S-90128A566 1/4"-20 x 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.
- Superior corrosion resistance with zinc plating protects against rust and extends service life in harsh industrial environments.
- Precise Class 3A thread fit provides tight, secure fastening with minimal play, enhancing assembly accuracy and vibration resistance.
- Partially threaded design allows for controlled clamping force and easier alignment in machinery and equipment assemblies.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threads enable quick installation and reduced cross-threading risks, saving time in production and maintenance.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and suitability for regulated industries.
Professional Applications & Engineering Value
This zinc-plated alloy steel socket head cap screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and environmental degradation. The UNC coarse thread and Class 3A fit provide a secure, high-strength connection that withstands dynamic loads in machinery, automotive, and heavy equipment applications. The partial threading allows for precise clamping without over-tightening, reducing stress concentrations. With a 170,000 psi tensile strength and corrosion-resistant zinc plating, it delivers long-term reliability in demanding conditions, minimizing downtime and maintenance costs for B2B clients.
Specification Summary & Compliance
This socket head cap screw adheres to inch system dimensions with a 1/4"-20 UNC thread and Class 3A thread fit for precise tolerances. It meets ASTM A574 specifications for high-strength alloy steel fasteners, ensuring consistent manufacturing quality. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for global industrial use.
