S-8077A563 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
• Enhanced durability and reduced galling from the black oxide finish, extending service life
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Precise component alignment ensured by the knurled head and Class 3A thread fit, minimizing assembly errors
• Secure, high-torque installation via the 3/8" hex socket drive, preventing tool slippage
• Reliable performance in high-vibration settings due to the coarse 1/2"-13 UNC threads and standard shoulder fit
• Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH for global supply chain suitability

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial applications such as machinery assembly, conveyor systems, and precision tooling. The black oxide finish not only enhances corrosion resistance but also reduces friction during installation, protecting the socket head and UNC coarse threads from wear. Its 1 1/2" shoulder length and precise shoulder diameter provide stable pivoting and alignment for rotating parts, reducing misalignment and component stress. With a Rockwell B79 hardness and high tensile strength, it withstands repetitive loads and harsh conditions, making it a reliable heavy-duty fastener for OEM and MRO needs.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit and UNC coarse thread standards for consistent engagement. Shoulder dimensions include a diameter of 3/4" (tolerance: -0.004" to -0.002") and length of 1 1/2" (tolerance: -0.005" to 0.005") to ensure precision. It conforms to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.