S-98070A340 8-32 x 5/8" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with silicone O-ring that maintains integrity across extreme temperatures from -150°F to 500°F
• Exceptional corrosion resistance through 18-8 stainless steel construction and passivated surface treatment
• High-pressure capability handling up to 20,000 psi for demanding industrial applications
• Reliable thread engagement with Class 2A UNC coarse threads ensuring secure fastening in various materials
• Optimized flush mounting with standard flat head profile and 100° countersink angle for smooth surface finishes
• Enhanced driving efficiency through Phillips No. 2 drive design for consistent torque application
• Full regulatory compliance meeting RoHS 3 and REACH standards for global industrial use

Professional Applications & Engineering Value

This 8-32 UNC flat head Phillips screw with integrated silicone O-ring sealing addresses critical challenges in industrial environments where fluid containment and pressure management are paramount. The 18-8 stainless steel construction combined with passivated finish provides exceptional corrosion resistance in harsh conditions, while the silicone rubber O-ring maintains sealing integrity across extreme temperature fluctuations from -150°F to 500°F. Engineered with Class 2A thread fit and UNC coarse threading, this fastener delivers reliable performance in high-vibration applications common in machinery, fluid systems, and industrial equipment. The flat head design with standard profile ensures flush mounting where surface clearance is limited, making it ideal for precision assemblies requiring both secure fastening and effective sealing against moisture, gases, and contaminants.

Specification Summary & Compliance

This sealing screw features precision 8-32 UNC coarse threads with Class 2A thread fit tolerance, ensuring consistent engagement and reliable performance. The fastener is manufactured from 18-8 stainless steel with Rockwell B70 hardness and 70,000 psi tensile strength, providing durable mechanical properties. Comprehensive compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting international standards for industrial components. The silicone O-ring is rated for extreme temperature operation from -150°F to 500°F, while the flat head design features a standard profile with 100° countersink angle for optimal seating in prepared holes.