S-8077A679 1/4"-28 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and chemical exposure.
- Enhanced durability and wear resistance from the Black Oxide finish, providing added protection and a non-reflective surface.
- Precise and secure fastening thanks to the Class 3A thread fit and UNF fine threading, minimizing the risk of loosening under vibration.
- High mechanical strength with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable performance under heavy loads.
- Easy installation and removal using a standard hex drive (3/16"), combined with a knurled head for improved grip during manual handling.
- Accurate alignment and spacing provided by the precisely machined shoulder, maintaining component position in assemblies.
- 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 with a Black Oxide finish is engineered to address common industrial challenges such as corrosion, misalignment, and mechanical failure. The UNF fine thread and Class 3A fit deliver tight tolerances, reducing backlash in precision equipment like machinery, automotive systems, and electronic enclosures. The socket head with hex drive allows for efficient torque application in confined spaces, while the knurled texture enhances handling. Its high tensile and shear strength ensures longevity in dynamic applications, making it a reliable choice for industrial shoulder screws in demanding sectors.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise engagement. Dimensions include a 1/4"-28 UNF thread, 3/8" shoulder length, and tight tolerances (e.g., shoulder diameter tolerance of -0.004" to -0.002"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring environmental and safety standards are met for global industrial use.
