S-90128A851 5-40 x 1/4" 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 under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical applications.
- Fully threaded design allows for maximum grip and uniform load distribution along the entire length.
- High hardness (Rockwell C37) enhances wear resistance and durability, minimizing deformation during installation.
- Hex socket drive (3/32") enables easy installation with standard tools in confined spaces, improving assembly efficiency.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chain requirements.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 5-40 UNC socket head cap screws address common challenges like vibration loosening and corrosion. The zinc-plated alloy steel construction offers robust protection against moisture and chemicals, making them ideal for machinery, automotive, and electronic enclosures. The coarse UNC thread and Class 3A fit provide superior holding power in metals and plastics, reducing maintenance needs. With a fully threaded rod type and hex drive, they ensure quick, secure fastening in tight spaces, enhancing assembly speed and reliability for OEMs and maintenance teams.
Specification Summary & Compliance
This socket head cap screw features a 5-40 UNC coarse thread with Class 3A precision fit, ensuring consistent performance in inch-system applications. It meets ASTM A574 specifications for high-strength alloy steel and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use. Dimensions include a 1/4" length, 0.205" head diameter, and standard socket head profile for reliable integration.
