S-8077A678 1/4"-28 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh chemical or marine environments.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for high-load applications.
• Precise, secure assembly ensured by the Class 3A thread fit and UNF fine threading, reducing the risk of loosening under vibration.
• Enhanced durability and wear resistance from the Black Oxide finish, which also provides a sleek, non-reflective appearance.
• Easy installation and removal with the hex socket drive and knurled head for improved grip during tooling.
• Accurate alignment and spacing due to the consistent 3/8" shoulder diameter and length, critical for precision machinery.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and reliability.

Professional Applications & Engineering Value

This 316 Stainless Steel Shoulder Screw is engineered to address critical challenges in industrial settings, such as misalignment and component wear. Its Black Oxide finish not only enhances corrosion resistance but also minimizes galling in high-friction applications. The UNF fine thread and Class 3A fit provide tight tolerances, essential for maintaining precision in assemblies subject to vibration, like robotics, automotive systems, and conveyor equipment. The knurled head and hex drive facilitate quick, secure fastening, reducing assembly time and improving workflow efficiency in manufacturing and maintenance operations.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit for high precision, with a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002") and shoulder length of 3/8" (tolerance: -0.005" to 0.005"). It conforms to ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.