S-90585A644 4-40 x 1/8" ASME B18.3, ASTM F879 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 construction, ideal for harsh environments and extended service life.
- Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, high-stress fastening.
- Precision thread fit with Class 3A tolerance ensuring secure, vibration-resistant connections and simplified assembly.
- Optimized for flush mounting featuring a standard flat head with an 82° countersink angle for a smooth, professional finish.
- Enhanced drive stability provided by the 1/16" hex drive, allowing for secure tool engagement and efficient installation.
- Versatile coarse threading with UNC 4-40 fully threaded design for rapid installation and strong holding power in various materials.
- Guaranteed compliance and reliability, meeting ASME B18.3, ASTM F879, RoHS 3, and REACH standards for safe, industrial-grade use.
Professional Applications & Engineering Value
This 4-40 UNC flat head screw is engineered from 316 Stainless Steel to address critical challenges in industrial and marine applications where corrosion and high stress are prevalent. The Class 3A thread fit and coarse UNC threading ensure a precise, durable connection that resists loosening under vibration, making it ideal for machinery, electronic enclosures, and structural assemblies. The fully threaded design and 82° countersink angle allow for a flush, secure fit in pre-drilled holes, enhancing both aesthetic appeal and functional integrity. With a hex drive for reliable torque application, this screw provides consistent performance in demanding environments, reducing maintenance needs and improving overall assembly longevity.
Specification Summary & Compliance
This screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and a head diameter tolerance of -0.037" to 0". It conforms to ASME B18.3 and ASTM F879 specifications, ensuring consistent quality and performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for global industrial use.
