S-97832A143 5/16"-18 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.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for reliable, heavy-duty applications.
• Precise alignment and smooth rotation ensured by the 1/2" shoulder diameter with tight tolerances for consistent performance in assemblies.
• Quick and secure installation with a 1/4" hex drive and knurled head, providing excellent grip and reducing tool slippage.
• High thread reliability due to the 5/16"-18 UNC coarse thread with Class 3A fit, minimizing cross-threading and ensuring easy assembly.
• Long-term durability backed by Rockwell B55 hardness, resisting wear and deformation under load.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, vibration loosening, and corrosion in precision machinery. The 18-8 stainless steel material provides excellent resistance to rust and chemicals, making it suitable for applications in automotive, aerospace, and manufacturing equipment. The 1/2" shoulder diameter with controlled tolerances acts as a precise pivot or spacer, reducing wear on moving parts and ensuring smooth operation. Combined with the 5/16"-18 UNC coarse thread and Class 3A fit, it offers quick assembly and high clamping force, ideal for securing components in high-stress environments. The knurled head and hex drive enhance installation efficiency, while compliance with ASME B18.3 and environmental regulations guarantees reliability and broad usability across global industries.

Specification Summary & Compliance

This shoulder screw features precise dimensional controls, including a Class 3A thread fit for tight tolerances and a shoulder diameter tolerance of -0.004" to -0.002". It adheres to UNC coarse thread standards and is manufactured in compliance with ASME B18.3 specifications. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, ensuring it is free from hazardous substances and suitable for environmentally conscious industrial applications.