S-8077A356 3/8"-24 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 and black oxide finish, ideal for harsh environments and extended service life.
- Enhanced grip and anti-slip performance from the knurled socket head, ensuring secure tool engagement during installation.
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications.
- Precise alignment and reduced wear due to the 1/2" shoulder diameter with tight tolerances, providing stable bearing surfaces.
- Reliable thread engagement with Class 3A UNF fine threads, offering superior fit and vibration resistance.
- Broad regulatory compliance including ASME B18.3, RoHS, and REACH, ensuring safety and environmental standards are met.
- Versatile drive compatibility using a standard 1/4" hex drive for easy installation with common tools.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assembly and machinery. The black oxide finish enhances corrosion resistance, making it suitable for applications exposed to moisture, chemicals, or outdoor conditions. Its Class 3A UNF fine threads provide excellent clamping force and vibration resistance, reducing the risk of loosening in dynamic systems. The knurled socket head ensures reliable torque transmission, minimizing cam-out during high-stress installations. Commonly used in industrial fasteners for pivots, rotating shafts, and spacers, this screw’s 1/2" shoulder diameter acts as a precise locating surface, maintaining alignment and reducing wear on components. Ideal for automotive, aerospace, and manufacturing sectors where durability and precision are paramount.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit ensuring tight tolerances and superior thread engagement. The shoulder diameter tolerance is maintained between -0.004" to -0.002", and the shoulder length tolerance from -0.005" to 0.005" for precise dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial applications.
