S-8077A139 2-56 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precise component alignment enabled by the 1" shoulder with controlled diameter tolerance, ensuring accurate positioning in assemblies.
• Durable, wear-resistant finish with black oxide coating that enhances surface hardness and provides mild corrosion protection.
• Secure, high-precision threading with UNC coarse 2-56 threads and Class 3A fit for easy assembly and vibration resistance.
• Easy installation and removal using a standard 5/64" hex key, complemented by a knurled head for improved grip during manual handling.
• Compliance with global standards including RoHS 3 and REACH, ensuring safety and environmental responsibility for international supply chains.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. The black oxide finish on the socket head shoulder screw not only enhances its aesthetic appeal but also adds a layer of protection against corrosion and wear, making it suitable for applications in marine, chemical processing, and outdoor environments. The UNC coarse threading and Class 3A thread fit ensure quick, reliable fastening with high resistance to loosening under dynamic loads. The precisely machined 1" shoulder provides a stable bearing surface for rotating parts like gears, pulleys, and linkages, reducing misalignment and wear in assemblies. Its high tensile and shear strength guarantees durability in demanding applications, from automotive systems to electronic enclosures, where corrosion resistance and long-term reliability are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a 2-56 thread size and Class 3A thread fit for precise, secure fastening. Key dimensional tolerances include a shoulder diameter of 3/32" (tolerance: -0.004" to -0.002") and shoulder length of 1" (tolerance: -0.005" to 0.005"), ensuring consistent performance in precision applications. Manufactured from 316 stainless steel with a black oxide finish, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting use in regulated industries without hazardous substances.