S-90585A126 4-40 x 7/8" 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 from 316 Stainless Steel with passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
- Precision thread engagement with Class 3A fit and UNC coarse threads ensuring reliable fastening performance
- Optimal flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
- Enhanced torque transmission through hex drive design preventing tool slippage during installation
- Full thread coverage across the 7/8" length providing maximum grip and load distribution
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for quality and safety
Professional Applications & Engineering Value
These 4-40 UNC flat head screws in 316 Stainless Steel address critical challenges in industrial fastening where corrosion resistance and mechanical reliability are paramount. The passivated finish significantly enhances the material's natural corrosion resistance, making these hex drive screws ideal for marine, chemical processing, and outdoor applications. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of cross-threading while maintaining vibration resistance. With 70,000 psi tensile strength and fully threaded design, these industrial screws provide consistent clamping force across the entire 7/8" length, preventing joint loosening in high-stress environments. The 82° countersink angle allows for flush mounting in precision assemblies where surface profile is critical.
Specification Summary & Compliance
Manufactured to exacting inch system dimensions with Class 3A thread fit per UNC standards, ensuring precise dimensional accuracy. The flat head screws comply with ASME B18.3 specifications where applicable and meet critical regulatory requirements including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards. The 316 Stainless Steel construction with passivated finish provides enhanced corrosion protection while maintaining the mechanical properties required for demanding industrial applications.
