S-90298A821 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and reducing maintenance costs
• Superior load-bearing capacity with 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance in demanding applications
• Precise alignment and smooth rotation ensured by the 6 1/2" shoulder with tight diameter tolerance, minimizing wear on mating components
• Secure, non-slip fastening provided by the knurled socket head and 5/16" hex drive, allowing for high torque application without tool slippage
• Consistent, reliable thread engagement with Class 3A fit and 1/2"-13 UNC coarse threads, ensuring vibration resistance and easy assembly
• Enhanced durability and hardness at Rockwell B55, offering excellent resistance to deformation under heavy loads
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety for global supply chains

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery, automation systems, and precision equipment. The 18-8 Stainless Steel material provides excellent corrosion resistance, extending service life in moist or chemically aggressive environments. Its 6 1/2" shoulder length with precise tolerances acts as a reliable pivot or axle, reducing friction and wear in rotating assemblies. The Class 3A thread fit and coarse UNC threads ensure secure fastening even under vibration, while the knurled socket head allows for efficient installation in tight spaces. Ideal for applications requiring high tensile strength and dimensional stability, this component minimizes downtime and maintenance in B2B manufacturing settings.

Specification Summary & Compliance

This shoulder screw adheres to inch system measurements with a Class 3A thread fit for high precision. It meets ASME B18.3 specifications, ensuring dimensional accuracy and manufacturing consistency. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", providing reliable performance in assembly. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, it is free from hazardous substances, supporting safe and sustainable industrial use.