{"product_id":"holo-krome-73138-hex-socket-cap-screw-1-2-20-unf-alloy-steel","title":"Holo-krome 73138 Hex Socket Cap Screw 1\/2-20 Unf Alloy Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HOLO-KROME 73138 is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, equipment maintenance, and industrial fabrication. It features a 1\/2-20 UNF thread size with a 2-inch length under head and is fully threaded along its entire shaft. A 3\/8-inch hex drive socket is required for installation. Manufactured from alloy steel with a black oxide finish, the 73138 meets ASME B18.3 and ASTM A574 standards, making it suitable for load-bearing and torque-critical connections across a wide range of trade and industrial uses.\u003c\/p\u003e\n\u003cp\u003eThis screw is used in mechanical, HVAC, plumbing, and electrical panel assemblies where a flush or low-profile fastener head and high clamp load are required. The 1\/2-20 UNF fine thread pitch provides greater thread engagement and improved resistance to loosening under vibration compared to coarse thread equivalents. Licensed trades including HVAC technicians, pipefitters, and electricians commonly specify this fastener type when securing equipment frames, brackets, and access panels. It is sold in a minimum order quantity of 50 pieces per purchase.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/2-20 UNF fully threaded shaft for maximum thread engagement\u003c\/li\u003e\n  \u003cli\u003e2-inch length under head suits medium-depth fastening applications\u003c\/li\u003e\n  \u003cli\u003e3\/8-inch internal hex drive accepts standard hex key and socket tooling\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction meets ASTM A574 high-strength fastener requirements\u003c\/li\u003e\n  \u003cli\u003eBlack oxide coating provides mild corrosion resistance and reduces light reflection\u003c\/li\u003e\n  \u003cli\u003eConforms to ASME B18.3 dimensional standards for socket cap screws\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style and replacement fastener for mechanical assemblies requiring 1\/2-20 UNF hex socket cap screws per ASME B18.3 dimensional standards.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed with a 3\/8-inch hex key or socket driver; ensure the drive tool is fully seated before applying torque to avoid rounding the socket. De-energize or lock out any equipment before accessing fastened assemblies per applicable OSHA and NFPA 70E procedures. Inspect threads and mating surfaces for damage or contamination before assembly. Minimum order quantity of 50 pieces applies to this SKU.\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: 2 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 B18.3, ASTM A574\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31161501\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 50 pieces\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: 73138\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HOLO-KROME","offers":[{"title":"Default Title","offer_id":51743480054066,"sku":"73138","price":13801.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5cb6453dfdbf237b861389c120032cce.jpg?v=1788847499","url":"https:\/\/voomisupply.com\/products\/holo-krome-73138-hex-socket-cap-screw-1-2-20-unf-alloy-steel","provider":"Voomi Supply","version":"1.0","type":"link"}