S-90825A618 4-40 x 1/2" Sealing Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior sealing performance with a silicone rubber O-ring that maintains integrity across extreme temperatures from -80° to 400° F, preventing leaks in demanding environments.
• High-pressure resistance up to 6000 psi ensures reliable operation in hydraulic and pneumatic systems without failure.
• Excellent corrosion resistance from 18-8 Stainless Steel and passivated finish, extending service life in harsh or humid conditions.
• Easy installation and removal with a Phillips #1 drive and rounded pan head design, reducing assembly time and tool slippage.
• Precise thread engagement with UNC coarse threads and Class 2A fit, providing secure fastening and vibration resistance.
• Full threading along the 1/2" length allows for consistent sealing force and adaptability in various material thicknesses.
• Compliance with RoHS 3 and REACH regulations guarantees environmental safety and suitability for global industrial markets.

Professional Applications & Engineering Value

This 4-40 UNC rounded head sealing screw is engineered to address critical sealing challenges in high-pressure industrial applications, such as fluid power systems, machinery enclosures, and automotive components. The combination of 18-8 Stainless Steel and a passivated finish provides robust corrosion resistance, while the silicone rubber O-ring ensures a tight seal against moisture, gases, and contaminants. Its coarse thread design and Class 2A thread fit facilitate quick installation and reliable performance under vibration, reducing maintenance needs. Ideal for OEMs and MRO professionals, this screw delivers durability and compliance, supporting efficient operations in sectors like manufacturing, aerospace, and energy.

Specification Summary & Compliance

The screw adheres to UNC coarse thread standards with a Class 2A thread fit for precise dimensional accuracy, ensuring consistent performance in threaded holes up to 0.127" maximum diameter. It is fully threaded for uniform sealing and manufactured from 18-8 Stainless Steel with a passivated finish to enhance corrosion protection. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming adherence to environmental and safety regulations for industrial use.