S-90128A301 1/4"-20 x 1 3/8" 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 from zinc-plated alloy steel construction extends service life in harsh industrial environments.
- Precise Class 3A thread fit provides consistent engagement and vibration resistance, minimizing loosening in dynamic assemblies.
- Fully threaded design offers maximum grip and load distribution along the entire length for enhanced joint integrity.
- High hardness rating (Rockwell C37) ensures excellent wear resistance and durability under repeated use.
- Standard hex drive allows for easy installation and removal with common tools, improving assembly efficiency.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global industrial use.
Professional Applications & Engineering Value
This zinc-plated alloy steel socket head cap screw is engineered to address critical challenges in machinery, automotive, and heavy equipment assembly. The UNC coarse thread and Class 3A fit ensure rapid installation and secure fastening in materials where fine threads may strip or fail. The combination of 170,000 psi tensile strength and Rockwell C37 hardness provides resistance to dynamic loads and abrasion, making it ideal for high-vibration environments. The zinc plating offers a protective barrier against moisture and chemicals, reducing maintenance needs. With its fully threaded design and hex drive, it delivers consistent clamping force and ease of service, supporting efficient production lines and reliable end-products.
Specification Summary & Compliance
This socket head cap screw features a 1/4"-20 UNC coarse thread with Class 3A tolerance for precise fit, and is manufactured to ASTM A574 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for industrial applications requiring environmental and safety standards.
