S-8077A533 5/8"-11 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 wear resistance from the black oxide finish, providing added protection against rust and galling
• High-strength performance with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable load-bearing in demanding applications
• Precise alignment and smooth rotation enabled by the precision-ground shoulder with tight diameter tolerance
• Secure, non-slip installation thanks to the knurled socket head and 3/8" hex drive for superior torque transmission
• Fast assembly and disassembly with UNC coarse threads and Class 3A fit, reducing cross-threading risks
• Long-term operational reliability backed by Rockwell B79 hardness, maintaining structural integrity under repeated stress

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical alignment and pivot point challenges in industrial machinery. The black oxide finish enhances corrosion resistance, making it suitable for environments with moisture, chemicals, or high humidity. Its precision UNC coarse threads and Class 3A thread fit ensure quick, secure fastening in assemblies requiring frequent adjustments, such as conveyor systems, robotic arms, and precision tooling. The knurled socket head with hex drive allows for high-torque installation without slippage, while the accurately machined shoulder provides stable bearing surfaces for rotating components like gears, pulleys, and linkages. This design minimizes wear, reduces maintenance downtime, and extends equipment service life in heavy-duty fastener applications.

Specification Summary & Compliance

This shoulder screw features a 5/8"-11 UNC coarse thread with Class 3A precision fit, ensuring consistent engagement and load distribution. The shoulder diameter is manufactured to a tight tolerance of -0.004" to -0.002", and the shoulder length tolerance is held within -0.005" to 0.005" for exact alignment. It complies with ASME B18.3 specifications for dimensional accuracy and mechanical properties. Additionally, the screw is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for restricted substances.