S-98070A131 2-56 x 3/16" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Reliable high-pressure sealing with Buna-N rubber O-rings rated for up to 1500 psi, preventing leaks in demanding industrial applications
• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ensuring long-term durability in harsh environments
• Wide temperature compatibility with O-rings performing reliably from -40° to 225°F, maintaining seal integrity across extreme operating conditions
• Secure fastening with precise fit through Class 2A thread tolerance and UNC coarse threading, providing consistent engagement and vibration resistance
• Flush mounting capability with undercut flat head design, allowing countersunk installation for smooth surface finishes
• Easy installation and removal with Phillips No. 1 drive, enabling efficient assembly while maintaining tool compatibility
• Environmental compliance assurance meeting RoHS 3 and REACH standards, supporting sustainable manufacturing practices

Professional Applications & Engineering Value

This 2-56 UNC Flat Head Phillips Screw delivers critical sealing performance where fluid containment and pressure management are paramount. The combination of 18-8 stainless steel construction with passivated finish provides exceptional corrosion resistance for harsh environments including marine, chemical processing, and outdoor equipment. The Buna-N rubber O-ring maintains its sealing integrity across extreme temperature fluctuations from -40° to 225°F, solving common failure points in thermal cycling applications. The undercut flat head profile ensures proper countersinking while the Phillips No. 1 drive facilitates efficient installation in confined spaces. These sealing screws are engineered to prevent costly leaks in hydraulic systems, pneumatic controls, and fluid handling equipment where 1500 psi pressure ratings are critical for operational safety and reliability.

Specification Summary & Compliance

This fastener features 2-56 UNC coarse threading with Class 2A thread fit for precise dimensional accuracy and reliable engagement. The fully threaded design provides consistent clamping force along the entire 3/16" length. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring restricted substance compliance. The 100° countersink angle matches standard chamfered holes while the 0.172" head diameter and 0.035" head height provide optimal flush mounting characteristics for professional installation requirements.