{"product_id":"holo-krome-86646-hex-socket-cap-screw-5-16-18-unc-4-in","title":"Holo-krome 86646 Hex Socket Cap Screw 5\/16-18 Unc 4 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HOLO-KROME 86646 is a hex socket cap screw designed for secure, high-strength fastening in mechanical assemblies, tooling fixtures, and industrial equipment. It features a 5\/16-18 UNC thread size with a 4-inch length under the head and is partially threaded for proper clamping engagement. The 1\/4-inch hex drive accepts a standard hex key or Allen wrench. Constructed from alloy steel with a black oxide finish, this fastener delivers solid tensile strength and moderate corrosion resistance in dry or lightly oiled service environments. It meets ASME B18.3 and ASTM A574 standards.\u003c\/p\u003e\n\u003cp\u003eThis screw is suited for use in machine tool setups, jigs, dies, and general industrial fabrication where a recessed drive fastener is required. The partial threading is appropriate for through-hole and clearance-hole applications that require clamping force between mating surfaces. It is commonly installed by machinists, millwrights, maintenance technicians, and mechanical contractors working on equipment assembly or structural fixturing.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e5\/16-18 UNC thread form for compatibility with standard inch-series tapped holes\u003c\/li\u003e\n  \u003cli\u003e4-inch length under head with partial threading for proper clamping grip\u003c\/li\u003e\n  \u003cli\u003e1\/4-inch hex socket drive for use with Allen keys or hex bit drivers\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction provides high tensile and shear strength\u003c\/li\u003e\n  \u003cli\u003eBlack oxide finish offers mild corrosion resistance and low-glare appearance\u003c\/li\u003e\n  \u003cli\u003eMeets ASME B18.3 and ASTM A574 dimensional and mechanical standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard inch-series hex socket cap screw for use in any 5\/16-18 UNC tapped hole requiring a 4-inch partially threaded fastener per ASME B18.3 specifications.\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 bit driver. Ensure the mating tapped hole is clean and free of debris before driving. De-energize and lock out any equipment before fastener removal or replacement on live machinery. Torque to the value specified by the equipment manufacturer for 5\/16-18 alloy steel fasteners in the applicable 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\/16-18 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 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 B18.3, ASTM A574\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31161501\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: HOLO-KROME\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 86646\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HOLO-KROME","offers":[{"title":"Default Title","offer_id":51733520810290,"sku":"86646","price":11407.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2a8cec07676b915d009e3017ab471fff.jpg?v=1788756087","url":"https:\/\/voomisupply.com\/products\/holo-krome-86646-hex-socket-cap-screw-5-16-18-unc-4-in","provider":"Voomi Supply","version":"1.0","type":"link"}