S-8077A521 3-48 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 and reliability with 70,000 psi tensile and 35,000 psi shear strength, ensuring secure fastening under demanding loads.
• Precise alignment and smooth rotation provided by the standard shoulder fit and Class 3A thread, reducing wear and simplifying assembly.
• Secure, non-slip installation enabled by the knurled socket head and 5/64" hex drive, allowing for high torque application without stripping.
• Broad industrial compliance meeting RoHS 3 and REACH standards, making it suitable for regulated and environmentally conscious applications.
• Coarse UNC thread design for faster assembly and reduced cross-threading risk in right-hand thread applications.
• Durable, wear-resistant performance supported by Rockwell B79 hardness, maintaining integrity through repeated use.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw with a black oxide finish is engineered to address common industrial challenges such as corrosion, misalignment, and mechanical stress. The shoulder screw design provides a precise bearing surface that supports rotating components, minimizing friction and wear in machinery, pivots, and linkages. The Class 3A thread fit and UNC coarse thread ensure tight, reliable fastening, while the socket head with knurling allows for secure tool engagement in confined spaces. Ideal for applications in automotive, marine, and chemical processing industries, this screw delivers corrosion resistance and high tensile strength, reducing maintenance and downtime in demanding environments.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision and tight tolerances. Key dimensional specifications include a shoulder diameter of 1/8" with a tolerance of -0.004" to -0.002", and a shoulder length of 5/16" with a tolerance of -0.005" to 0.005". The product is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.