S-8077A781 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure.
• Enhanced durability and wear resistance from the black oxide finish, which also provides a sleek, non-reflective surface.
• High-strength performance with a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi for demanding applications.
• Precise and secure fit with a Class 3A thread fit and UNC coarse thread, ensuring reliable fastening and vibration resistance.
• Easy installation and removal using a standard 5/16" hex drive and a knurled head for improved grip and tool engagement.
• Accurate alignment and bearing surface provided by the 3" shoulder length with tight tolerances, reducing wear on mating parts.
• 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 with a black oxide finish is engineered to solve critical challenges in industrial settings, such as misalignment and component wear. The 3/8"-16 UNC thread with Class 3A fit offers superior holding power in high-vibration environments, while the precisely machined shoulder acts as a pivot or axle, ensuring smooth rotation and reducing stress on assembled parts. Commonly used in machinery, automotive, and aerospace applications, its high tensile and shear strength provides reliable performance under heavy loads, making it an ideal choice for precision shoulder screw needs where durability and corrosion resistance are paramount.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC coarse threads for precise engagement, and adheres to ASME B18.3 manufacturing standards. Key dimensions include a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" for consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for industrial use.