S-8077A622 5/16"-18 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 extended service life.
• Enhanced durability and wear resistance from the black oxide finish, providing a protective layer against abrasion and galling.
• High-strength performance with a tensile strength of 70,000 psi and shear strength of 35,000 psi for reliable load-bearing in demanding applications.
• Precise and secure fastening ensured by Class 3A thread fit and UNC coarse threads, reducing the risk of cross-threading and ensuring consistent engagement.
• Easy installation and removal with a hex socket drive and knurled head, offering superior grip and torque application without slippage.
• Accurate alignment and spacing provided by the machined shoulder, which acts as a precision pivot or bearing surface.
• Compliance with industry standards including ASME B18.3, ensuring interchangeability, reliability, and quality in mechanical assemblies.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment, corrosion, and mechanical stress. The black oxide finish not only enhances corrosion resistance but also reduces friction, making it ideal for moving parts in machinery, automation systems, and precision instruments. The 5/16"-18 UNC coarse threads and Class 3A thread fit provide robust, vibration-resistant connections, minimizing loosening in high-stress environments. With a 70,000 psi tensile strength and precisely machined shoulder, it serves as a reliable pivot point in linkages, bearings, and cam followers, ensuring smooth operation and extended equipment lifespan. Its compliance with ASME B18.3 guarantees consistency and reliability for B2B procurement in sectors like aerospace, automotive, and heavy machinery.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A precision tolerance for secure fastening. The shoulder diameter is 3/8" with a tight tolerance of -0.004" to -0.002", and the shoulder length is 7/16" with a tolerance of -0.005" to 0.005" for accurate fit. Manufactured to ASME B18.3 specifications, it ensures dimensional consistency and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible and safe industrial use.