S-91802A544 1/4"-20 x 1 1/4" ASME B18.6.3 Stainless Steel Phillips Oval Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable, long-term performance
• Optimized for flush mounting thanks to the standard oval head profile and 82° countersink angle, providing a smooth, professional finish
• Efficient installation and removal with the No. 3 Phillips drive, reducing tool slippage and assembly time
• Wide compatibility and secure fastening ensured by the UNC coarse thread and Class 2A thread fit
• Maximum grip and holding power from the fully threaded design along the entire 1-1/4" length
• Guaranteed quality and safety through compliance with ASME B18.6.3, RoHS 3, and REACH regulations

Professional Applications & Engineering Value

This 1/4"-20 oval head screw is engineered to solve critical fastening challenges in demanding applications. The passivated 18-8 stainless steel provides excellent resistance to oxidation and chemical exposure, making it suitable for outdoor equipment, marine hardware, and food processing machinery where moisture is a concern. The oval head with an 82° countersink angle is designed to sit flush with the material surface, preventing snagging and creating a clean, aerodynamic profile—essential in assembly lines, enclosures, and consumer products. The combination of UNC coarse threads and a Class 2A thread fit ensures quick, reliable engagement in a variety of materials, from metal to plastic, reducing the risk of cross-threading. With its fully threaded shank and high tensile strength, this Phillips drive screw delivers consistent clamping force and vibration resistance, making it a trusted component for structural assemblies, automotive parts, and heavy-duty industrial fixtures.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with a Class 2A thread fit, ensuring standard dimensional accuracy and reliable engagement. It is manufactured in accordance with the ASME B18.6.3 specification for dimensional and mechanical requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for use in various markets and applications.