S-8077A559 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
• Enhanced durability and wear resistance from the black oxide finish, providing added protection against rust and galling
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under heavy loads
• Precise thread engagement with Class 3A fit ensuring secure, vibration-resistant fastening in critical assemblies
• Easy installation and removal thanks to the knurled socket head and 3/8" hex drive, allowing for high-torque application without slippage
• Accurate shoulder positioning with tight diameter and length tolerances for consistent alignment in machinery and pivoting applications
• Compliance with industry standards including ASME B18.3, RoHS, and REACH, ensuring safety and environmental responsibility

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw with black oxide finish is engineered to address common industrial challenges like misalignment, corrosion, and mechanical stress. The UNC coarse thread and Class 3A thread fit provide excellent holding power in high-vibration environments, reducing maintenance needs. The precision-machined shoulder ensures accurate component spacing in assemblies such as rotating machinery, conveyor systems, and pivoting joints. Its high tensile and shear strength makes it suitable for demanding applications in automotive, aerospace, and marine sectors, where corrosion resistance and reliability are paramount. The knurled socket head enhances grip during installation, speeding up assembly without compromising integrity.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit for precise engagement and meets ASME B18.3 specifications. Dimensions include a 1/2"-13 UNC coarse thread with 7/8" length, 3/4" shoulder diameter (tolerance: -0.004" to -0.002"), and 1" shoulder length (tolerance: -0.005" to 0.005"). Material hardness is Rockwell B79, with tensile strength of 70,000 psi and minimum shear strength of 35,000 psi. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets environmental and safety regulations for industrial use.