S-8077A751 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 environments and extended service life.
• Enhanced wear protection and reduced light reflection from the black oxide finish, improving durability and usability.
• Precise alignment and secure pivoting enabled by the 4 1/2" shoulder with tight diameter tolerance for reliable assembly.
• High-strength performance under load with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications.
• Secure, non-slip installation thanks to the knurled hex socket head and 5/16" drive, preventing tool slippage.
• Accurate and durable threading with Class 3A UNC coarse threads, ensuring consistent fit and high fatigue resistance.
• Compliance with industry standards including ASME B18.3, RoHS, and REACH, guaranteeing quality and environmental safety.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to solve critical challenges in industrial machinery, automation, and precision equipment. The black oxide finish on the corrosion-resistant 316 material provides an extra layer of defense against moisture, chemicals, and wear, significantly reducing maintenance needs in harsh operational environments. The 1/2"-13 UNC Class 3A thread and precisely machined shoulder ensure exact alignment and smooth rotational movement, preventing misalignment and reducing component stress. Commonly used in pivoting mechanisms, conveyor systems, and robotic arms, this shoulder screw offers reliable performance where high tensile strength and dimensional accuracy are paramount. Its knurled socket head allows for secure torque application, minimizing the risk of stripping during installation in tight spaces.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for superior precision and a shoulder diameter tolerance of -0.004" to -0.002". The UNC coarse thread (1/2"-13) and standard shoulder fit ensure compatibility and ease of assembly. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industries.