{"product_id":"gibraltar-34038-locking-knob-handle-plunger-1-2-13","title":"Gibraltar 34038 Locking Knob Handle Plunger 1\/2-13","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe GIBRALTAR 34038 is a locking-style knob handle plunger designed for use in positioning, clamping, and indexing applications on industrial machinery, fixtures, and tooling setups. This threaded stud plunger features a 1\/2-13 thread size with a 7\/8-inch thread length and delivers an initial end force of 1.25 pounds ramping to a final end force of 5 pounds. The plunger diameter measures 0.249 inches with a tolerance of plus 0.001 inches, and the plunger projection extends 0.25 inches. Constructed from steel with a zinc-plated finish, the 34038 provides corrosion resistance for demanding shop and production environments. It ships as a knobless threaded stud, making it compatible with customer-supplied or separately sourced knobs.\u003c\/p\u003e\n\u003cp\u003eThe GIBRALTAR 34038 is suited for light- to medium-duty machine tool, fixture, and jig applications where a repeatable locking plunger action is required. The threaded stud configuration allows direct installation into tapped holes in steel, aluminum, or cast components. With a stud thread size of 3\/8-16 and a length under head\/shoulder of 1.125 inches, this plunger integrates into standard tooling plate and fixture designs. It is commonly installed by machine builders, maintenance machinists, and tooling technicians in production and job-shop environments.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLocking plunger element holds position under load without backing out\u003c\/li\u003e\n  \u003cli\u003e1\/2-13 main thread with 7\/8-inch thread length for secure engagement\u003c\/li\u003e\n  \u003cli\u003e3\/8-16 stud thread size for direct installation into tapped fixture components\u003c\/li\u003e\n  \u003cli\u003eInitial end force of 1.25 pounds rising to 5 pounds final end force\u003c\/li\u003e\n  \u003cli\u003eSteel construction with zinc-plated finish for corrosion resistance\u003c\/li\u003e\n  \u003cli\u003eKnobless threaded stud design accepts separately sourced or customer-supplied knobs\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 fixtures, tooling plates, and machine tool assemblies requiring a 1\/2-13 locking plunger with a 3\/8-16 stud thread.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or tooling technicians using standard hand tools. Ensure the receiving tapped hole is clean and matches the 3\/8-16 stud thread specification before installation. De-energize or lock out any associated machinery per OSHA lockout\/tagout procedures prior to installing or replacing plunger hardware. Do not exceed the rated final end force of 5 pounds, as over-compression may damage the locking element.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/2-13\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 0.875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStud Thread Size\u003c\/strong\u003e: 3\/8-16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInitial End Force\u003c\/strong\u003e: 1.25 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinal End Force\u003c\/strong\u003e: 5 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Plunger Diameter\u003c\/strong\u003e: 0.249 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Diameter Tolerance\u003c\/strong\u003e: plus 0.001 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Projection\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlunger Length\u003c\/strong\u003e: 1.937 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\/Shoulder\u003c\/strong\u003e: 1.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 0.4375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKnob Style\u003c\/strong\u003e: Threaded Stud without Knob\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-Plated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.06 pounds\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: GIBRALTAR\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 34038\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GIBRALTAR","offers":[{"title":"Default Title","offer_id":51696847257906,"sku":"34038","price":35.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3f9c6f6410666f13b80efc47f22696dc.jpg?v=1788346977","url":"https:\/\/voomisupply.com\/products\/gibraltar-34038-locking-knob-handle-plunger-1-2-13","provider":"Voomi Supply","version":"1.0","type":"link"}