{"product_id":"value-collection-581244br-hex-socket-cap-screw-2-4-1-2-unc","title":"Value Collection 581244BR Hex Socket Cap Screw 2-4-1\/2 Unc","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION 581244BR is a heavy-duty hex socket cap screw designed for high-strength fastening applications. Manufactured from alloy steel with a black oxide finish, this screw measures 20 inches in length under the head and is threaded to the 2-4-1\/2 UNC standard, making it suitable for large-diameter, coarse-thread installations. The 1-1\/2 inch hex drive socket accepts a standard hex key or Allen driver of matching size. It is partially threaded, which is typical for long-body cap screws where a smooth shank provides shear resistance in structural joints. Machinists, millwrights, and heavy equipment technicians are the primary installers of this fastener class.\u003c\/p\u003e\n\u003cp\u003eThis screw is used in industrial machinery assembly, structural steel fabrication, and heavy equipment maintenance where large-diameter fasteners are required. The 2-4-1\/2 UNC thread designation indicates a 2-inch nominal diameter with 4-1\/2 threads per inch, a coarse-thread series suited for thick or tapped-steel applications. The black oxide finish provides moderate corrosion resistance and reduces light reflection in precision equipment environments. Typical install scenarios include press frames, gearbox housings, large conveyor structures, and similar heavy-duty mechanical assemblies.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e2-4-1\/2 UNC thread form — 2-inch nominal diameter, 4-1\/2 threads per inch coarse series\u003c\/li\u003e\n  \u003cli\u003e20-inch length under head for deep-reach fastening applications\u003c\/li\u003e\n  \u003cli\u003ePartially threaded shank provides shear strength in structural connections\u003c\/li\u003e\n  \u003cli\u003e1-1\/2 inch hex socket drive for use with standard hex keys or socket drivers\u003c\/li\u003e\n  \u003cli\u003eAlloy steel construction for high tensile and proof load performance\u003c\/li\u003e\n  \u003cli\u003eBlack oxide coating for moderate corrosion resistance and reduced surface reflectivity\u003c\/li\u003e\n  \u003cli\u003eMeets ASME\/ANSI B18.3 and ASTM A574 fastener standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style and aftermarket replacement hex socket cap screw for industrial machinery, structural assemblies, and heavy equipment that require a 2-4-1\/2 UNC partially threaded fastener with a 1-1\/2 inch hex drive.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation of large-diameter socket cap screws of this class is typically performed by millwrights, machinists, or heavy equipment mechanics using calibrated torque tools appropriate for the application. Always de-energize and lock out the equipment before fastener removal or installation per applicable OSHA lockout\/tagout procedures. Ensure mating tapped holes meet the UNC 2-4-1\/2 thread specification and are clean and free of debris before driving. Do not use impact tools beyond what the joint design specifies, and consult applicable structural or equipment drawings for torque requirements.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 2-4-1\/2 UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 20 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: 1-1\/2 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 Coating\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: 0.01 pounds\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: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 581244BR\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51711305220402,"sku":"581244BR","price":328.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e2816fc3ea1a0de3ebbded6c00312548_6d08d621-6aae-4304-a869-7c289c1b3dbd.jpg?v=1788475503","url":"https:\/\/voomisupply.com\/products\/value-collection-581244br-hex-socket-cap-screw-2-4-1-2-unc","provider":"Voomi Supply","version":"1.0","type":"link"}