{"product_id":"value-collection-011221pr-hex-socket-cap-screw-5-16-18-unc","title":"Value Collection 011221PR Hex Socket Cap Screw 5\/16-18 Unc","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION 011221PR is a 5\/16-18 UNC hex socket cap screw designed for secure, high-torque fastening in mechanical, structural, and industrial assemblies. Measuring 3-1\/4 inches in length under head, this partially threaded fastener is driven with a 1\/4 inch hex key. The alloy steel construction provides high tensile strength, while the black oxide coating offers mild corrosion resistance and a low-reflectance surface finish. It meets ASME\/ANSI B18.3 and ASTM A574 standards, making it appropriate for applications where rated mechanical fasteners are specified. Machinists, millwrights, equipment technicians, and general contractors commonly use this type of socket head cap screw in precision assemblies and machinery mounting.\u003c\/p\u003e\n\u003cp\u003eThis fastener is suited for use in machine frames, fixture plates, jigs, tooling, and structural assemblies where a recessed drive head is preferred over an external hex or slotted style. The partial threading allows the unthreaded shank to act as a shoulder in clearance holes, providing accurate alignment and shear resistance. It is appropriate for both light industrial and heavy-duty mechanical applications where high clamping force is required in tight or recessed spaces.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e5\/16-18 UNC thread size for standard inch-series tapped holes\u003c\/li\u003e\n  \u003cli\u003e3-1\/4 inch length under head with partial threading for shank-fit clearance applications\u003c\/li\u003e\n  \u003cli\u003e1\/4 inch hex drive socket head for use with standard hex keys or Allen drivers\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction rated to ASTM A574 for high tensile and proof load strength\u003c\/li\u003e\n  \u003cli\u003eBlack oxide finish for mild corrosion resistance and reduced surface glare\u003c\/li\u003e\n  \u003cli\u003eConforms to ASME\/ANSI B18.3 dimensional standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard ASME\/ANSI B18.3 socket head cap screw for use in any 5\/16-18 UNC tapped hole requiring a partially threaded, hex-drive fastener.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed with a 1\/4 inch hex key or Allen-style driver. Ensure the mating tapped hole is clean and properly formed to 5\/16-18 UNC specification before driving. Apply thread-locking compound or hardened washers as required by the assembly specification. Do not exceed the torque rating of the mating material, and never use an impact driver without a rated hex bit socket adapter.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/16-18 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 3-1\/4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreading\u003c\/strong\u003e: Partially Threaded\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 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Alloy Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black Oxide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFastener Standard\u003c\/strong\u003e: ASME\/ANSI B18.3, ASTM A574\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 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: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 011221PR\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51712511541554,"sku":"011221PR","price":8449.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/1c5f0eb049274b02f05cf8843c52ed63.jpg?v=1788486350","url":"https:\/\/voomisupply.com\/products\/value-collection-011221pr-hex-socket-cap-screw-5-16-18-unc","provider":"Voomi Supply","version":"1.0","type":"link"}