{"product_id":"gibraltar-831408-g-shoulder-screw-3-8-in-black-oxide-steel","title":"Gibraltar 831408-G Shoulder Screw 3\/8 in Black Oxide Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe GIBRALTAR 831408-G is a steel shoulder screw with a black oxide finish, designed for precision fastening applications where a controlled shoulder diameter and length are required. The shoulder measures 3\/8 inches in diameter and 7\/8 inches in length, providing an accurate bearing or pivot surface for mating components. Thread size is 5\/16-18 UNC, driven by a 3\/16-inch hex socket. The head stands 1\/4 inch tall with a 9\/16-inch diameter. Built from grade 1137 steel, this screw suits machine shops, tool-and-die, fixture building, and general mechanical assembly work where dimensional precision matters.\u003c\/p\u003e\n\u003cp\u003eShoulder screws like the 831408-G are commonly used in industrial and mechanical applications requiring a smooth, precise shaft for bearings, bushings, linkages, or stripper bolts in die sets. They are installed in settings ranging from light manufacturing fixtures to equipment jigs and tooling. Trade professionals and machinists typically specify this type of fastener wherever a rotating or sliding interface is needed at a fixed location.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3\/8-inch shoulder diameter with 0.3750-inch decimal precision for accurate bearing fits\u003c\/li\u003e\n  \u003cli\u003e7\/8-inch shoulder length provides controlled engagement depth for mating parts\u003c\/li\u003e\n  \u003cli\u003e5\/16-18 UNC thread for secure fastening into tapped holes\u003c\/li\u003e\n  \u003cli\u003eBlack oxide finish for mild corrosion resistance and reduced light reflection\u003c\/li\u003e\n  \u003cli\u003eGrade 1137 steel construction for adequate strength in general mechanical applications\u003c\/li\u003e\n  \u003cli\u003e3\/16-inch hex socket drive for installation with standard Allen keys or hex drivers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or standard-spec shoulder screw for mechanical fixtures, tooling assemblies, and precision fastening applications requiring a 3\/8-inch shoulder diameter and 5\/16-18 UNC thread.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by machinists or maintenance technicians using a 3\/16-inch hex key or socket driver. Ensure the tapped receiving hole meets 5\/16-18 UNC thread specifications before installation. Do not overtighten, as the shoulder shoulder-to-hole clearance must be maintained for proper bearing or pivot function. Verify shoulder length is appropriate for the total stack height of mating components before final assembly.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProduct Type\u003c\/strong\u003e: Shoulder Screw\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: 1137\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShoulder Diameter\u003c\/strong\u003e: 3\/8 inches (0.3750 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShoulder Length\u003c\/strong\u003e: 7\/8 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\u003eHead Diameter\u003c\/strong\u003e: 9\/16 inches (0.5625 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 1\/4 inches (0.2500 inches)\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\u003eWeight\u003c\/strong\u003e: 1 pound\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: 831408-G\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GIBRALTAR","offers":[{"title":"Default Title","offer_id":51695743467826,"sku":"831408-G","price":37.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/09a093d249311f84f3d0f38fa203fa2a.jpg?v=1788337935","url":"https:\/\/voomisupply.com\/products\/gibraltar-831408-g-shoulder-screw-3-8-in-black-oxide-steel","provider":"Voomi Supply","version":"1.0","type":"link"}