S-91251A932 1"-8 x 8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – Withstands extreme loads up to 170,000 PSI, ideal for heavy-duty applications requiring reliable, long-term fastening.
• Superior Corrosion Resistance – Black-oxide finish on alloy steel provides enhanced protection against rust and wear in harsh industrial environments.
• High-Precision Thread Fit – Class 3A thread fit ensures tight, secure connections with minimal risk of loosening under vibration or dynamic loads.
• Optimized Torque Transmission – 3/4" hex drive design allows for high torque application, reducing the risk of stripping and improving installation efficiency.
• Robust Material Hardness – Rockwell C37 hardness offers excellent durability and resistance to deformation, maintaining performance under repeated use.
• Versatile Thread Design – 1"-8 coarse UNRC threads enable quick assembly and disassembly, reducing labor time in maintenance and machinery setups.
• Regulatory Compliance Assurance – Meets ASTM A574, RoHS 3, and REACH standards, ensuring safety and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy machinery, automotive assembly, and structural frameworks where vibration resistance and high clamp load are paramount. The coarse UNRC thread design facilitates rapid installation in tough materials, reducing assembly time while the Class 3A fit minimizes backlash for stable connections. Its partially threaded configuration allows precise load distribution, preventing stress concentration. Ideal for use in construction equipment, industrial presses, and precision tooling, this fastener ensures reliable performance under high-stress conditions, backed by 170,000 PSI tensile strength and corrosion-resistant black-oxide coating for extended service life in demanding environments.

Specification Summary & Compliance

This socket head cap screw features a 1"-8 coarse UNRC thread with Class 3A fit for high precision, and a partially threaded rod type to optimize load-bearing capacity. It adheres to ASTM A574 specifications for material and manufacturing consistency, and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for international industrial applications.