S-92620A539 1/4"-20 x 5/8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for heavy-duty applications with Grade 8 classification, providing 150,000 psi tensile strength and Rockwell C33 hardness to withstand high stress and prevent failure.
• Superior corrosion resistance due to zinc yellow-chromate plating, extending service life in harsh industrial environments and reducing maintenance needs.
• Reliable and precise fit with Class 2A thread fit and UNC coarse threading, ensuring easy installation and secure fastening without cross-threading.
• High torque capability from the external hex drive and hex head design, allowing for efficient tightening with standard tools in demanding assembly operations.
• Full threading for maximum grip along the entire 5/8" length, offering consistent holding power and versatility across various material thicknesses.
• Compliance with industry standards including ASME B18.2.1 and SAE J429, guaranteeing consistent quality, interchangeability, and performance in mechanical systems.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, ensuring safe use in regulated industries without hazardous substances.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in industrial and mechanical assemblies where high tensile strength and durability are paramount. Made from high-strength steel and featuring a zinc yellow-chromate plating, it provides excellent resistance to corrosion, reducing downtime in environments exposed to moisture or chemicals. The UNC coarse thread and Class 2A fit ensure quick, reliable installation with minimal risk of stripping, while the external hex drive allows for high torque application, making it ideal for heavy machinery, automotive systems, and construction equipment. By meeting ASME B18.2.1 and SAE J429 standards, it delivers consistent performance, helping engineers and procurement specialists minimize assembly failures and optimize long-term reliability in demanding applications.

Specification Summary & Compliance

This fastener adheres to precise dimensional tolerances, including Class 2A thread fit for consistent engagement and UNC thread standards for broad compatibility. It is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications, ensuring reliable mechanical properties. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for global industrial use.