S-90825A340 4-40 x 1/4" Sealing Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior sealing performance with Fluoroelastomer O-rings that reliably withstand pressures up to 6000 psi and temperatures from -20° to 400° F, preventing leaks in demanding environments.
• Excellent corrosion resistance thanks to 18-8 Stainless Steel construction and passivated finish, ensuring long-term durability in harsh industrial settings.
• Precise and reliable fastening with Class 2A thread fit and UNC coarse threading, providing consistent engagement and reducing the risk of cross-threading.
• Easy installation and removal with Phillips drive (No. 1) and rounded pan head design, allowing for efficient assembly with standard tools.
• Full thread coverage along the 1/4" length for maximum grip and load distribution, enhancing joint integrity in critical applications.
• Compliance with environmental regulations, meeting RoHS 3 and REACH standards for safe and sustainable use in global markets.
• Versatile right-hand threading and standard pan head profile for broad compatibility with existing components and systems.

Professional Applications & Engineering Value

This 4-40 UNC Rounded Head Phillips screw is engineered to address critical sealing challenges in industrial and mechanical assemblies. The combination of 18-8 Stainless Steel and a passivated finish provides robust resistance to corrosion, extending service life in moist or chemically aggressive environments. The integrated Fluoroelastomer O-ring ensures a reliable seal against fluids and gases, making it ideal for applications in hydraulic systems, pneumatic controls, and automotive components where pressure integrity is paramount. Its Class 2A thread fit and coarse UNC threading facilitate quick installation while maintaining precise alignment, reducing assembly time and minimizing the risk of fastener failure. This screw is a trusted solution for engineers seeking durability, compliance, and performance in sealing fasteners.

Specification Summary & Compliance

This screw features a 4-40 UNC thread size with Class 2A fit for consistent dimensional accuracy and coarse threading suitable for general industrial use. It is manufactured from 18-8 Stainless Steel with a passivated finish to enhance corrosion resistance. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for hazardous substance restrictions.