S-90585A041 1/4"-20 x 1 3/8" 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
- Exceptional corrosion resistance in harsh environments due to 316 stainless steel construction and passivated finish
- Superior mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term fastening
- Precise, vibration-resistant fit ensured by Class 3A thread fit and coarse UNC threads for easier assembly in industrial settings
- Streamlined installation and flush finish with a standard 82° countersink angle and convenient 5/32" hex drive
- Full-length threading provides maximum grip and holding power across the entire 1 3/8" length
- Regulatory peace of mind with compliance to ASME B18.3, RoHS 3, and REACH standards
- Dimensional consistency guaranteed by controlled head diameter tolerance for uniform performance in repetitive applications
Professional Applications & Engineering Value
This 1/4"-20 UNC flat head screw is engineered to solve critical challenges in demanding industrial environments. The 316 stainless steel material offers superior resistance to chlorides and corrosive agents, making it ideal for marine, chemical processing, and food industry applications where failure is not an option. The combination of a passivated finish and Class 3A thread fit ensures not only enhanced corrosion protection but also a precise, secure fit that minimizes the risk of loosening under vibration. The flat head with 82° countersink and hex drive allows for a clean, flush installation and high-torque assembly, providing a reliable fastening solution for machinery, structural components, and equipment requiring a low-profile, high-strength connection.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC coarse thread with a precision Class 3A thread fit, ensuring excellent interchangeability and dimensional accuracy. Manufacturing and dimensional specifications conform to ASME B18.3. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industries.
