S-8077A487 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life.
• Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance under high stress.
• Precise alignment and spacing enabled by the 3/4" shoulder with tight tolerances, reducing assembly errors and improving component fit.
• Secure, non-slip fastening thanks to the knurled head and hex socket drive, allowing for high torque application and easy installation.
• Durable, wear-resistant surface from the black oxide finish, which also provides a sleek appearance and added corrosion protection.
• High-accuracy threading with Class 3A fit and UNC coarse thread for quick assembly and strong holding power in various materials.
• Compliance with global standards including RoHS 3 and REACH, ensuring safety and environmental responsibility for international projects.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical challenges in precision assembly and machinery. The 316 stainless steel material offers excellent resistance to corrosion and chemicals, making it suitable for marine, chemical processing, and food industry applications where moisture and corrosive agents are present. The black oxide finish enhances durability and provides a low-glare surface, while the knurled head and hex socket drive ensure a firm grip and efficient torque transfer during installation, reducing the risk of stripping. The 3/4" shoulder length with precise tolerances allows for accurate positioning of components like gears, pulleys, and bearings, minimizing misalignment and vibration. With a Class 3A thread fit and coarse thread design, it enables rapid assembly and disassembly, saving time in maintenance and production lines. Ideal for robotics, automotive, and aerospace sectors, this screw delivers reliability and longevity in demanding environments.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision. Key dimensional tolerances include a shoulder diameter of 1/8" with a tolerance of -0.004" to -0.002" and a shoulder length of 3/4" with a tolerance of -0.005" to 0.005". It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for regulated industries.