S-98070A179 1/4"-20 x 5/8" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with integrated Buna-N rubber O-ring that reliably withstands pressures up to 1500 psi, preventing leaks in demanding applications
• Exceptional corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ensuring long-term durability in harsh environments
• Broad temperature compatibility with O-ring performance maintained from -40° to 225°F, suitable for diverse operating conditions
• Precise thread engagement with Class 2A UNC coarse threads providing reliable fastening and easy installation
• Optimized head design featuring undercut flat head profile for flush mounting and Phillips No. 3 drive for secure torque application
• High tensile strength of 70,000 psi ensures mechanical integrity under significant load conditions
• Regulatory compliance with RoHS 3 and REACH standards, making them suitable for regulated industrial applications

Professional Applications & Engineering Value

This 1/4"-20 UNC flat head screw with integrated Buna-N O-ring seal addresses critical sealing challenges in industrial equipment, hydraulic systems, and pressurized enclosures. The combination of 18-8 stainless steel material and passivated finish provides exceptional corrosion resistance, while the undercut flat head design ensures flush mounting without compromising sealing integrity. Engineered for applications requiring reliable pressure sealing up to 1500 psi, this fastener solves common leakage problems in pumps, valves, and fluid handling systems. The coarse UNC threads with Class 2A fit facilitate quick installation and maintain consistent clamping force, making them ideal for maintenance and OEM applications where time efficiency and reliability are paramount.

Specification Summary & Compliance

This sealing screw features precision 1/4"-20 UNC coarse threads with Class 2A thread fit for consistent engagement and reliable performance. The manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental compliance for industrial applications. The fully threaded design and 100° countersink angle provide optimal fastening characteristics, while the specified maximum hole diameter of 0.265" ensures proper installation guidance for engineering applications.