S-97768A372 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
• Superior load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance in heavy-duty applications.
• Precise thread engagement with Class 3A thread fit and UNC coarse threads, ensuring secure fastening and vibration resistance.
• Easy installation and removal thanks to the hex socket drive and knurled head, providing excellent grip and torque transmission.
• Accurate component alignment with a consistent shoulder diameter and length, minimizing assembly errors and improving machinery reliability.
• Long-term durability with Rockwell B55 hardness, maintaining structural integrity under repeated stress and wear.
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy equipment assemblies. The 18-8 stainless steel material combined with a black oxide finish provides excellent resistance to corrosion and oxidation, extending service life in demanding conditions like manufacturing plants or outdoor applications. The UNC coarse thread and Class 3A thread fit ensure tight, reliable connections that resist loosening under vibration, reducing maintenance downtime. With a robust socket head and knurled texture, it allows for efficient installation using standard hex tools, speeding up assembly processes while maintaining alignment accuracy through its precisely machined shoulder. Ideal for use in pivots, spacers, and rotating components, this fastener enhances operational reliability and reduces the risk of component failure.

Specification Summary & Compliance

This shoulder screw features precise dimensional tolerances, including a Class 3A thread fit for high accuracy and a shoulder diameter tolerance of -0.004" to -0.002". It adheres to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets industry standards for performance and environmental safety.