S-8077A859 1/4"-28 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure
• Enhanced durability and wear resistance from the black oxide finish, providing added protection against abrasion and oxidation
• Precise alignment and smooth rotation due to the 2 1/2" shoulder with tight tolerances, reducing component wear and ensuring reliable performance
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength, suitable for demanding mechanical applications
• Secure, non-slip installation thanks to the knurled socket head and 5/32" hex drive, allowing for easy torque application without stripping
• Accurate and reliable fastening with Class 3A thread fit and 1/4"-28 UNF fine threads, ensuring tight seals and vibration resistance
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and environmental responsibility

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical stress. The black oxide finish enhances surface hardness and reduces friction, making it ideal for high-wear applications in machinery, automotive assemblies, and precision instruments. The 2 1/2" shoulder length provides a stable pivot or spacer, minimizing play and ensuring accurate component positioning. With 1/4"-28 UNF fine threads and Class 3A fit, it offers superior vibration resistance and leak-proof fastening in dynamic environments. Commonly used in rotating assemblies, bearing mounts, and linkage systems, this screw delivers long-term reliability and reduces maintenance needs.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". It adheres to Class 3A thread fit for high accuracy and meets ASME B18.3 manufacturing standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial uses.