S-98070A590 1/4"-20 x 1" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with silicone rubber O-ring that withstands extreme temperatures from -80° to 400°F, preventing leaks in demanding environments
• Exceptional corrosion resistance through 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh conditions
• High-pressure capability rated for 6000 psi maximum pressure, making it ideal for hydraulic and pneumatic applications
• Precise thread engagement with Class 2A thread fit and UNC coarse threading for reliable installation and vibration resistance
• Flush mounting design featuring undercut flat head profile that sits perfectly countersunk for smooth surface finishes
• Easy installation with Phillips No. 3 drive style that provides secure torque application during assembly
• Regulatory compliance meeting RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

This 1/4-20 UNC flat head Phillips screw delivers critical sealing performance in industrial applications where fluid containment and pressure integrity are paramount. The combination of 18-8 stainless steel material with passivated finish provides exceptional corrosion resistance for harsh environments, while the silicone rubber O-ring maintains its sealing properties across extreme temperature ranges from -80° to 400°F. The undercut flat head profile ensures proper countersinking for flush mounting in machinery, enclosures, and fluid systems. Engineered with Class 2A thread fit and coarse thread spacing, this fully threaded fastener offers reliable engagement and vibration resistance in high-pressure applications up to 6000 psi, making it ideal for hydraulic systems, pneumatic equipment, and industrial machinery requiring dependable sealing solutions.

Specification Summary & Compliance

This sealing screw features precision 1/4"-20 UNC coarse threads with Class 2A thread fit for consistent engagement and assembly reliability. The manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility. The fully threaded design provides maximum holding power, while the 100° countersink angle and undercut head profile deliver optimal flush mounting performance. With a tensile strength of 70,000 psi and compatibility with maximum hole diameter of 0.265", this fastener meets industrial standards for pressure-rated sealing applications.