{"product_id":"vlier-slf250p-locking-knob-handle-plunger-1-4-20","title":"Vlier SLF250P Locking Knob Handle Plunger 1\/4-20","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VLIER SLF250P is a locking knob handle plunger designed for precision indexing, positioning, and spring-loaded retention applications in industrial and mechanical assemblies. Built from steel with a zinc gold chromate finish, this plunger features a 1\/4-20 thread size with a 0.4 inch thread length and a knurled locking knob for secure, tool-free adjustment. It delivers an initial end force of 0.5 pounds and a final end force of 2 pounds, making it suitable for light-duty locking and locating tasks. The integrated locking element holds the plunger in the retracted position when needed, reducing interference during component loading and unloading. Licensed trades and machine builders working with jigs, fixtures, and assembly tooling rely on this style of plunger for repeatable, reliable positioning.\u003c\/p\u003e\n\u003cp\u003eThe SLF250P is suited for use in manufacturing fixtures, tool and die setups, and light mechanical assemblies where a compact, threaded spring plunger with a locking knob is required. The 1\/4-20 thread makes it compatible with standard tapped holes in steel, aluminum, and similar materials. The knurled knob allows hand adjustment without additional tools, which suits frequent repositioning in production environments. This plunger is a direct fit for applications requiring a small-profile locking plunger with controlled end force and a defined plunger projection.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLocking plunger design holds plunger in retracted position for unobstructed part loading\u003c\/li\u003e\n  \u003cli\u003eKnurled knob style for hand-tightening and tool-free adjustment\u003c\/li\u003e\n  \u003cli\u003e1\/4-20 thread with 0.4 inch thread length for installation in standard tapped holes\u003c\/li\u003e\n  \u003cli\u003eInitial end force of 0.5 pounds, final end force of 2 pounds for light-duty retention\u003c\/li\u003e\n  \u003cli\u003eSteel construction with zinc gold chromate finish for corrosion resistance\u003c\/li\u003e\n  \u003cli\u003eCompact head diameter of 0.5 inches and head height of 0.28 inches for tight clearance installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation locking knob handle plunger for industrial fixtures, jigs, and mechanical assemblies requiring a 1\/4-20 threaded spring plunger with a locking element.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by threading the SLF250P into a pre-tapped 1\/4-20 hole by hand or with a wrench applied to the knob body. Ensure the mating thread depth accommodates the 0.4 inch thread length before installation. Disengage any stored spring force before removing the plunger from an assembly. Follow applicable machinery safety lockout procedures before servicing fixtures or tooling that incorporate this plunger.\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: 0.4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInitial End Force\u003c\/strong\u003e: 0.5 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinal End Force\u003c\/strong\u003e: 2 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Plunger Diameter\u003c\/strong\u003e: 0.123 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Plunger Diameter\u003c\/strong\u003e: 0.124 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Projection\u003c\/strong\u003e: 0.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Length\u003c\/strong\u003e: 0.805 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\/Shoulder\u003c\/strong\u003e: 0.53 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 0.28 inches\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: Knurled\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  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Zinc Gold Chromate\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: SLF250P\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":51972440293682,"sku":"SLF250P","price":22.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0154d278ae7279f36743acd3e8dc8651.jpg?v=1789969025","url":"https:\/\/voomisupply.com\/products\/vlier-slf250p-locking-knob-handle-plunger-1-4-20","provider":"Voomi Supply","version":"1.0","type":"link"}