S-90298A743 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and reducing maintenance costs.
• Enhanced assembly precision through Class 3A thread fit and standard shoulder fit, ensuring consistent alignment and reduced part wear.
• High mechanical strength with 70,000 psi tensile and 35,000 psi minimum shear strength, providing reliable performance under heavy loads.
• Secure and efficient installation via the knurled hex socket head and 1/4" hex drive, preventing tool slippage and speeding up assembly.
• Long-lasting durability from Rockwell B55 hardness, maintaining structural integrity through repeated use and vibration.
• Broad compatibility with UNC coarse threads and 7" shoulder length, fitting standard components and simplifying inventory management.
• Regulatory peace of mind by meeting ASME B18.3 standards and being RoHS 3 & REACH compliant, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This socket head shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial assemblies. The 18-8 Stainless Steel material offers excellent resistance to corrosion and oxidation, making it suitable for applications in machinery, automotive, and outdoor equipment where exposure to moisture or chemicals is common. The 7" shoulder length provides a precise pivot or bearing surface, reducing friction and wear on moving parts. With a knurled hex socket head and 1/4" hex drive, it ensures secure torque application without cam-out, enhancing worker safety and efficiency. The UNC coarse thread and Class 3A fit deliver reliable fastening in high-vibration environments, preventing loosening and maintaining assembly integrity over time. Ideal for use in pivots, axles, and guides, this fastener supports robust performance in demanding industrial fastener applications.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring high accuracy for Class 3A thread fit and standard shoulder fit. It adheres to ASME B18.3 specifications for consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial and international markets.