S-8077A484 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 offering 70,000 psi tensile and 35,000 psi shear strength for high-stress applications.
• Precise and secure assembly ensured by the Class 3A thread fit, minimizing backlash and improving joint reliability.
• Enhanced wear resistance and reduced light reflection from the Black Oxide finish, providing added durability and a professional appearance.
• Easy installation and removal with the knurled socket head and 5/64" hex drive, allowing for high torque application without slippage.
• Accurate component alignment due to the consistent 1/2" shoulder length with tight tolerances, ensuring precise positioning in assemblies.
• Compliance with stringent environmental regulations including RoHS 3 and REACH, making it suitable for global markets and sensitive applications.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address common industrial challenges such as component misalignment, corrosion-induced failure, and assembly inefficiency. The UNC coarse thread and Class 3A fit provide a robust, vibration-resistant connection, crucial for machinery, automotive, and electronics where reliability is paramount. The Black Oxide finish on the socket head not only enhances corrosion resistance but also reduces galling during installation. The precise shoulder diameter and length with minimal tolerances ensure accurate pivoting and spacing in linkages, bearings, and rotating assemblies, reducing wear and maintenance needs. Its high tensile and shear strength makes it a dependable choice for demanding industrial applications, offering long-term performance and cost savings.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A fit for precise thread engagement. Dimensions include a 4-40 thread size, 5/32" thread length, 1/2" shoulder length, and 1/8" shoulder diameter, all manufactured to tight tolerances (e.g., shoulder diameter tolerance of -0.004" to -0.002"). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for various industrial and export requirements.