S-8077A399 10-32 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, which also reduces light reflection and provides a sleek appearance.
• Precise alignment and smooth rotation ensured by the 1/4" shoulder diameter with tight tolerances, minimizing component wear.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding mechanical applications.
• Secure, non-slip fastening thanks to the knurled socket head and hex drive, allowing for high torque application without stripping.
• Fine thread accuracy with 10-32 UNF Class 3A thread fit, providing reliable, vibration-resistant connections in precision assemblies.
• Compliance with industry standards including ASME B18.3, RoHS, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment and corrosion-induced failure. The black oxide finish not only enhances corrosion resistance but also reduces galling, making it suitable for machinery, automotive, and marine applications. Its 10-32 UNF fine thread and Class 3A fit ensure tight, reliable fastening in high-vibration environments, while the knurled socket head with hex drive allows for easy installation in confined spaces. The precise shoulder diameter and length provide stable bearing surfaces, reducing wear on connected components and extending equipment lifespan in precision engineering and assembly lines.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high precision and a shoulder diameter tolerance of -0.004" to -0.002". It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. The UNF fine thread and standard shoulder fit guarantee consistent performance in industrial applications, backed by a hardness of Rockwell B79 and tensile strength of 70,000 psi.