S-90128A311 4-40 x 7/16" ASME B18.3, ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc plating protects against rust and environmental damage, extending service life in harsh conditions.
- Precise Class 3A thread fit provides consistent engagement and vibration resistance, minimizing loosening in dynamic assemblies.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated installations.
- Standard hex drive design allows for easy installation with common tools, speeding up assembly and maintenance processes.
- Full threading and coarse UNC pattern enable quick fastening and strong holding power in various materials.
- Compliance with ASME B18.3 and environmental standards ensures quality, safety, and regulatory acceptance for global supply chains.
Professional Applications & Engineering Value
This 4-40 UNC Socket Head Cap Screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and corrosion in demanding environments. Constructed from zinc-plated alloy steel, it combines high tensile strength with a protective coating that resists moisture and chemicals, ideal for machinery, automotive, and electronic enclosures. The Class 3A thread fit and coarse UNC threads ensure secure fastening in metals and plastics, reducing maintenance needs. Its fully threaded, right-hand design and hex drive facilitate efficient assembly, making it a reliable choice for applications requiring high-strength screws with long-term durability and compliance to industry standards.
Specification Summary & Compliance
This product adheres to precise dimensional tolerances, including a Class 3A thread fit per UNC standards and specifications met under ASME B18.3 and ASTM A574. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for international markets.
