S-8077A472 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh chemical and marine environments
• Enhanced durability and wear resistance from the black oxide finish, reducing maintenance frequency
• Precise alignment and reduced part wear thanks to the Class 3A thread fit and standard shoulder fit
• High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
• Secure, non-slip installation enabled by the knurled head and 5/64" hex drive for reliable torque transmission
• Broad industrial compliance meeting RoHS 3 and REACH regulations, ensuring safety and environmental standards
• Versatile coarse UNC threading for faster assembly and reduced cross-threading risks in high-vibration settings

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw with a black oxide finish is engineered to address critical challenges in machinery, automation, and outdoor equipment where corrosion resistance and precision alignment are paramount. The Class 3A thread fit and standard shoulder diameter ensure minimal backlash and consistent positioning in assemblies, reducing wear on mating components. Its high tensile strength supports heavy loads, while the coarse UNC 4-40 thread facilitates quick installation in industrial applications like pivots, guides, and rotating mechanisms. The knurled socket head enhances grip during tightening, making it a reliable choice for maintenance-intensive environments.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise tolerance. Dimensions include a 0.25" head diameter, 5/32" thread length, and shoulder diameter tolerance of -0.004" to -0.002". It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.