S-90825A852 1/4"-28 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 withstands pressures up to 6000 psi, preventing leaks in critical applications.
• Excellent corrosion resistance from 18-8 stainless steel and passivated finish, ensuring long-term durability in harsh environments.
• Wide temperature tolerance from -80° to 400°F, making it suitable for extreme thermal conditions without degradation.
• Precise thread engagement with Class 2A fit and UNF fine threads, providing reliable, vibration-resistant connections.
• Easy installation thanks to the Phillips No. 3 drive and rounded pan head design, reducing assembly time and effort.
• Full threading for consistent grip along the entire 1/2" length, enhancing load distribution and stability.
• Compliance with environmental standards including RoHS 3 and REACH, ensuring safe, sustainable use in regulated industries.

Professional Applications & Engineering Value

This 1/4"-28 UNF rounded head Phillips screw is engineered to address common industrial challenges such as fluid leakage, corrosion, and high-pressure failures. Constructed from 18-8 stainless steel with a passivated finish, it resists rust and chemical exposure, ideal for machinery, automotive, and plumbing systems. The integrated silicone rubber O-ring creates a reliable seal in applications up to 6000 psi, while the fine UNF threads and Class 2A fit ensure tight, secure fastening that minimizes loosening under vibration. Its rounded pan head and Phillips drive facilitate quick installation, reducing labor costs and improving efficiency in assembly lines. Suitable for OEM and MRO uses, this sealing fastener delivers consistent performance in demanding environments like hydraulic systems and temperature-controlled equipment.

Specification Summary & Compliance

This fastener features precise Class 2A thread fit and adheres to UNF fine thread standards (1/4"-28) for accurate engagement. It is manufactured with a passivated finish and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The specifications include a maximum hole diameter of 0.269" and full threading for uniform application, supporting reliable performance in industrial settings.