S-97345A833 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh industrial and marine environments.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precision alignment and smooth rotation ensured by the 3 1/2" shoulder with tight tolerances, reducing wear on mating parts.
• Secure, high-torque installation via the 5/16" hex socket drive and knurled head, providing excellent grip and preventing tool slippage.
• Durable, wear-resistant threads with Class 3A fit and coarse 1/2"-13 UNC thread, ensuring long-lasting, vibration-resistant connections.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
• Consistent hardness and reliability with Rockwell B79 rating, maintaining dimensional stability across demanding applications.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery. The 3 1/2" shoulder length provides a precise pivot or bearing surface, minimizing misalignment and reducing wear in assemblies like rotating shafts, linkages, and precision guides. The coarse 1/2"-13 UNC thread with Class 3A fit ensures quick assembly and high resistance to loosening under vibration, common in automotive, aerospace, and heavy equipment. The knurled head and hex socket drive allow for secure tightening in confined spaces, while the corrosion-resistant 316 stainless steel material ensures longevity in corrosive environments, making it a reliable choice for OEMs and maintenance teams seeking durability and precision.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise engagement. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring high dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and global industrial applications.