S-98070A182 1/4"-20 x 1" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated Buna-N rubber O-ring creates a reliable seal against fluids and contaminants, withstanding pressures up to 1500 psi for leak-proof assemblies.
• Exceptional Corrosion Resistance: 18-8 Stainless Steel construction with passivated finish ensures long-term durability in harsh environments, reducing maintenance and replacement costs.
• Wide Temperature Tolerance: Operates effectively from -40° to 225°F, maintaining seal integrity and mechanical performance in extreme thermal conditions.
• Optimized Head Design: Undercut flat head with 100° countersink angle provides a flush, secure fit that enhances sealing and prevents head protrusion.
• Precision Thread Fit: Class 2A UNC coarse threads ensure easy installation and consistent clamping force, reducing assembly time and improving joint reliability.
• Full Thread Engagement: Fully threaded design maximizes grip length and load distribution, enhancing connection strength in demanding applications.
• Regulatory Compliance: Meets RoHS 3 and REACH standards, ensuring environmental safety and global acceptance for industrial use.

Professional Applications & Engineering Value

This 1/4"-20 UNC flat head Phillips screw is engineered to solve critical sealing challenges in industrial environments where fluid containment and corrosion resistance are paramount. The combination of 18-8 stainless steel with a passivated finish provides exceptional protection against corrosive elements, while the integrated Buna-N rubber O-ring creates a reliable barrier against moisture, gases, and contaminants. The undercut flat head profile with 100° countersink angle ensures a flush installation that maximizes surface contact and prevents leakage paths. Ideal for sealing applications in hydraulic systems, pneumatic equipment, and outdoor machinery, this fastener maintains performance across a broad temperature range from -40° to 225°F, making it suitable for both cryogenic and elevated temperature environments where consistent sealing performance is critical.

Specification Summary & Compliance

This sealing screw features Class 2A thread fit with UNC coarse threading for reliable engagement and meets standard dimensional requirements for industrial fasteners. Manufactured from 18-8 stainless steel with passivated finish, it maintains dimensional stability and corrosion resistance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and regulatory acceptance for global industrial applications.