S-8077A766 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 prolonged outdoor exposure.
• Enhanced durability and wear resistance from the black oxide finish, which also provides a sleek, low-reflective appearance.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for demanding applications without failure.
• Precise alignment and smooth rotation ensured by the 5/8" shoulder diameter with tight tolerances for reduced vibration and part wear.
• Secure, non-slip installation with a knurled socket head and 5/16" hex drive, allowing for high torque application and easy handling.
• Reliable thread engagement with Class 3A UNC coarse threads, ensuring consistent fastening in high-vibration settings.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing 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 enhances corrosion resistance, making it suitable for applications in chemical processing, marine equipment, and food machinery where moisture and corrosive agents are present. The 1/2"-13 UNC Class 3A thread and precise shoulder dimensions provide stable pivoting and alignment in assemblies like rotating shafts, bearings, and linkages, reducing wear and maintenance needs. Its high tensile and shear strength ensures reliability in heavy-duty machinery, while the knurled socket head allows for secure tool engagement, minimizing slippage during installation in confined spaces.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit for precise UNC threading, with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" to ensure consistent performance. It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards without hazardous substances.