S-98070A181 1/4"-20 x 3/4" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with integrated Buna-N rubber O-ring that withstands pressures up to 1500 psi, preventing leaks in demanding applications
• Excellent corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Wide temperature compatibility from -40° to 225°F, maintaining sealing integrity across extreme thermal conditions
• Precise thread engagement with Class 2A UNC coarse threads providing reliable fastening and easy installation
• Optimized head design featuring undercut flat profile and 100° countersink angle for flush mounting and improved aesthetics
• High tensile strength of 70,000 psi ensures structural integrity under mechanical stress
• Environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries

Professional Applications & Engineering Value

This 1/4"-20 UNC flat head Phillips screw delivers exceptional engineering value in applications requiring reliable sealing performance under pressure. The combination of 18-8 stainless steel material and passivated finish provides superior corrosion resistance for harsh industrial environments, while the integrated Buna-N rubber O-ring creates an effective seal against fluids and gases. The undercut flat head profile ensures proper seating in countersunk holes, making it ideal for machinery, fluid handling systems, and equipment where flush surfaces are critical. With fully threaded construction and Class 2A thread fit, installation is straightforward while maintaining consistent clamping force. These features make it particularly valuable in industrial applications where both mechanical fastening and environmental sealing are required.

Specification Summary & Compliance

This sealing screw maintains precise Class 2A thread fit according to UNC standards with 1/4"-20 thread size and coarse spacing. The flat head design features a 100° countersink angle and undercut profile for optimal installation. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory compliance for industrial use worldwide.