S-90729A614 4-40 x 3/8" Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive Flat 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
- Superior corrosion resistance with 316 Stainless Steel and passivated finish, ideal for harsh marine and chemical environments.
- High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under demanding loads.
- Precision Class 3A thread fit provides secure, vibration-resistant connections with minimal risk of loosening.
- Undercut flat head design allows for flush mounting, reducing protrusion and improving aesthetics in finished assemblies.
- Hex drive (1/16") compatibility enables easy installation and removal with standard tools, saving time on the production line.
- Full threading and coarse thread spacing facilitate quick insertion and strong grip in various materials.
- Compliance with RoHS 3 and REACH standards ensures environmental safety and regulatory acceptance for global supply chains.
Professional Applications & Engineering Value
Engineered for demanding industrial, marine, and chemical applications, this 4-40 UNC flat head screw addresses critical challenges like corrosion, vibration, and assembly efficiency. The 316 Stainless Steel material combined with a passivated finish offers exceptional resistance to chlorides and acidic conditions, preventing premature failure in harsh environments. Its Class 3A thread fit and fully threaded coarse spacing ensure tight, reliable fastening that withstands dynamic stresses, while the undercut flat head provides a seamless fit in countersunk holes, reducing drag and improving aerodynamic or fluid flow profiles. These features make it an ideal choice for precision equipment, offshore structures, and chemical processing systems where durability and compliance are paramount.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a Class 3A thread fit for precise dimensional accuracy, including a head diameter of 0.255" and length of 3/8". It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Manufacturing specifications include a tensile strength of 70,000 psi, Rockwell B70 hardness, and a 100° countersink angle for consistent performance in industrial applications.
