S-8077A573 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 chemical exposure.
• Enhanced durability and wear resistance from the Black Oxide finish, which also reduces light reflection and provides a sleek appearance.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under heavy loads.
• Precise alignment and smooth rotation ensured by the 5" shoulder with tight diameter and length tolerances for consistent assembly.
• Secure, non-slip fastening with a knurled socket head and hex drive, allowing for high torque application without tool slippage.
• Easy installation and removal thanks to the coarse 5/16"-18 UNC threads and Class 3A fit, providing excellent engagement and vibration resistance.
• 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 is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The black oxide finish not only enhances corrosion resistance but also minimizes galling in high-friction applications. With a 5-inch shoulder length and tight tolerances, it provides exact pivot points and bearing surfaces, reducing wear in rotating assemblies. The coarse UNC threads and Class 3A fit ensure quick assembly and reliable holding power, even in vibrating environments. Ideal for use in conveyor systems, robotics, and industrial molds, this screw delivers long-term reliability and reduces maintenance downtime, making it a cost-effective solution for demanding industrial applications.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a Class 3A thread fit for superior engagement and a shoulder diameter tolerance of -0.004" to -0.002". It adheres to ASME B18.3 specifications for consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it meets strict environmental and safety standards for global industrial use.