{"product_id":"value-collection-221139pr-shoulder-screw-1-2-in-alloy-steel","title":"Value Collection 221139PR Shoulder Screw 1\/2 in Alloy Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION 221139PR is a Grade 8 alloy steel shoulder screw with a 0.500 inch shoulder diameter and a 3.5 inch shoulder length. The shoulder provides a precise, hardened bearing surface used as a pivot point, axle, or locating pin in mechanical assemblies. The fastener features a hex socket drive accepting a 1\/4 inch hex key and an uncoated finish. The 3\/8-16 UNC threaded section clamps the screw securely into a tapped hole, while the shoulder extends above the mating surface to guide moving components. Licensed mechanics, millwrights, and maintenance technicians are the typical installers for this type of fastener.\u003c\/p\u003e\n\u003cp\u003eShoulder screws of this pattern see widespread use in jigs and fixtures, die sets, punch press tooling, conveyor linkages, and general precision mechanical assemblies where a controlled-clearance bearing surface is required. The 0.500 inch shoulder diameter and 3.5 inch shoulder length suit mid-range stroke or linkage applications. The uncoated Grade 8 alloy steel construction is appropriate for dry or lightly lubricated mechanical environments where high shear strength and dimensional precision are priorities. This fastener ships individually but carries a minimum order quantity of 10 units.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e0.500 inch shoulder diameter provides a precision bearing and locating surface\u003c\/li\u003e\n  \u003cli\u003e3.5 inch shoulder length suits medium-depth pivot and linkage applications\u003c\/li\u003e\n  \u003cli\u003eGrade 8 alloy steel construction delivers high tensile and shear strength\u003c\/li\u003e\n  \u003cli\u003e3\/8-16 UNC thread engages standard tapped holes for secure clamping\u003c\/li\u003e\n  \u003cli\u003e1\/4 inch hex socket drive for precise torque application with a hex key or hex-bit driver\u003c\/li\u003e\n  \u003cli\u003eMeets ANSI B18.3, ASME\/ANSI B18.3, and ASTM A574 standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-fit shoulder screw for mechanical assemblies requiring a 1\/2 inch diameter shoulder, 3\/8-16 UNC thread, and Grade 8 alloy steel construction per ANSI B18.3 and ASTM A574 specifications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified mechanics or maintenance technicians using a 1\/4 inch hex key or hex-bit driver. Ensure the receiving tapped hole is clean and free of debris before driving the fastener. Do not exceed the design clamping load for the 3\/8-16 thread class. The shoulder must be free to rotate or slide within its mating bore without additional thread engagement interfering with shoulder clearance.\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\u003eShoulder Diameter\u003c\/strong\u003e: 0.500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShoulder Length\u003c\/strong\u003e: 3.5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 3\/8-16 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Alloy Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: 8\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: 1\/4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.750 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 0.3125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.02 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI B18.3, ASME\/ANSI B18.3, ASTM A574\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31161619\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: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 221139PR\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51695141585202,"sku":"221139PR","price":7274.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/25c64d3768e01061eb7af18eba05897f.jpg?v=1788331670","url":"https:\/\/voomisupply.com\/products\/value-collection-221139pr-shoulder-screw-1-2-in-alloy-steel","provider":"Voomi Supply","version":"1.0","type":"link"}