S-8077A773 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh industrial environments and chemical exposure.
• Enhanced durability and reduced galling thanks to the Black Oxide finish, which also provides a sleek, non-reflective appearance.
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under heavy loads.
• Precise alignment and smooth rotation enabled by the 5/8" diameter shoulder with controlled tolerances for consistent bearing surfaces.
• Secure, high-torque installation using the 5/16" hex socket drive and knurled head, preventing tool slippage and improving grip.
• Fast assembly and reliable thread engagement with coarse 1/2"-13 UNC threads and Class 3A fit for quick, secure fastening.
• Compliance with global standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 Stainless Steel Shoulder Screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical stress. The Black Oxide finish not only enhances corrosion resistance but also reduces friction, making it ideal for moving parts in machinery, automation systems, and precision equipment. The 1/2"-13 UNC coarse thread and Class 3A thread fit ensure quick, secure fastening in high-vibration environments, while the precisely machined shoulder provides a stable pivot point for gears, linkages, and rotating assemblies. Its high tensile and shear strength supports demanding applications in manufacturing, automotive, and aerospace, where reliability and longevity are critical. The knurled head and hex drive facilitate easy installation and removal, reducing downtime in maintenance and assembly operations.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit for precise engagement and a shoulder diameter tolerance of -0.004" to -0.002" for consistent alignment. It adheres to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety requirements for industrial use.