S-8077A471 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh environments and extended service life.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in demanding applications.
• Precise Class 3A thread fit ensures tight, secure fastening with UNC coarse threading for easier assembly and reduced cross-threading risk.
• Enhanced grip and torque application from the knurled socket head and 5/64" hex drive, preventing tool slippage during installation.
• Accurate component alignment with a standard-fit shoulder, providing a stable pivot or bearing surface in mechanical assemblies.
• Compliance with environmental regulations, being RoHS 3 and REACH compliant for use in regulated industries.
• Durable and wear-resistant with a Rockwell B79 hardness, maintaining integrity under repetitive use and stress.

Professional Applications & Engineering Value

This 316 Stainless Steel Shoulder Screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical failure. The Black Oxide finish enhances corrosion resistance, making it suitable for applications exposed to moisture, chemicals, or outdoor conditions. The UNC coarse thread and Class 3A fit provide secure, vibration-resistant fastening, reducing the risk of loosening in dynamic systems like machinery, automotive components, and precision instruments. The knurled socket head with a hex drive allows for high-torque installation without stripping, while the precisely machined shoulder ensures accurate alignment in assemblies involving gears, linkages, or rotating parts. This combination of high tensile strength and environmental compliance delivers long-term reliability, minimizing downtime and maintenance costs in demanding industrial settings.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise tolerance. Key dimensional specifications include a thread size of 4-40, shoulder diameter of 1/8" (tolerance: -0.004" to -0.002"), and shoulder length of 7/32" (tolerance: -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 of restricted substances for use in various industrial and mechanical applications.