S-97345A682 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction for extended service life in harsh environments
• Precision alignment and bearing surface provided by the 1-1/2" shoulder with tight diameter tolerance for reliable component positioning
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Secure installation and removal through hex socket drive with knurled head for improved grip during assembly
• Consistent thread engagement with Class 3A fit UNC coarse threads ensuring reliable fastening in industrial assemblies
• Environmental compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Industry-standard reliability certified to ASME B18.3 specifications for quality assurance in critical applications

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw delivers exceptional engineering value in precision assembly applications where alignment, corrosion resistance, and mechanical strength are critical. The 1-1/2" shoulder length with tight diameter tolerance provides an accurate bearing surface for rotating components, while the 5/16"-18 UNC coarse thread with Class 3A fit ensures secure fastening in machinery, automation systems, and industrial equipment. The hex socket drive with knurled head facilitates installation in confined spaces, and the material's inherent corrosion resistance makes it ideal for marine, chemical processing, and outdoor applications. These shoulder screws solve alignment challenges in pivot points, linkages, and bearing assemblies while maintaining structural integrity under substantial mechanical loads.

Specification Summary & Compliance

This precision shoulder screw features a 5/16"-18 UNC thread with Class 3A fit, 1-1/2" shoulder length with ±0.005" tolerance, and 1/2" shoulder diameter with -0.004" to -0.002" tolerance. Manufactured to ASME B18.3 specifications, it delivers consistent dimensional accuracy and performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors while meeting rigorous quality standards for precision mechanical applications.