S-8077A645 1/4"-20 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 and black oxide finish, ideal for harsh industrial environments.
- High strength and durability offering 70,000 psi tensile strength and 35,000 psi shear strength for reliable, heavy-duty applications.
- Precise thread engagement with Class 3A UNC coarse threads ensuring secure, vibration-resistant fastening.
- Easy installation and removal featuring a knurled socket head with 3/16" hex drive for non-slip tool grip.
- Accurate alignment and spacing provided by the 3/8" shoulder diameter with tight tolerances for consistent performance.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety.
- Versatile right-hand threading compatible with standard UNC components, simplifying assembly processes.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw with black oxide finish is engineered to address common industrial challenges such as corrosion, misalignment, and mechanical stress. The UNC coarse thread and Class 3A fit provide excellent resistance to loosening under vibration, making it ideal for machinery, automotive assemblies, and precision equipment. The knurled socket head enhances grip during installation, reducing tool slippage and improving efficiency. With its high tensile and shear strength, this shoulder screw ensures long-term reliability in demanding applications, from manufacturing fixtures to robotics, where precise shoulder positioning is critical for optimal performance.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A tolerance for precise fit, a shoulder diameter of 3/8" with tight tolerances (-0.004" to -0.002"), and a hardness of Rockwell B79. It complies with ASME B18.3 specifications and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to industry standards and environmental regulations for safe, high-quality use.
