S-90825A344 4-40 x 3/8" Sealing Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated Fluoroelastomer O-Ring creates a reliable seal capable of withstanding pressures up to 6000 psi, preventing leaks in critical applications.
• Excellent Corrosion Resistance: Manufactured from 18-8 Stainless Steel with a passivated finish for enhanced durability and long-term performance in harsh, corrosive environments.
• High-Temperature & Chemical Resilience: The O-Ring material maintains integrity across a wide temperature range from -20° to 400° F, ensuring consistent sealing under thermal stress.
• Optimized for Easy Installation: The Phillips drive (No. 1) and rounded pan head design facilitate quick, secure fastening with standard tools, reducing assembly time.
• Precision Thread Fit for Reliability: Features a Class 2A thread fit and coarse UNC threading, providing consistent engagement and vibration resistance for stable connections.
• High Tensile Strength: With a 70,000 psi tensile strength and full threading, this screw delivers robust mechanical performance under high-stress conditions.
• Compliant for Global Use: Adheres to RoHS 3 and REACH regulations, ensuring environmental safety and suitability for international industrial markets.

Professional Applications & Engineering Value

This 4-40 UNC Rounded Head Phillips Sealing Screw is engineered to address common industrial challenges such as fluid leakage, component corrosion, and assembly inefficiency. The core value lies in its 18-8 Stainless Steel construction and passivated finish, which provide exceptional resistance to rust and chemical exposure, extending service life in demanding settings like chemical processing or marine equipment. The inclusion of a Fluoroelastomer O-Ring is critical for creating a high-integrity seal in systems operating under high pressure (up to 6000 psi) and variable temperatures, making it ideal for hydraulic systems, pneumatic controls, and automotive assemblies. Its coarse thread spacing and Class 2A fit ensure quick, precise installation with minimal risk of cross-threading, reducing downtime and maintenance costs. This combination of sealing capability, material durability, and dimensional accuracy makes it a reliable choice for engineers seeking to enhance system reliability and operational safety.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit and UNC coarse thread specifications (size 4-40), ensuring compatibility and interchangeability. It is manufactured with a passivated finish and fully threaded design for consistent performance. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environments with strict environmental and safety requirements.