\/li\u003e\n\u003cli\u003eDelrin knob provides a manual, tool-free locking and release interface\u003c\/li\u003e\n\u003cli\u003eInitial end force of 0.56 pounds and final end force of 1.8 pounds for controlled indexing engagement\u003c\/li\u003e\n\u003cli\u003ePlunger projection of 0.236 inches with a maximum plunger diameter of 0.314 inches\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard metric locking knob handle plunger for threaded housings using M12x1.75 thread, suitable for industrial jigs, fixtures, and mechanical positioning assemblies that accept this thread size and body format.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by threading the body directly into a pre-tapped M12x1.75 hole using the 0.472-inch hex on the body for torque application. Ensure the mating housing material and thread depth are compatible with the 25mm thread length before installation. Disengage any adjacent mechanical loads before servicing or replacing the plunger. Follow applicable machinery safety standards and lock out equipment power before performing installation or maintenance on live assemblies.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: M12x1.75\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 25mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Length\u003c\/strong\u003e: 1.2 inches (30.48mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Under Head\/Shoulder\u003c\/strong\u003e: 0.98 inches (24.89mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.98 inches (24.89mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead and Shoulder Height\u003c\/strong\u003e: 0.87 inches (22.10mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHex Size\u003c\/strong\u003e: 0.472 inches (11.99mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Plunger Diameter\u003c\/strong\u003e: 0.314 inches (7.98mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlunger Projection\u003c\/strong\u003e: 0.236 inches (5.99mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlunger Length\u003c\/strong\u003e: 1.85 inches (46.99mm)\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\u003eInitial End Force\u003c\/strong\u003e: 0.56 pounds (2.5N)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal End Force\u003c\/strong\u003e: 1.8 pounds (8N)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnob Style\u003c\/strong\u003e: Delrin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Stainless Steel\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: SMPRTL12P\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":51997780771122,"sku":"SMPRTL12P","price":78.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/92babc60882fe14aea7a1322b6a9e3e6_2c8f3d42-c28c-420d-ad39-72eabe182cea.jpg?v=1789994364","url":"https:\/\/voomisupply.com\/products\/vlier-smprtl12p-locking-knob-handle-plunger-m12x1-75","provider":"Voomi Supply","version":"1.0","type":"link"}