S-8077A551 5/8"-11 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in heavy-duty applications.
• Precise thread engagement with Class 3A fit and UNC coarse threads for secure fastening and vibration resistance.
• Enhanced installation grip from the knurled socket head and 3/8" hex drive, reducing tool slippage and improving assembly efficiency.
• Accurate shoulder positioning with tight diameter and length tolerances, ensuring consistent alignment in machined components.
• Compliance with major industrial standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and regulatory adherence.
• Optimized for high-stress applications with a Rockwell B79 hardness, providing durability against wear and deformation.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical challenges in precision assembly and heavy machinery. The 316 Stainless Steel material, combined with a Black Oxide finish, delivers outstanding corrosion resistance, making it suitable for marine, chemical processing, and outdoor equipment where moisture and chemicals are prevalent. The knurled socket head and hex drive design prevent cam-out during torque application, enhancing worker safety and reducing installation errors. With a Class 3A thread fit and coarse UNC threads, it ensures rapid assembly and reliable retention in high-vibration environments like automotive drivetrains or industrial robots. The precisely machined shoulder provides stable bearing surfaces for rotating parts, minimizing misalignment and extending component life in demanding applications such as conveyor systems and precision instruments.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise tolerance control. Key dimensional attributes include a thread size of 5/8"-11 UNC, shoulder diameter of 3/4" (tolerance: -0.004" to -0.002"), and shoulder length of 1 7/8" (tolerance: -0.005" to 0.005"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.