S-8077A774 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 including marine and chemical applications.
• Enhanced durability and wear resistance from the black oxide finish, which provides added protection against rust and reduces galling during installation.
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable performance under heavy mechanical stress.
• Precise alignment and smooth rotation due to the 5/8" shoulder diameter with tight tolerances, minimizing component wear in assemblies.
• Secure and easy installation with a knurled socket head and 5/16" hex drive, offering improved grip and reducing tool slippage.
• Consistent thread engagement from Class 3A UNC coarse threads, providing reliable fastening in high-vibration applications.
• Compliance with industry 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 critical challenges in industrial settings, such as corrosion and mechanical failure. The black oxide finish enhances surface hardness and reduces friction, making it suitable for precision machinery, automotive assemblies, and heavy-duty equipment where high tensile strength and corrosion resistance are paramount. The 1/2"-13 UNC coarse thread and Class 3A fit ensure quick, secure fastening in high-vibration environments, while the knurled socket head allows for efficient torque application without stripping. Ideal for applications requiring exact shoulder alignment, such as in pivots, rotating shafts, and conveyor systems, this screw delivers long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This shoulder screw features precise dimensional tolerances, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring consistent performance. It adheres to ASME B18.3 specifications for dimensional accuracy and Class 3A thread fit for superior thread engagement. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial applications without hazardous substances.