S-97832A142 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 reducing maintenance costs.
• Exceptional load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable performance in high-stress applications.
• Precise alignment and secure positioning thanks to the 1/2" shoulder diameter with tight tolerances, minimizing component wobble and assembly errors.
• Easy installation and removal with a knurled socket head and 1/4" hex drive, providing a firm grip and reducing tool slippage.
• Consistent thread engagement with Class 3A UNC coarse threads, offering superior vibration resistance and faster assembly in industrial settings.
• Enhanced durability with Rockwell B55 hardness, resisting wear and deformation over extended use cycles.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and strength challenges in precision machinery. The 18-8 stainless steel material provides excellent corrosion resistance, making it suitable for applications in moist or chemically aggressive environments, such as food processing, marine equipment, and outdoor machinery. The 1/2" shoulder diameter with controlled tolerances ensures accurate component spacing and rotational stability, reducing wear on moving parts. Combined with Class 3A UNC coarse threads, it offers reliable fastening in high-vibration settings like automotive assemblies, robotics, and conveyor systems. The knurled socket head enhances grip during installation, speeding up assembly while maintaining torque integrity. Ideal for industrial shoulder bolt applications, this screw delivers long-term reliability and reduces downtime in demanding operations.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and superior engagement. The shoulder diameter is manufactured to a tolerance of -0.004" to -0.002", and the shoulder length to -0.005" to 0.005", ensuring consistent performance. It conforms to ASME B18.3 specifications for socket head shoulder screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing it is free from hazardous substances and safe for various industrial and international markets.