S-92620A778 9/16"-18 x 1" 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 steel construction with 150,000 psi tensile strength ensures reliable performance in the most demanding heavy-duty applications.
• Superior Corrosion Protection: Zinc yellow-chromate plating offers excellent resistance to rust and environmental degradation, extending the fastener's service life.
• Precise and Secure Fastening: Class 2A thread fit and UNF fine threads provide a tighter, more vibration-resistant connection compared to coarse threads.
• High Torque Application Ready: The external hex head and 13/16" head width allow for high torque application with standard tools, preventing stripping and ensuring a secure install.
• Exceptional Durability: A Rockwell C33 hardness rating guarantees high resistance to wear and deformation under stress.
• Full Thread Engagement: Being fully threaded along the 1" length ensures maximum grip and holding power across the entire fastened joint.
• Guaranteed Quality and Safety: Compliance with ASME B18.2.1, SAE J429, RoHS 3, and REACH ensures the screw meets rigorous industrial and environmental standards.

Professional Applications & Engineering Value

This 9/16"-18 UNF Grade 8 hex head screw is engineered for critical, high-stress assemblies where failure is not an option. The combination of high-carbon Grade 8 steel and a fine thread profile delivers superior clamping force and vibration resistance, making it ideal for heavy machinery, automotive frames, and structural steelwork. The zinc yellow-chromate plating is a key differentiator, providing a robust barrier against corrosion in harsh environments, from outdoor construction to industrial manufacturing. Its fully threaded design and external hex drive ensure easy installation and maximum thread engagement, solving common challenges of joint slippage and fastener loosening under dynamic loads. This screw provides a reliable, long-term fastening solution that reduces maintenance needs and downtime.

Specification Summary & Compliance

This fastener features a 9/16"-18 UNF thread with a Class 2A fit, ensuring precise dimensional accuracy and interchangeability. It is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications for Grade 8 hex cap screws. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for use in regulated markets.