{"product_id":"vlier-prtl375-locking-knob-handle-plunger-3-8-16","title":"Vlier PRTL375 Locking Knob Handle Plunger 3\/8-16","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VLIER PRTL375 is a locking knob handle plunger designed for positioning, indexing, and retention applications in industrial and mechanical assemblies. It features a 3\/8-16 thread size and a maximum plunger diameter of 0.25 inches, with a Delrin knob handle that allows the operator to retract and lock the plunger in the retracted position for hands-free access. Initial end force is 0.25 pounds and final end force is 2 pounds, providing a controlled spring-loaded engagement range suited to light-duty locating and holding tasks. The body length is 0.94 inches with a thread length of 0.75 inches under the head and shoulder.\u003c\/p\u003e\n\u003cp\u003eThis plunger is used in jigs, fixtures, machine guarding, tooling plates, and similar assemblies where a retractable, lockable locating pin is required. The locking knob style allows technicians and assemblers to hold the plunger in the retracted position during workpiece loading or repositioning, then release it for positive engagement. It is installed by machinists, tool and die technicians, and maintenance mechanics working with production fixtures or custom fabrication assemblies. The black finish provides basic corrosion resistance for typical shop environments.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLocking plunger type holds retracted position for hands-free workpiece handling\u003c\/li\u003e\n  \u003cli\u003eDelrin knob handle for comfortable manual operation without tooling\u003c\/li\u003e\n  \u003cli\u003e3\/8-16 thread size for straightforward installation into standard tapped holes\u003c\/li\u003e\n  \u003cli\u003eEnd force range of 0.25 pounds initial to 2 pounds final for light-duty indexing\u003c\/li\u003e\n  \u003cli\u003eSteel construction with black finish for durability in shop environments\u003c\/li\u003e\n  \u003cli\u003eCompact body length of 0.94 inches suits space-constrained assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-fit locking knob handle plunger for assemblies using a 3\/8-16 threaded mounting hole, typical of industrial jigs, fixtures, and tooling plate applications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by threading the PRTL375 into a pre-tapped 3\/8-16 hole using the hex feature for wrench engagement. Ensure the mating thread bore is clean and free of debris before installation. De-energize or lock out any powered equipment before servicing assemblies that incorporate this plunger. Do not exceed the rated end force range by modifying the spring or plunger mechanism.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 3\/8-16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Type\u003c\/strong\u003e: Locking\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInitial End Force\u003c\/strong\u003e: 0.25 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\u003eMaximum Plunger Diameter\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Projection\u003c\/strong\u003e: 0.18 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Length\u003c\/strong\u003e: 1.4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Length\u003c\/strong\u003e: 0.94 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\/Shoulder\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead and Shoulder Height\u003c\/strong\u003e: 0.65 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHex Size\u003c\/strong\u003e: 3\/8 inches\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: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black\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: PRTL375\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":52003519725874,"sku":"PRTL375","price":32.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/bdabea6fada38c2b259bff2b23d76058.jpg?v=1789998836","url":"https:\/\/voomisupply.com\/products\/vlier-prtl375-locking-knob-handle-plunger-3-8-16","provider":"Voomi Supply","version":"1.0","type":"link"}