S-91259A860 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in heavy-duty applications.
• Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments.
• Precise alignment and reduced wear with a 6" shoulder length and tight tolerances, ensuring smooth rotational movement and minimal play.
• High hardness and durability with Rockwell C32 rating, providing excellent resistance to deformation under stress.
• Secure and efficient installation via the hex drive and knurled head, allowing for easy torque application and reduced slippage.
• Accurate thread engagement with Class 3A fit and UNC coarse threads, offering quick assembly and high vibration resistance.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered from alloy steel to address critical industrial challenges, such as misalignment and component wear in rotating assemblies. The 6" shoulder length with precise diameter tolerances provides a stable bearing surface, reducing friction and extending machinery life in applications like conveyor systems, robotics, and precision machinery. The black oxide finish enhances corrosion resistance, ideal for environments exposed to moisture or chemicals. With a hex drive and knurled head, it ensures secure handling during installation, minimizing downtime. This shoulder screw delivers reliable performance in heavy-duty settings, supporting efficient operations and reducing maintenance costs.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC coarse threads for precise engagement, and shoulder dimensions include a diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" to ensure accuracy. Manufactured to meet ASME B18.3 specifications, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, guaranteeing environmental safety and regulatory adherence.