S-90298A216 8-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments.
• Precise component alignment enabled by the 1" shoulder length with tight tolerances, reducing assembly errors and improving machine reliability.
• High-strength fastening with 70,000 psi tensile strength and Rockwell B55 hardness, ensuring dependable load-bearing in demanding applications.
• Secure, high-precision threading thanks to the Class 3A fit 8-32 UNC coarse thread, providing excellent vibration resistance and consistent clamping force.
• Easy installation and removal with a standard hex socket head and 3/32" drive, allowing for efficient maintenance with common tools.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and safety for global industrial use.
• Optimized for automated assembly with consistent right-hand coarse threading and smooth head texture, facilitating high-speed production lines.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in precision machinery. The 1" shoulder length with minimal diameter and length tolerances ensures exact positioning of moving parts, such as in linkages, gears, and pivots, reducing wear and preventing misalignment. The Class 3A UNC coarse thread and passivated finish provide superior corrosion and vibration resistance, making it ideal for industrial automation, automotive assemblies, and electronic enclosures. With a socket head design for secure tool engagement, it streamlines maintenance in confined spaces, enhancing operational efficiency and equipment lifespan.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high precision. The shoulder diameter tolerance is -0.001" to 0.001", and shoulder length tolerance is -0.005" to 0.005", ensuring consistent dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental and safety standards for industrial use.