S-8077A337 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 outdoor applications
• Enhanced durability and wear resistance from the black oxide finish, providing long-lasting performance and reduced maintenance
• Precise alignment and secure mounting ensured by the Class 3A thread fit, minimizing vibration loosening in critical assemblies
• High-strength performance with 70,000 psi tensile and 35,000 psi shear strength, reliably handling heavy loads and mechanical stress
• Easy installation and removal with the hex socket drive and knurled head, allowing for efficient tool engagement in tight spaces
• Accurate component positioning thanks to the 1-1/4" shoulder length with tight tolerances, reducing assembly errors and improving product quality
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory acceptance for global supply chains

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw with black oxide finish is engineered to address common industrial challenges such as corrosion, misalignment, and mechanical failure. The UNC coarse threads and Class 3A thread fit provide reliable fastening in high-vibration environments, preventing loosening in machinery, automotive, and aerospace assemblies. The 1-1/4" shoulder length with precise tolerances ensures accurate pivot points and bearing surfaces in rotating equipment, reducing wear and extending service life. Its 70,000 psi tensile strength and 35,000 psi shear strength make it suitable for heavy-duty applications, while the hex socket drive and knurled head facilitate quick maintenance. Ideal for use in pumps, conveyors, and precision instruments, this shoulder screw delivers consistent performance where durability and precision are critical.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for high precision, and a shoulder diameter of 1/2" with tight tolerances (-0.004" to -0.002"). It complies with ASME B18.3 manufacturing standards and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for industrial and export applications.