{"product_id":"value-collection-581586ps-hex-socket-cap-screw-1-2-20-unf","title":"Value Collection 581586PS Hex Socket Cap Screw 1\/2-20 Unf","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION 581586PS is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling fixtures, and industrial equipment. It features a 1\/2-20 UNF thread and a 3-1\/4 inch length under head, with a 3\/8 inch hex drive socket. Manufactured from alloy steel with a black oxide finish, this fastener meets the dimensional and mechanical requirements of ASME\/ANSI B18.3 and ASTM A574. The black oxide coating provides moderate corrosion resistance and reduces light reflection in precision applications. It is partially threaded, which is standard for grip-length fasteners used where clamp load and shank shear strength both matter.\u003c\/p\u003e\u003cp\u003eThis cap screw suits applications across industrial maintenance, machine building, die and mold work, hydraulic assemblies, and general mechanical fabrication. The 1\/2-20 UNF fine thread pitch offers tighter thread engagement and greater tensile strength compared to coarse thread equivalents, making it a common choice in high-vibration environments. Machinists, millwrights, maintenance technicians, and field service mechanics install this style of fastener wherever a recessed hex drive and high clamping force are required. Sold individually, with a minimum order quantity of 5 units.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/2-20 UNF fine thread for high clamping load and vibration resistance\u003c\/li\u003e\n\u003cli\u003e3-1\/4 inch length under head with partial threading for shank grip strength\u003c\/li\u003e\n\u003cli\u003e3\/8 inch hex socket drive for standard Allen key or hex bit tooling\u003c\/li\u003e\n\u003cli\u003eAlloy steel construction meeting ASTM A574 mechanical requirements\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish for surface protection and reduced surface reflectivity\u003c\/li\u003e\n\u003cli\u003eConforms to ASME\/ANSI B18.3 dimensional standards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard ASME\/ANSI B18.3 hex socket cap screw for use in any 1\/2-20 UNF tapped hole requiring a partially threaded alloy steel fastener.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation requires a 3\/8 inch hex key or socket bit driver; confirm the tapped hole thread form is 1\/2-20 UNF before driving. Torque to the value specified in the applicable engineering documentation for the assembly — do not exceed the rated fastener capacity. Always de-energize, depressurize, or lock out the assembly before removing or replacing structural fasteners per applicable OSHA lockout\/tagout procedures. Inspect threads for contamination or damage before installation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/2-20 UNF\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\u003eDrive Type\u003c\/strong\u003e: Hex Socket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Size\u003c\/strong\u003e: 3\/8 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\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: 0.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 5\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 581586PS\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51714141094194,"sku":"581586PS","price":1422.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ffa9a754688eec011eed91ebaa8ee6c8.jpg?v=1788496787","url":"https:\/\/voomisupply.com\/products\/value-collection-581586ps-hex-socket-cap-screw-1-2-20-unf","provider":"Voomi Supply","version":"1.0","type":"link"}