S-90825A148 4-40 x 5/8" Sealing Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Reliable Sealing Performance: Integrated Buna-N rubber O-ring ensures leak-proof operation, ideal for applications requiring fluid or gas containment under high pressure.
• Exceptional Corrosion Resistance: 18-8 stainless steel construction with passivated finish provides long-lasting durability in harsh or humid environments.
• High-Pressure Capability: Withstands up to 6000 psi, making it suitable for demanding industrial systems where pressure integrity is critical.
• Wide Temperature Tolerance: O-ring maintains sealing effectiveness across a broad range from -40°F to 225°F, ensuring performance in variable conditions.
• Precision Thread Fit: Class 2A UNC coarse threads offer consistent, reliable engagement and ease of installation in standard tapped holes.
• Secure Drive Engagement: Phillips No. 1 drive style combined with a rounded pan head design allows for efficient torque application and a low-profile finish.
• Environmental Compliance: Meets RoHS 3 and REACH standards, ensuring safe use in regulated industries and global markets.

Professional Applications & Engineering Value

This 4-40 UNC rounded head Phillips screw is engineered to address critical sealing challenges in high-pressure applications, such as hydraulic systems, pneumatic controls, and fluid handling equipment. The combination of 18-8 stainless steel and a passivated finish ensures superior resistance to corrosion and wear, extending service life in demanding environments. The integrated Buna-N rubber O-ring provides a dependable seal against leaks, preventing fluid or gas escape even under pressures up to 6000 psi. Its fully threaded coarse UNC design with Class 2A fit guarantees precise alignment and secure fastening, reducing the risk of assembly errors. Ideal for OEMs and maintenance teams, this screw delivers consistent performance in industries like automotive, aerospace, and industrial machinery where reliability and compliance with environmental standards are paramount.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 2A thread fit for standardized compatibility and ease of installation. Manufactured from 18-8 stainless steel with a passivated finish to enhance corrosion resistance, it includes a Buna-N rubber O-ring rated for temperatures from -40°F to 225°F. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial use.