S-90585A206 4-40 x 3/4" 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 316 stainless steel and passivated finish, ideal for harsh industrial environments
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
- Precise Class 3A thread fit provides secure fastening with minimal risk of loosening
- Full UNC coarse threading enables faster installation and better grip in various materials
- 82° countersink angle and flat head design allows for flush mounting in assembled components
- Hex drive compatibility facilitates easy installation and removal with standard tools
- Compliance with ASME B18.3, RoHS 3, and REACH ensures quality and environmental safety for global applications
Professional Applications & Engineering Value
This 316 stainless steel flat head screw with 4-40 UNC threading is engineered to address critical challenges in industrial assembly, including exposure to corrosive chemicals, saltwater, and high-moisture environments. The passivated finish significantly enhances surface durability, preventing oxidation and extending service life in applications such as marine equipment, chemical processing machinery, and food-grade installations. Its Class 3A thread fit and coarse thread spacing provide superior holding power in soft metals and plastics, reducing the risk of strip-out during repeated disassembly. The flat head profile with 82° countersink ensures a smooth, flush finish, eliminating protrusions in precision assemblies while the hex drive allows for high-torque installation without cam-out, making it a reliable choice for maintenance-critical and high-vibration settings.
Specification Summary & Compliance
This screw maintains precise dimensional tolerances, including a head diameter of 0.255" with specified tolerance and Class 3A thread fit per UNC standards. Manufacturing adheres to ASME B18.3 specifications, ensuring consistent quality and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated industries and international markets.
