S-97768A421 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and black oxide finish, ideal for harsh industrial environments.
• Exceptional load-bearing capacity from 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications.
• Precise alignment and reduced wear due to the 1/2" shoulder diameter with tight tolerances, ensuring stable component positioning.
• Reliable fastening performance with Class 3A thread fit and coarse UNC threads, providing secure, vibration-resistant connections.
• Easy installation and removal using the hex drive and knurled head, allowing for efficient assembly with standard tools.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
• Durability under stress backed by Rockwell B55 hardness, maintaining integrity in high-torque and repetitive use scenarios.

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw is engineered to address common industrial challenges such as misalignment, component wear, and fastener failure. The 18-8 stainless steel construction, combined with a black oxide finish, provides excellent corrosion resistance, extending service life in moist or chemically aggressive settings. The precision 1/2" shoulder diameter with minimal tolerances ensures accurate alignment in machinery, reducing stress on adjacent parts and preventing premature wear. With a Class 3A thread fit and coarse thread design, it offers quick assembly and high resistance to loosening under vibration, making it ideal for industrial applications like robotics, automotive assemblies, and heavy equipment. The socket head with hex drive and knurled texture facilitates easy handling, even in confined spaces, enhancing productivity and reducing installation time.

Specification Summary & Compliance

This shoulder screw features a 3/8"-16 UNC thread with Class 3A fit for precise engagement, and a shoulder diameter of 1/2" with tolerances from -0.004" to -0.002". Thread length is 5/8", and shoulder length is 3/4" with tolerances of -0.005" to 0.005". It complies with ASME B18.3 specifications for dimensional accuracy and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations for industrial use.