{"product_id":"value-collection-581881br-hex-socket-cap-screw-1-1-8-7-unc","title":"Value Collection 581881BR Hex Socket Cap Screw 1-1\/8-7 Unc","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION 581881BR is a partially threaded hex socket cap screw designed for heavy-duty fastening applications. Manufactured from alloy steel with a black oxide finish, this fastener delivers high tensile strength and moderate corrosion resistance in a compact, recessed-drive format. The screw features a 1-1\/8-7 UNC thread size and measures 8 inches in length under the head, making it suitable for thick-section assemblies and structural bolted joints. It is driven with a 7\/8-inch hex key. Meets ASME\/ANSI B18.3 and ASTM A574 standards, which define dimensional tolerances and mechanical requirements for socket cap screws.\u003c\/p\u003e\u003cp\u003eThis fastener is used across a broad range of industrial and mechanical assembly applications. Typical installations include machine frames, jigs and fixtures, die sets, hydraulic equipment, and structural steel assemblies where a flush or low-profile head is required. The partially threaded shank provides a smooth bearing surface that resists shear loads and allows precise clamping without thread engagement through the full grip length. Millwrights, machinists, and maintenance mechanics commonly specify this type of fastener in manufacturing and heavy equipment environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1-1\/8-7 UNC thread form for use with standard UN tapped holes\u003c\/li\u003e\n\u003cli\u003e8-inch length under head accommodates thick-section or stacked assemblies\u003c\/li\u003e\n\u003cli\u003ePartially threaded shank provides shear resistance and controlled clamp length\u003c\/li\u003e\n\u003cli\u003e7\/8-inch hex drive for high-torque installation with a standard hex key\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish reduces light reflection and offers mild corrosion resistance\u003c\/li\u003e\n\u003cli\u003eMeets ASME\/ANSI B18.3 and ASTM A574 for dimensional and mechanical compliance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in 1-1\/8-7 UNC tapped holes in machine structures, fixtures, and mechanical assemblies requiring a socket head cap screw profile per ASME\/ANSI B18.3.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by machinists or millwrights using a calibrated torque wrench with a 7\/8-inch hex bit. Always verify that the tapped hole depth and thread engagement length meet ASME or applicable engineering specifications before torquing. De-energize and lock out all equipment before accessing any fastener locations on powered machinery. Inspect the fastener and mating threads for damage or contamination prior to assembly.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1-1\/8-7 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Under Head\u003c\/strong\u003e: 8 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: 7\/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 and ASTM A574\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.02 pounds\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: 581881BR\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51692595118386,"sku":"581881BR","price":41.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/13ddd3e6a6daa78a9d2c543a2010e3d5.jpg?v=1788299674","url":"https:\/\/voomisupply.com\/products\/value-collection-581881br-hex-socket-cap-screw-1-1-8-7-unc","provider":"Voomi Supply","version":"1.0","type":"link"}