S-92620A297 1 1/8"-7 x 3 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With a 150,000 PSI tensile rating, this screw withstands extreme loads, reducing the risk of fastener failure in critical applications.
• Superior Corrosion Resistance – Zinc yellow-chromate plating provides a durable barrier against rust and environmental degradation, extending service life in harsh conditions.
• High Hardness for Wear Resistance – Rockwell C33 hardness ensures the screw maintains its integrity under repetitive stress and high-torque installations.
• Reliable Thread Engagement – UNC coarse threading and Class 2A fit offer quick assembly and secure fastening, minimizing cross-threading and loosening in vibrating environments.
• Heavy-Duty Grade 8 Certification – Meets SAE J429 Grade 8 standards, guaranteeing consistent performance for demanding industrial and construction uses.
• Optimized Partial Threading – Allows for precise clamping force distribution, ideal for applications where unthreaded shank strength is crucial.
• Broad Regulatory Compliance – Conforms to ASME B18.2.1, RoHS 3, and REACH, ensuring safety and environmental standards are met for global supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses common challenges like vibration-induced loosening and corrosion in machinery, structural steel, and automotive assemblies. The zinc yellow-chromate plated steel finish combats moisture and chemical exposure, while the UNC coarse thread and external hex drive facilitate rapid installation with standard tools. Its partial threading design ensures maximum grip and shear strength, making it a reliable choice for high-strength fastening in construction equipment, mining machinery, and transportation infrastructure where durability and compliance with ASME B18.2.1 are paramount.

Specification Summary & Compliance

This screw features a 1 1/8"-7 UNC thread size with Class 2A fit for precise dimensional accuracy, and a length of 3 3/4" with a minimum thread length of 2 1/2". It adheres to ASME B18.2.1 and SAE J429 Grade 8 specifications, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and performance reliability.