S-90585A208 4-40 x 1" 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 chemical exposure
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term performance
- Precise flush mounting enabled by the 82° countersink angle and standard flat head profile for seamless surface integration
- High-reliability threading with Class 3A fit and UNC coarse thread spacing, ensuring secure fastening and vibration resistance
- Enhanced durability and chemical resistance from the passivated finish, extending service life in demanding conditions
- Efficient installation and removal with the 1/16" hex drive, providing positive torque transmission and reducing tool slippage
- Full-length thread engagement across the 1" length for maximum grip and load distribution in assemblies
Professional Applications & Engineering Value
These 4-40 UNC flat head screws in 316 stainless steel are engineered to address critical challenges in industrial and marine applications where corrosion resistance and structural integrity are paramount. The passivated finish enhances surface durability against oxidants and chlorides, while the Class 3A thread fit and coarse thread spacing provide superior vibration resistance and ease of assembly in high-stress environments. Ideal for equipment manufacturing, chemical processing, and offshore installations, these hex drive screws ensure reliable performance in assemblies requiring flush surface mounting and repeated maintenance cycles, minimizing downtime and replacement costs.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with precise dimensional tolerances, including a head diameter of 0.255" and Class 3A thread fit for consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence. Threading follows UNC standards with right-hand direction and fully threaded design for uniform load-bearing capacity.
