{"product_id":"value-collection-581582ps-hex-socket-cap-screw-1-2-20-unf","title":"Value Collection 581582PS Hex Socket Cap Screw 1\/2-20 Unf","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION 581582PS is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling fixtures, and equipment maintenance. The screw features a 1\/2-20 UNF thread size and measures 1.375 inches in length under the head, with full threading along the entire shank. Drive engagement is made with a 3\/8-inch hex key. Constructed from alloy steel with a black oxide finish, the fastener delivers solid corrosion resistance and meets the dimensional and mechanical requirements of ASME\/ANSI B18.3 and ASTM A574. This type of fastener is installed by machinists, millwrights, field technicians, and maintenance mechanics across industrial and commercial service environments.\u003c\/p\u003e\n\u003cp\u003eThe 581582PS is suited for applications requiring a strong, recessed-drive cap screw in close-tolerance assemblies. The fine 1\/2-20 UNF thread pitch provides tighter clamping control and greater resistance to vibration-induced loosening compared to coarse-thread alternatives. Typical use cases include machine frames, hydraulic component mounting, fixture plates, and structural mechanical joints where a flush or countersunk fastener head is required. The black oxide finish reduces light reflection and provides a degree of surface protection in dry or lightly oiled service conditions.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/2-20 UNF fine thread for precise clamping and vibration resistance\u003c\/li\u003e\n  \u003cli\u003eFully threaded shank, 1.375 inches in length under head\u003c\/li\u003e\n  \u003cli\u003e3\/8-inch hex drive for standard Allen key or hex bit engagement\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction rated to ASTM A574 mechanical requirements\u003c\/li\u003e\n  \u003cli\u003eBlack oxide finish for surface protection and low-reflectance appearance\u003c\/li\u003e\n  \u003cli\u003eConforms to ASME\/ANSI B18.3 dimensional standards\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 suitable for any application requiring a 1\/2-20 UNF fully threaded fastener with a 3\/8-inch hex drive and 1.375-inch length under head.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed with a 3\/8-inch hex key or Allen-drive bit. Always ensure the mating threaded hole is clean, properly tapped to 1\/2-20 UNF, and free of debris before installation. Power down or de-energize any equipment before fastener service work begins. Do not exceed the torque rating specified by the equipment manufacturer for the joint being assembled.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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: 1.375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreading\u003c\/strong\u003e: Fully 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: 3\/8 inches\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 and ASTM A574\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1 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: 581582PS\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51717431591218,"sku":"581582PS","price":1479.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/95cba60a2d23fbceb9e2c33366e7953c.jpg?v=1788540358","url":"https:\/\/voomisupply.com\/products\/value-collection-581582ps-hex-socket-cap-screw-1-2-20-unf","provider":"Voomi Supply","version":"1.0","type":"link"}