S-8077A586 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in high-stress applications.
• Precision alignment and smooth rotation ensured by the Class 3A thread fit and standard shoulder fit, reducing wear and assembly time.
• Secure, non-slip installation with a knurled socket head and 3/16" hex drive, providing excellent grip and torque transmission.
• Robust durability backed by Rockwell B79 hardness, maintaining structural integrity under repetitive loads and vibration.
• Broad compatibility with 5/16"-18 UNC coarse threads and adherence to ASME B18.3 standards, ensuring interchangeability and quality.
• Environmentally compliant design meeting RoHS 3 and REACH regulations, supporting sustainable and safe manufacturing practices.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and corrosion-induced failure. The Black Oxide finish enhances surface durability and provides an additional layer of protection against moisture and chemicals, making it suitable for industrial applications like conveyor systems, automotive jigs, and robotics. Its 6 1/2" shoulder length and precise shoulder diameter tolerance allow for accurate positioning of moving parts, reducing friction and maintenance needs. Combined with the UNC thread and Class 3A fit, it ensures tight, reliable fastening in assemblies subject to high shear strength demands, thereby improving overall equipment uptime and safety.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A precision tolerance for consistent fit. The shoulder diameter (3/8") and length (6 1/2") adhere to tight tolerances, supporting accurate assembly. Manufactured in accordance with ASME B18.3 specifications, it ensures dimensional reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial use without hazardous substances.