S-8077A644 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 thanks to 316 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
- Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance under high stress.
- Precise Class 3A thread fit ensures tight, secure connections and reduces the risk of loosening in critical assemblies.
- Enhanced grip and handling from the knurled head design, allowing for easier manual installation and adjustment.
- Broad regulatory compliance including ASME B18.3 standards, RoHS 3, and REACH, ensuring safety and environmental responsibility.
- Durable socket head with hex drive provides efficient torque transmission and reduces tool slippage during installation.
- Accurate shoulder dimensions with tight tolerances for consistent alignment and spacing in precision machinery.
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. Its robust 1/4"-20 UNC coarse thread and Class 3A fit deliver secure fastening in high-vibration settings, while the knurled socket head enhances usability in tight spaces. Ideal for applications in machinery, automotive, and aerospace, this component ensures long-term reliability by resisting rust and wear, reducing maintenance costs and downtime. The precise shoulder diameter and length facilitate accurate component positioning, making it a go-to choice for precision industrial fasteners.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit per UNC standards, with shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". It meets ASME B18.3 manufacturing specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry acceptance.
