S-8077A648 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, ideal for harsh environments and extended service life.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in heavy-duty applications.
- Precise Class 3A thread fit ensures secure, vibration-resistant fastening and consistent assembly quality.
- Enhanced grip and tool engagement from the knurled head and hex socket drive, preventing slippage during installation.
- Durable black oxide finish provides added corrosion protection and a professional, non-reflective appearance.
- Accurate shoulder dimensions with tight tolerances for precise location and alignment of components.
- Full compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw with a black oxide finish is engineered to address critical challenges in industrial settings, such as corrosion in marine or chemical environments and the need for high-strength fastening under dynamic loads. The 1/4"-20 UNC coarse thread and Class 3A thread fit provide excellent resistance to loosening from vibrations, making it ideal for machinery, automotive assemblies, and precision equipment. The knurled socket head and hex drive allow for secure tool engagement, reducing installation errors. Its robust 70,000 psi tensile strength and compliant shoulder dimensions ensure reliable performance in applications like pivots, spacers, and rotating parts, enhancing operational durability and reducing maintenance needs.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with a Class 3A thread fit for high precision, and shoulder dimensions including a diameter of 3/8" (tolerance: -0.004" to -0.002") and length of 1/4" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe and sustainable use in industrial applications.
