S-90298A883 3/4"-10 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh industrial environments.
• Exceptional precision and load-bearing stability from the 4" shoulder with tight ±0.005" length tolerance and ±0.001" diameter tolerance, minimizing misalignment.
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
• Secure, non-slip fastening enabled by the knurled head and 1/2" hex drive, allowing for high-torque installation without tool slippage.
• Reliable thread engagement with Class 3A fit and 3/4"-10 UNC coarse threads, providing consistent clamping force and vibration resistance.
• Broad industry compliance meeting ASME B18.3 specifications and environmental standards like RoHS 3 and REACH for safe, global use.
• Versatile right-hand threading designed for standard assembly processes, ensuring compatibility with common UNC components.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 stainless steel material, combined with a passivated finish, resists oxidation and chemical exposure, making it ideal for machinery, automotive, and electronics sectors where environmental factors are a concern. The 4" shoulder length with minimal tolerances acts as a precise pivot or spacer, reducing wear on moving parts and maintaining component positioning under load. Its UNC coarse threads and Class 3A fit ensure quick, secure fastening in high-vibration settings, while the knurled head and 1/2" hex drive facilitate easy installation in confined spaces. By integrating these features, the screw enhances equipment longevity and reduces maintenance needs in industrial shoulder bolt applications.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 standards, with precise dimensions including a Class 3A thread fit for superior engagement and a shoulder diameter tolerance of -0.001" to 0.001". The UNC coarse threading and right-hand direction comply with industry norms, while the manufacturing process ensures consistency in thread spacing and length. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material sustainability.