S-8077A277 7/8"-9 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments including marine and chemical processing applications.
• Enhanced durability and wear resistance from the black oxide finish, which provides an added layer of protection against rust and reduces galling.
• High load-bearing capacity with a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi, ensuring reliable performance under heavy stress.
• Precise assembly and alignment due to the Class 3A thread fit and standard shoulder fit, minimizing play and improving component positioning.
• Secure and easy installation with a 5/8" hex drive and knurled head, offering excellent grip and torque transmission while reducing tool slippage.
• Long-lasting performance supported by Rockwell B79 hardness, maintaining structural integrity and thread sharpness over repeated use.
• Broad industry compliance meeting ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility in global supply chains.

Professional Applications & Engineering Value

This 7/8"-9 UNC shoulder screw is engineered to address critical challenges in precision machinery and heavy-duty industrial assemblies. Made from 316 stainless steel, it offers exceptional resistance to corrosion and oxidation, making it suitable for demanding environments like marine equipment, chemical processing plants, and food manufacturing. The black oxide finish not only enhances durability but also reduces friction during installation, preventing seizing and thread damage. With a Class 3A thread fit and precise shoulder dimensions, this screw ensures accurate alignment and minimal vibration in applications such as rotating shafts, pivoting mechanisms, and conveyor systems. Its high tensile and shear strength provides reliable fastening under dynamic loads, reducing maintenance downtime and improving operational efficiency in B2B industrial settings.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC coarse threading for secure engagement, and adheres to ASME B18.3 manufacturing standards for dimensional accuracy. Shoulder diameter and length tolerances are tightly controlled (e.g., shoulder diameter: -0.004" to -0.002") to ensure consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental suitability for global industrial use.