{"product_id":"value-collection-581390pr-hex-socket-cap-screw-1-4-20-unc","title":"Value Collection 581390PR Hex Socket Cap Screw 1\/4-20 Unc","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION 581390PR is a hex socket cap screw designed for high-strength fastening in mechanical assemblies, tooling fixtures, and industrial equipment. It features a 1\/4-20 UNC thread with a 3\/16-inch hex drive socket and measures 8 inches in length under the head. The screw is partially threaded, which provides a smooth shank section that resists shear loads and helps align mated components. Constructed from alloy steel with a black oxide coating, it offers improved corrosion resistance and reduced surface reflectivity. Machinists, millwrights, and mechanical contractors install this type of fastener when torque capacity and a clean, recessed drive profile are required.\u003c\/p\u003e\n\u003cp\u003eThis cap screw is suited for use in machinery frames, jigs, fixtures, and structural bolting applications where a flush or recessed fastener head is needed. The 1\/4-20 UNC thread is a standard unified coarse thread widely used in North American manufacturing and fabrication. The partial threading is appropriate for applications that require a bearing shank or where thread engagement needs to be limited to a specific depth. The black oxide finish provides mild corrosion resistance and is commonly specified in shop environments where oil or grease is present.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/4-20 UNC thread for compatibility with standard unified coarse tapped holes\u003c\/li\u003e\n  \u003cli\u003e8-inch length under head suits deep-reach fastening applications\u003c\/li\u003e\n  \u003cli\u003ePartially threaded shank resists shear loads and aids component alignment\u003c\/li\u003e\n  \u003cli\u003e3\/16-inch hex socket drive for use with standard hex keys or socket drivers\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction provides high tensile and yield strength\u003c\/li\u003e\n  \u003cli\u003eBlack oxide coating reduces surface corrosion and minimizes light reflection in shop environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style and aftermarket replacement hex socket cap screw for standard 1\/4-20 UNC tapped assemblies meeting ASME\/ANSI B18.3 and ASTM A574 specifications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists, millwrights, or mechanical contractors using a 3\/16-inch hex key or socket driver. Always ensure the receiving tapped hole is clean and free of debris before driving the fastener. Consult the assembly drawing for required thread engagement depth, particularly for partially threaded screws. Follow applicable torque specifications provided by the equipment manufacturer or relevant ASME standards.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-20 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 8 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\u003eThreading\u003c\/strong\u003e: Partially Threaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Alloy Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish Coating\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: 581390PR\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51695385772338,"sku":"581390PR","price":2172.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6233c2e3ba1a51904b45e2e07f1db9d5.jpg?v=1788334481","url":"https:\/\/voomisupply.com\/products\/value-collection-581390pr-hex-socket-cap-screw-1-4-20-unc","provider":"Voomi Supply","version":"1.0","type":"link"}