S-93791A409 4-40 x 3/8" ASME B18.3 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 18-8 stainless steel construction and black-oxide passivated finish, ensuring long-term reliability in harsh environments.
- Exceptional tensile strength rated at 70,000 psi, providing secure and durable fastening for demanding industrial applications.
- Precise Class 3A thread fit for tighter tolerances and improved assembly accuracy, reducing the risk of loosening or failure.
- Fully threaded design with coarse UNC spacing, enabling faster installation and consistent grip across the entire length.
- Standard 82° countersink angle allows for a flush, low-profile finish, ideal for applications where a smooth surface is critical.
- Hex drive (1/16") compatibility offers easy installation and removal with common tools, enhancing workflow efficiency.
- Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, environmental responsibility, and global acceptance.
Professional Applications & Engineering Value
These 4-40 UNC flat head screws are engineered to address common industrial challenges, such as vibration-induced loosening and environmental degradation. The 18-8 stainless steel material, combined with a black-oxide passivated finish, provides excellent resistance to corrosion and oxidation, making them ideal for outdoor equipment, marine hardware, and chemical processing machinery. The Class 3A thread fit ensures minimal play and reliable performance in precision assemblies, while the coarse thread spacing facilitates quick installation in various substrates. With a Rockwell B55 hardness and 70,000 psi tensile strength, these screws maintain integrity under stress, reducing maintenance needs and downtime in industrial fastening applications.
Specification Summary & Compliance
This product adheres to Class 3A thread fit for precise dimensional accuracy, with UNC coarse thread spacing and right-hand threading. Manufactured in accordance with ASME B18.3 specifications, it ensures consistency and reliability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental safety and regulatory adherence, supporting sustainable procurement practices.
