S-90318A103 2-56 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel and passivated finish, ideal for harsh environments and extended service life.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under heavy loads.
• Precise shoulder fit with controlled diameter and length tolerances ensuring accurate alignment and reduced assembly vibration.
• Easy installation and removal using a standard 1/16" hex drive socket head, providing secure torque application in confined spaces.
• Consistent thread engagement with UNC coarse threads and Class 2A fit, facilitating quick assembly and reducing cross-threading risks.
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global markets.
• Durable material hardness at Rockwell B70, maintaining structural integrity and resistance to wear over time.

Professional Applications & Engineering Value

This 2-56 UNC shoulder screw in 316 stainless steel with a socket head design addresses critical engineering needs in precision assemblies. The passivated finish enhances corrosion resistance, making it suitable for applications in marine, chemical, and medical equipment where moisture and chemicals are prevalent. The precise shoulder fit with tight tolerances on diameter and length ensures accurate component positioning, reducing misalignment and improving overall machine reliability. Commonly used in robotics, aerospace, and automotive systems, these screws provide a secure fastening solution that withstands high stress and vibration, thanks to their coarse thread spacing and right-hand thread direction. By integrating robust materials and compliant standards, this shoulder screw delivers long-term durability and performance in demanding industrial environments.

Specification Summary & Compliance

This product adheres to Class 2A thread fit and UNC thread standards, ensuring dimensional accuracy and interchangeability. The shoulder features precise tolerances: diameter of 3/32" (-0.001" to 0") and length of 3/8" (0" to 0.002"). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its environmental safety and suitability for restricted substance-free applications.