S-90044A128 1/4"-20 x 2 3/4" 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 in high-stress applications, reducing the risk of fastener failure.
- Corrosion-resistant black-oxide coating on alloy steel enhances durability and longevity in harsh industrial environments.
- Precise Class 3A thread fit provides superior engagement and vibration resistance for secure, long-lasting assemblies.
- Hex socket drive design allows for easy installation and removal with standard tools, minimizing assembly time.
- Fully threaded construction offers consistent clamping force along the entire length for uniform load distribution.
- Coarse UNRC threading enables quick assembly and disassembly, improving maintenance efficiency.
- Rockwell C37 hardness ensures high wear resistance, maintaining thread integrity over repeated use.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in demanding industrial settings. Its high tensile strength and Rockwell C37 hardness make it ideal for heavy machinery, automotive assemblies, and construction equipment where vibration and dynamic loads are common. The corrosion-resistant coating protects against rust and degradation in humid or chemically exposed environments, extending service life. With its Class 3A thread fit and coarse UNRC threads, it ensures rapid, secure fastening in applications requiring frequent maintenance or adjustments, reducing downtime and enhancing operational efficiency for engineers and maintenance teams.
Specification Summary & Compliance
This fastener features a 1/4"-20 thread size with Class 3A precision fit and coarse thread spacing per UNRC standards, ensuring dimensional accuracy and reliable performance. It complies with ASTM A574 specifications for high-strength socket head cap screws, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and material restrictions.
