{"product_id":"gibraltar-831405-g-shoulder-screw-3-8-in-black-oxide-steel","title":"Gibraltar 831405-G Shoulder Screw 3\/8 in Black Oxide Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe GIBRALTAR 831405-G is a steel shoulder screw with a black oxide finish, designed for precision fastening applications that require a fixed bearing surface or pivot point. The shoulder measures 0.375 inches in diameter and 0.5 inches in length, providing a consistent cylindrical surface for bushings, bearings, or linkage components to ride against. The threaded portion is 5\/16-18 UNC, driven by a 3\/16-inch hex socket. Material grade 1137 steel gives this fastener good machinability and adequate strength for mechanical assemblies. Maintenance technicians and mechanical assemblers typically use shoulder screws in industrial equipment, fixtures, and machinery where controlled clearance fits are required.\u003c\/p\u003e\u003cp\u003eThis shoulder screw is suited for use in jigs, fixtures, conveyor systems, and general industrial machinery where a precision shoulder is needed to guide or retain a component. The black oxide finish provides mild corrosion resistance and reduces light reflection on the fastener surface. The hex socket drive allows installation in tight clearances where a standard wrench would not fit. It is sold individually with a minimum order quantity of 2 units.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eShoulder diameter of 0.375 inches provides a precise bearing surface for bushings and linkage components\u003c\/li\u003e\n\u003cli\u003e0.5-inch shoulder length suits shallow mounting applications and thin-plate assemblies\u003c\/li\u003e\n\u003cli\u003e5\/16-18 UNC thread engages standard tapped holes in steel and aluminum components\u003c\/li\u003e\n\u003cli\u003e3\/16-inch hex socket drive allows installation with a standard Allen wrench in confined spaces\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish on grade 1137 steel offers mild corrosion resistance and a low-glare surface\u003c\/li\u003e\n\u003cli\u003eHead diameter of 0.5625 inches and head height of 0.25 inches provide a low-profile clamping surface\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard shoulder screw for use in industrial fixtures, mechanical assemblies, and equipment requiring a 3\/8-inch shoulder diameter with 5\/16-18 UNC threading.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation requires a 3\/16-inch hex key or Allen driver. Ensure the mating tapped hole is clean and dimensionally correct for 5\/16-18 UNC threads before installation. Do not overtighten, as the shoulder — not the thread — is the functional bearing surface; excessive torque can deform the shoulder fit. Follow applicable machinery maintenance procedures and equipment manufacturer guidelines when replacing fasteners in load-bearing assemblies.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShoulder Diameter\u003c\/strong\u003e: 0.375 inches (3\/8 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShoulder Length\u003c\/strong\u003e: 0.5 inches (1\/2 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/16-18 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Type\u003c\/strong\u003e: Hex Socket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Size\u003c\/strong\u003e: 3\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.5625 inches (9\/16 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 0.25 inches (1\/4 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel, Grade 1137\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1 pound\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: 831405-G\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GIBRALTAR","offers":[{"title":"Default Title","offer_id":51715880157490,"sku":"831405-G","price":37.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2c4c992e75857846c43caab584b0ffd8.jpg?v=1788519347","url":"https:\/\/voomisupply.com\/products\/gibraltar-831405-g-shoulder-screw-3-8-in-black-oxide-steel","provider":"Voomi Supply","version":"1.0","type":"link"}