S-97832A147 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 environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for demanding, high-load applications.
• Precise alignment and positioning ensured by the 1/2" diameter shoulder with tight tolerances, reducing component wear and misalignment.
• Reliable, vibration-resistant assembly through Class 3A thread fit and coarse UNC threads, providing secure fastening in dynamic conditions.
• Easy installation and removal with a 1/4" hex socket drive and knurled head, allowing for efficient tool engagement and manual handling.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.
• Enhanced durability from Rockwell B55 hardness, maintaining structural integrity under repeated stress and mechanical forces.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The 1/2" shoulder diameter provides a stable bearing surface that prevents axial movement and maintains precise component spacing, reducing wear on moving parts. Its 5/16"-18 UNC coarse threads and Class 3A thread fit ensure quick assembly and high resistance to loosening under vibration, making it ideal for applications in robotics, conveyor systems, and manufacturing jigs. The knurled head and socket drive facilitate easy installation in confined spaces, while the stainless steel material offers excellent corrosion resistance for use in humid or chemically aggressive environments. This screw delivers reliable performance, minimizing downtime and maintenance costs in high-strength industrial applications.

Specification Summary & Compliance

This shoulder screw features precise dimensional tolerances, including a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". The threads conform to UNC standards with a Class 3A fit, ensuring high accuracy and interchangeability. Manufactured in accordance with ASME B18.3 specifications, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing adherence to environmental and safety standards for industrial use.