S-92620A318 1 1/8"-7 x 7" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: Grade 8 classification and 150,000 psi tensile strength ensure reliable performance under extreme stress, reducing the risk of fastener failure in critical applications.
• Superior Corrosion Protection: Zinc yellow-chromate plating offers excellent resistance to rust and environmental degradation, extending service life in harsh industrial or outdoor settings.
• Optimized Thread Engagement: Coarse UNC threads and Class 2A fit provide secure, vibration-resistant connections with easier alignment and installation compared to fine-thread alternatives.
• High-Torque Installation Capability: External hex drive and large 1 11/16" head width allow for high tightening torque application with standard tools, ensuring a tight, durable clamp.
• Enhanced Durability & Wear Resistance: Rockwell C33 hardness and steel construction resist deformation, galling, and wear, maintaining structural integrity through repeated use.
• Versatile Partial Threading: Partially threaded design with 2 3/4" minimum thread length enables precise clamping on thick materials without unnecessary thread engagement.
• Regulatory & Quality Assurance: Compliance with ASME B18.2.1, SAE J429, RoHS 3, and REACH ensures material safety, performance consistency, and suitability for regulated industries.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address common industrial challenges such as joint integrity under dynamic loads and environmental corrosion. The steel core, hardened to Rockwell C33, provides the necessary toughness for heavy machinery, structural steel framing, and high-vibration equipment where 150,000 psi tensile strength prevents catastrophic failures. The zinc yellow-chromate plating acts as a sacrificial barrier, significantly reducing oxidation in humid or chemically aggressive environments, which is critical for outdoor infrastructure, marine applications, and automotive assemblies. The 1-1/8"-7 UNC coarse thread and Class 2A fit ensure rapid installation with standard wrenches while maintaining clamping force, minimizing assembly time in construction, mining, and manufacturing sectors. Its partial threading allows unthreaded shank sections to bear shear loads effectively, making it ideal for bolted connections requiring both strength and precision.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards with UNC coarse threads in a Class 2A fit for consistent interchangeability and assembly ease. Manufacturing and material specifications strictly follow ASME B18.2.1 and SAE J429 for Grade 8 mechanical properties. The product is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for hazardous substances, supporting global supply chain requirements.