S-91286A805 5/8"-11 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 tensile strength of 150,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the zinc-flake coating extends service life in harsh environments, minimizing maintenance and replacement costs.
• High hardness (Rockwell C33) provides excellent wear resistance and durability, maintaining structural integrity under heavy loads.
• Coarse UNC threads with Class 2A fit allow for quick and easy installation while ensuring secure fastening in various materials.
• External hex drive design offers straightforward tool engagement and high torque capability for efficient assembly and disassembly.
• Full threading along the 1 1/4" length maximizes grip and load distribution, enhancing joint stability in demanding setups.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability for industrial use.

Professional Applications & Engineering Value

This Grade 8 steel hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where vibration, high loads, and environmental exposure are common. The zinc-flake coated finish provides robust protection against corrosion, significantly reducing downtime in corrosive settings like outdoor equipment or chemical processing plants. With its coarse UNC thread and Class 2A fit, it ensures rapid installation and reliable clamping force, while the external hex drive allows for high-torque applications without stripping. Ideal for structural frames, engine components, and industrial fastening systems, this screw delivers long-term reliability and meets rigorous ASME B18.2.1 specifications, making it a trusted choice for engineers seeking durability and compliance in demanding environments.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse threading with a 5/8"-11 size. It conforms to ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring high-quality performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and environmentally responsible industrial use.