S-8077A788 3/8"-16 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 outdoor applications.
• Enhanced durability and wear resistance from the Black Oxide finish, which also reduces light reflection and provides a sleek appearance.
• Precise alignment and secure positioning thanks to the knurled head and standard shoulder fit, minimizing component movement.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliability in high-stress assemblies.
• Easy installation and removal using a standard 5/16" hex drive, providing a secure grip and reducing tool slippage.
• Accurate thread engagement with Class 3A thread fit and UNC coarse threads, offering excellent vibration resistance and quick assembly.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw in 316 Stainless Steel with a Black Oxide finish is engineered to solve critical challenges in machinery, automation, and precision equipment. The knurled head enhances grip during manual adjustments, while the standard shoulder diameter provides a precise pivot or bearing surface, reducing wear on connected parts. Its Class 3A thread fit and coarse thread spacing ensure reliable performance in high-vibration environments, such as robotics, conveyor systems, and automotive assemblies. The combination of high tensile strength and corrosion resistance makes it ideal for applications exposed to moisture, chemicals, or extreme temperatures, delivering long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC coarse threads, ensuring tight tolerances for secure fastening. Dimensions include a 5/8" shoulder diameter with a tolerance of -0.004" to -0.002", and a 3/8" shoulder length with a tolerance of -0.005" to 0.005" for precise engineering applications. It is manufactured to meet ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and adherence to global standards.