S-8077A486 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Superior thread engagement and reliability due to the Class 3A fit for 4-40 UNC coarse threads, minimizing the risk of cross-threading and loosening.
• Enhanced durability and wear resistance provided by the Black Oxide finish, which also offers a sleek, non-reflective appearance.
• High mechanical strength with a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi, ensuring dependable performance under heavy loads.
• Secure and easy installation with a 5/64" hex socket drive and a knurled head for improved grip and torque application.
• Precision shoulder for accurate alignment, featuring a standard fit shoulder with controlled diameter and length tolerances for consistent assembly.
• Compliance with major environmental regulations, being RoHS 3 and REACH compliant, making it suitable for global supply chains.

Professional Applications & Engineering Value

This 316 Stainless Steel Shoulder Screw is engineered to address critical challenges in precision assemblies, such as in machinery, automotive, and electronics. The Black Oxide finish not only enhances corrosion resistance but also reduces galling, a common issue in stainless steel fasteners. With its 4-40 UNC coarse thread and Class 3A fit, it ensures rapid assembly and high vibration resistance, reducing maintenance downtime. The knurled head and hex socket drive allow for secure handling in tight spaces, while the precisely machined shoulder provides stable pivoting or spacing in linkages and rotating components, improving overall system reliability and longevity in demanding industrial applications.

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 1/8" with a tolerance of -0.005" to 0.005". It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for various regulated industries.