S-90585A125 4-40 x 7/16" 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 and passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term performance
- Precise thread engagement with Class 3A fit and UNC coarse spacing, ensuring secure fastening and vibration resistance
- Flush mounting capability featuring an 82° countersink angle and standard flat head profile for seamless surface integration
- Easy installation and removal with 1/16" hex drive, providing efficient tool engagement in confined spaces
- Full thread coverage across the 7/16" length, maximizing grip and load distribution in assemblies
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
Engineered for demanding environments, these 4-40 UNC flat head screws in 316 Stainless Steel deliver critical corrosion resistance against chemicals, moisture, and salt exposure. The passivated finish enhances surface durability, while the Class 3A thread fit and coarse thread spacing prevent loosening under vibration in machinery, electronics, and marine applications. The 82° countersink angle and flat head design allow for flush mounting, reducing aerodynamic drag and snag risks. With a 70,000 psi tensile strength and fully threaded construction, they ensure uniform stress distribution, making them ideal for precision assemblies requiring high reliability and compliance with industrial standards.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit tolerances per UNC standards, with a head diameter tolerance of -0.037" to 0". Manufacturing conforms to ASME B18.3 specifications, ensuring dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing safety and environmental responsibility for global supply chains.
