S-8077A342 5/16"-18 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.
• Exceptional mechanical strength offering a 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precise alignment and smooth rotation enabled by the 1/2" shoulder diameter and 3/4" shoulder length, reducing wear on mating components.
• Secure, non-slip installation with a knurled socket head and 1/4" hex drive, ensuring firm tool grip and preventing stripping.
• High-precision Class 3A thread fit for secure fastening and vibration resistance in demanding assemblies.
• Enhanced durability and minimal galling from the black oxide finish, providing added surface protection and a sleek appearance.
• Compliance with major 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 precision machinery, automation systems, and heavy-duty industrial equipment. The 5/16"-18 UNC coarse thread and Class 3A fit ensure rapid assembly and superior vibration resistance, minimizing loosening in high-cycle applications. The black oxide finish enhances corrosion resistance, while the knurled socket head with a hex drive allows for secure torque application, reducing the risk of cam-out. With a robust shoulder diameter of 1/2" and length of 3/4", it provides exact pivot points and bearing surfaces, crucial for aligning components in conveyor systems, robotic arms, and fixturing devices, thereby extending equipment life and reducing maintenance costs.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise dimensional accuracy. The shoulder diameter tolerance is maintained between -0.004" to -0.002", and the shoulder length tolerance ranges from -0.005" to 0.005", ensuring consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and safe industrial use.