S-91264A806 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in high-stress applications.
• Secure vibration-resistant fastening thanks to the integrated nylon pellet thread locker, maintaining integrity from -50° to 250°F.
• Enhanced corrosion resistance provided by the black oxide finish, extending service life in harsh industrial environments.
• Precise alignment and reduced wear achieved through the knurled socket head and Class 3A thread fit for accurate, repeatable assembly.
• Superior material durability from alloy steel with Rockwell C32 hardness, ensuring long-term reliability under heavy loads.
• Wide regulatory compliance including ASME B18.3, ASTM A574, RoHS 3, and REACH, meeting global industry standards.
• Optimized for easy installation with a standard hex drive and coarse UNC threads, reducing assembly time and effort.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical challenges in precision machinery and heavy-duty industrial equipment. The alloy steel construction, combined with a black oxide finish, provides excellent resistance to corrosion and wear, making it ideal for environments exposed to moisture, chemicals, or high friction. The Class 3A thread fit ensures tight tolerances, minimizing play and vibration in assemblies such as rotating shafts, pivots, and guides. Integrated nylon pellet thread locking technology prevents loosening under dynamic loads, which is crucial for automotive, aerospace, and manufacturing applications where safety and reliability are paramount. The knurled socket head enhances grip during installation, reducing the risk of tool slippage and damage, while the coarse thread design allows for quick and secure fastening in demanding conditions.

Specification Summary & Compliance

This shoulder screw features precise dimensional accuracy with a Class 3A thread fit and shoulder diameter tolerance of -0.004" to -0.002", ensuring consistent performance. It adheres to UNC coarse thread standards and is manufactured in compliance with ASME B18.3 and ASTM A574 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for global industrial use.