S-8077A476 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Enhanced durability and wear resistance from the Black Oxide finish, providing a protective layer against abrasion and galling.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable load-bearing in demanding applications.
• Precise assembly and alignment enabled by the Class 3A thread fit and standard shoulder, offering consistent and secure fastening.
• Secure, non-slip installation with the knurled socket head and 5/64" hex drive, allowing for high-torque application without tool slippage.
• Versatile coarse UNC threading (4-40) for quick engagement and robust holding power in various materials.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use in regulated industries.

Professional Applications & Engineering Value

This 316 Stainless Steel Shoulder Screw with a Black Oxide finish is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty industrial equipment. The 4-40 UNC coarse thread and Class 3A fit ensure minimal backlash and precise component alignment, reducing wear and maintenance downtime. The 1-1/4" shoulder length provides a stable pivot or spacer, essential for rotating assemblies and linkages. With high tensile and shear strength, it withstands dynamic loads and vibrations, making it ideal for applications in robotics, aerospace, and manufacturing where reliability and corrosion resistance are paramount. The knurled socket head enhances grip during installation, preventing stripping and ensuring consistent torque transmission.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A precision fit for tight tolerances. Key dimensions include a thread size of 4-40, shoulder diameter of 1/8" (tolerance: -0.004" to -0.002"), and shoulder length of 1-1/4" (tolerance: -0.005" to 0.005"). It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and regulatory adherence for industrial use.