S-91257A860 3/4"-10 x 6 1/2" 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, these screws withstand extreme loads, reducing the risk of failure in demanding applications.
• Superior Corrosion Resistance: The zinc yellow-chromate plating provides long-lasting protection against rust and environmental degradation, extending service life.
• High Hardness for Durability: Rockwell C33 hardness ensures the screw maintains its shape and thread integrity under high stress and repeated use.
• Reliable Thread Engagement: UNC coarse threads and Class 2A fit offer quick assembly and secure fastening, minimizing loosening in vibrating environments.
• Heavy-Duty Grade 8 Compliance: Meets SAE J429 Grade 8 standards, guaranteeing consistent performance for critical industrial and machinery applications.
• Easy Installation with External Hex Drive: The 1 1/8" hex head allows for high-torque application using standard tools, speeding up assembly processes.
• Environmental and Safety Compliance: RoHS 3 and REACH compliant, ensuring safe use in regulated industries without hazardous substances.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in construction, machinery, and automotive sectors where high tensile strength and corrosion resistance are paramount. The steel material combined with zinc yellow-chromate plating ensures durability in harsh environments, preventing fastener degradation that can lead to equipment downtime. Its UNC coarse thread and Class 2A fit facilitate rapid, secure installations, reducing assembly time while maintaining reliability under vibration. Partially threaded design concentrates strength where needed, making it ideal for structural fastening and high-stress connections, providing engineers with a dependable solution that meets ASME B18.2.1 specifications for consistent quality and performance.

Specification Summary & Compliance

This screw features a 3/4"-10 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy, ensuring reliable engagement. It complies with ASME B18.2.1 and SAE J429 Grade 8 standards, confirming adherence to rigorous manufacturing and strength requirements. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental regulations for safe usage in various industries.