S-91251A538 1/4"-20 x 9/16" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head 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
- Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
- Class 3A thread fit provides superior precision and tight tolerances, enabling secure fastening with minimal backlash in critical assemblies.
- Black-oxide surface treatment on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial environments.
- Fully threaded design allows for consistent engagement along the entire length, improving load distribution and vibration resistance.
- Hex socket drive facilitates easy installation with standard tools, reducing assembly time and minimizing stripping risks.
- Coarse UNC threading ensures quick and efficient installation, ideal for applications requiring rapid disassembly and reassembly.
- Compliance with ASTM A574 guarantees material quality and manufacturing consistency, providing peace of mind for engineering specifications.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening and corrosion-induced degradation. The UNC coarse thread and Class 3A fit deliver precise alignment and robust holding power, making it ideal for machinery, automotive, and heavy equipment assemblies where reliability is critical. The fully threaded rod type ensures uniform stress distribution, reducing the likelihood of fatigue failure in dynamic load conditions. With a Rockwell C37 hardness and 170,000 psi tensile strength, it withstands extreme operational stresses while the hex drive design allows for efficient torque application in confined spaces, streamlining maintenance and reducing downtime.
Specification Summary & Compliance
This socket head cap screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for high precision. It adheres to ASTM A574 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
