S-92620A585 5/16"-18 x 1 1/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Grade 8 classification and 150,000 psi tensile strength for reliable performance in high-stress applications.
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial environments.
• Optimized thread engagement through UNC coarse threading and Class 2A fit ensures secure fastening and vibration resistance.
• High hardness rating of Rockwell C33 maintains structural integrity under repeated stress and prevents thread deformation.
• Full threading design allows for maximum grip length and uniform stress distribution across the entire fastener.
• External hex drive compatibility enables quick installation and removal with standard tools, reducing assembly time.
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for quality and environmental safety.

Professional Applications & Engineering Value

Engineered for demanding industrial scenarios, these Grade 8 hex head screws deliver critical reliability where failure is not an option. The zinc yellow-chromate plated steel construction provides a robust barrier against oxidation and chemical exposure, making them ideal for outdoor machinery, automotive assemblies, and structural frameworks. The 5/16"-18 UNC coarse thread configuration ensures rapid installation and superior holding power in materials prone to vibration loosening. With fully threaded design and external hex drive, maintenance teams benefit from consistent clamping force and tool accessibility in confined spaces. These fasteners solve common engineering challenges by combining high tensile strength with corrosion protection, effectively reducing replacement frequency in heavy-equipment manufacturing, construction projects, and transportation infrastructure.

Specification Summary & Compliance

This 1 1/4" length hex head screw maintains precise Class 2A thread fit tolerances per UNC standards with right-hand threading orientation. Manufacturing conforms to ASME B18.2.1 dimensional specifications and SAE J429 Grade 8 mechanical properties. The product is verified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to international hazardous substance restrictions and chemical safety protocols.