{"product_id":"gibraltar-31051g-steel-thumb-screw-1-2-13-lobed-head","title":"Gibraltar 31051G Steel Thumb Screw 1\/2-13 Lobed Head","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe GIBRALTAR 31051G is a 12L14 steel thumb screw with a lobed aluminum head and a dog point tip, designed for manual fastening applications where tools are not required for routine adjustment or clamping. The fastener features a 1\/2-13 UNC thread and an overall length of 4.5 inches. The lobed head provides a secure grip surface for hand-tightening, while the dog point tip aids in alignment during installation. A black oxide finish provides a basic level of corrosion resistance and a uniform dark appearance. This type of fastener is commonly installed by machinists, millwrights, and maintenance technicians working on fixtures, jigs, and mechanical assemblies.\u003c\/p\u003e\u003cp\u003eThis thumb screw is suited for use in industrial, manufacturing, and maintenance environments where frequent manual adjustments are required. The shoulder construction adds lateral stability in applications where the fastener must resist side loading. The 1\/2-13 UNC thread size makes it compatible with standard inch-series tapped holes used widely across machine fixtures and tooling setups. Sold individually, this fastener fits applications requiring a single replacement or low-volume procurement.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e12L14 steel body with black oxide finish for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eLobed aluminum head — 2.5 inches diameter, 1.5 inches height — for hand-tightening without tools\u003c\/li\u003e\n\u003cli\u003eDog point tip, 0.3438 inches (11\/32 inches) diameter and 0.25 inches long, for alignment during engagement\u003c\/li\u003e\n\u003cli\u003eWith-shoulder construction for lateral load resistance\u003c\/li\u003e\n\u003cli\u003e1\/2-13 UNC thread standard, 4.5 inches overall length\u003c\/li\u003e\n\u003cli\u003eMeets TCMAI standards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard inch-series replacement thumb screw for machine fixtures, jigs, and tooling assemblies using 1\/2-13 UNC tapped holes.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by hand or with minimal tooling into a pre-tapped 1\/2-13 UNC hole. Verify the tapped hole depth and thread condition before installation to avoid cross-threading or bottoming out. Do not use power tools to drive this fastener, as the lobed head is intended for hand operation only. Ensure the mating assembly is de-energized or depressurized as required by the specific machine or fixture before adjusting or replacing this fastener.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: 12L14 Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Material\u003c\/strong\u003e: Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/2-13\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Type\u003c\/strong\u003e: Lobed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShoulder Type\u003c\/strong\u003e: With Shoulder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Type\u003c\/strong\u003e: Dog Point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 2.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 1.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Diameter\u003c\/strong\u003e: 0.3438 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Length\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: TCMAI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.31 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 31051G\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GIBRALTAR","offers":[{"title":"Default Title","offer_id":51696887103794,"sku":"31051G","price":41.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/21922698e12d7975085571134faabd11.jpg?v=1788347295","url":"https:\/\/voomisupply.com\/products\/gibraltar-31051g-steel-thumb-screw-1-2-13-lobed-head","provider":"Voomi Supply","version":"1.0","type":"link"}