S-8077A821 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh industrial and marine environments.
• Enhanced durability and wear resistance from the black oxide finish, which also reduces light reflection and provides a sleek appearance.
• Precise alignment and smooth rotation thanks to the standard shoulder fit and knurled head for secure grip during installation.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliability in heavy-duty applications.
• Accurate and secure fastening with Class 3A thread fit and UNC coarse thread for quick assembly and reduced cross-threading risk.
• Easy installation and removal using a standard 5/32" hex drive socket head, compatible with common tools.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address common industrial challenges, such as component misalignment and corrosion-induced failure. The black oxide finish not only enhances corrosion resistance but also minimizes friction in moving parts, making it ideal for machinery, automotive assemblies, and precision equipment. With a Class 3A thread fit and UNC coarse thread, it ensures quick, reliable fastening in high-vibration environments, reducing maintenance downtime. The knurled head provides a non-slip surface for secure handling, while the robust shoulder design supports rotational or linear motion applications, delivering long-term performance in demanding settings like aerospace, manufacturing, and marine systems.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter of 5/16" (tolerance: -0.004" to -0.002") and shoulder length of 2 3/4" (tolerance: -0.005" to 0.005"), with a Class 3A thread fit for high accuracy. It adheres to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it meets strict environmental and safety regulations for industrial use.