{"product_id":"value-collection-mp39457-hex-head-cap-screw-5-8-18-x-4-in-grade-8","title":"Value Collection MP39457 Hex Head Cap Screw 5\/8-18 X 4 in Grade 8","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION MP39457 is a partially threaded hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. This fastener measures 5\/8-18 (UNF thread) with a 4-inch length under head and is manufactured from Grade 8 steel with a zinc yellow dichromate finish that provides corrosion resistance and a distinctive gold-yellow appearance for identification. Conforming to ASME B18.2.1 standards, this screw is suited for demanding load-bearing connections where a high proof load and shear strength are required. Sold in a package quantity of 10.\u003c\/p\u003e\n\u003cp\u003eThis cap screw is used in applications requiring a unified fine thread (UNF) fastener with a high tensile strength rating. Partial threading leaves a smooth shank section near the head, which helps maintain alignment in close-tolerance bores and resists shear forces more effectively than a fully threaded fastener. Typical applications include heavy equipment fabrication, machinery assembly, automotive drivetrain work, and structural mechanical joints where Grade 8 specification is required by design or code.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eGrade 8 steel construction provides high tensile and proof load strength for demanding fastening applications\u003c\/li\u003e\n  \u003cli\u003eZinc yellow dichromate finish offers corrosion resistance and serves as a visual Grade 8 identifier\u003c\/li\u003e\n  \u003cli\u003ePartially threaded shank improves shear resistance and alignment in precision bores\u003c\/li\u003e\n  \u003cli\u003e5\/8-18 UNF thread form for fine-pitch engagement with reduced backlash and vibration loosening\u003c\/li\u003e\n  \u003cli\u003eMeets ASME B18.2.1 dimensional standards for consistent hex head geometry and thread form\u003c\/li\u003e\n  \u003cli\u003ePackage quantity of 10 per order\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard inch-series hex head cap screw compatible with any 5\/8-18 UNF tapped hole or matching hex nut in applications requiring Grade 8 strength and ASME B18.2.1 compliance.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by a qualified mechanic or millwright using a standard hex wrench or impact socket sized for a 5\/8-inch hex head cap screw. Always verify mating thread class and hole depth before installation to avoid cross-threading or bottoming out. Torque to the value specified by the equipment manufacturer or applicable engineering standard for Grade 8 fasteners. Use appropriate thread lubricant or dry torque values as specified by the joint design.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/8-18\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\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: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: Grade 8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish Coating\u003c\/strong\u003e: Zinc Yellow Dichromate\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensional Standard\u003c\/strong\u003e: ASME B18.2.1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 10\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: MP39457\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51716028105010,"sku":"MP39457","price":48.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/122303ce5c5ab9d7abb53d3194c3b533.jpg?v=1788521227","url":"https:\/\/voomisupply.com\/products\/value-collection-mp39457-hex-head-cap-screw-5-8-18-x-4-in-grade-8","provider":"Voomi Supply","version":"1.0","type":"link"}