S-90585A220 6-32 x 1 1/2" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated finish
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty performance
• Precise, secure fastening ensured by Class 3A thread fit and fully threaded UNC coarse design, minimizing loosening under vibration
• Streamlined installation and flush finish with a standard 82° countersink angle and 5/64" hex drive for easy, tool-compatible driving
• Guaranteed dimensional consistency and interchangeability, manufactured to meet stringent ASME B18.3 specifications
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries
• Versatile 1-1/2" length and flat head design ideal for applications requiring a smooth surface profile and deep engagement

Professional Applications & Engineering Value

Engineered for demanding settings, these 316 stainless steel flat head screws deliver outstanding performance where corrosion and chemical exposure are concerns. The passivated finish enhances the innate corrosion resistance of 316 stainless steel, making these UNC threaded fasteners a top choice for marine, chemical processing, and industrial equipment. The Class 3A thread fit provides a tighter tolerance than standard fits, reducing the risk of thread stripping and ensuring a secure, vibration-resistant connection in critical assemblies. Combined with a flat head and 82° countersink, they sit flush with surfaces, ideal for aerodynamic or safety-critical applications where protrusions are not permissible. This combination of material, thread precision, and design directly addresses common failure points in harsh operational environments.

Specification Summary & Compliance

This screw features a 6-32 UNC coarse thread with a Class 3A fit for precision threading. It is fully threaded and measures 1-1/2" in length with a head diameter of 0.307". Manufacturing and dimensional compliance adhere to ASME B18.3 specifications. The product is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental and safety regulations for hazardous substances.