S-8077A759 1/2"-13 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.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for demanding, high-load applications.
• Precise alignment and smooth rotation ensured by the accurately machined shoulder with tight diameter and length tolerances.
• Secure, non-slip installation provided by the knurled head and 5/16" hex drive, allowing for high torque application.
• Reliable thread engagement with Class 3A fit and coarse UNC threads for faster assembly and reduced cross-threading risk.
• Enhanced durability and wear resistance from the black oxide finish, which also provides a sleek, professional appearance.
• Full compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory acceptance.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to solve critical alignment and pivot point challenges in machinery and equipment. The precision-machined shoulder acts as a built-in spacer or bearing surface, eliminating the need for additional components and reducing assembly time. Its high tensile strength and Rockwell B79 hardness make it suitable for heavy-duty applications such as conveyor systems, robotic arms, and automotive jigs, where repetitive motion and high stress are common. The black oxide finish not only enhances corrosion resistance but also minimizes galling in moving parts. With a Class 3A thread fit and 1/2"-13 UNC coarse thread, it ensures quick, secure fastening in industrial assemblies, providing long-term reliability and reducing maintenance downtime.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with 1/2"-13 UNC coarse threads and a shoulder diameter tolerance of -0.004" to -0.002". It is manufactured in compliance with ASME B18.3 specifications and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets stringent environmental and safety standards for industrial use.