{"product_id":"value-collection-581687ps-hex-socket-cap-screw-5-8-18-unf","title":"Value Collection 581687PS Hex Socket Cap Screw 5\/8-18 Unf","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION 581687PS is a partially threaded hex socket cap screw designed for high-strength fastening applications in mechanical assembly, maintenance, and fabrication work. Threaded to 5\/8-18 UNF specification, this fastener measures 5.5 inches under the head and is driven with a 1\/2-inch hex key. Constructed from alloy steel with a black oxide coating, it delivers solid corrosion resistance alongside the mechanical strength required for demanding industrial and equipment assembly environments. The ASME\/ANSI B18.3 and ASTM A574 standards govern dimensional and strength requirements for this screw.\u003c\/p\u003e\n\u003cp\u003eThis cap screw is suited for use in general industrial assembly, machine building, tooling fixtures, and equipment maintenance where a fine-thread UNF engagement is required for precise torque control and resistance to loosening under vibration. The partial threading allows for shoulder-style clamping and alignment in clearance-hole applications. Machinists, millwrights, and maintenance technicians typically install this fastener using standard hex key tooling.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e5\/8-18 UNF fine thread for tight tolerances and vibration-resistant engagement\u003c\/li\u003e\n  \u003cli\u003e5.5-inch length under head accommodates thicker material stacks\u003c\/li\u003e\n  \u003cli\u003ePartial threading supports clearance-hole and shoulder-clamping installations\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction meets ASTM A574 mechanical strength requirements\u003c\/li\u003e\n  \u003cli\u003eBlack oxide finish provides mild corrosion resistance and reduces light glare\u003c\/li\u003e\n  \u003cli\u003eDriven with a 1\/2-inch hex key for positive, slip-resistant torque application\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard ASME\/ANSI B18.3 hex socket cap screw for use in any 5\/8-18 UNF tapped hole requiring a partially threaded alloy steel fastener with a 1\/2-inch internal hex drive.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed with a 1\/2-inch hex key or Allen driver; ensure the drive tool is fully seated to avoid cam-out and socket damage. Verify thread engagement depth in the tapped hole before applying final torque. De-energize and lock out any equipment before replacing fasteners in live assemblies. Apply a thread lubricant or anti-seize as appropriate for the base material to prevent galling during installation.\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 UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 5.5 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: 1\/2 inch\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\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: 0.5 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: 581687PS\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51718238699826,"sku":"581687PS","price":18.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/98fdc36dd6dd4cc97113d7d390abc441.jpg?v=1788550993","url":"https:\/\/voomisupply.com\/products\/value-collection-581687ps-hex-socket-cap-screw-5-8-18-unf","provider":"Voomi Supply","version":"1.0","type":"link"}