S-90825A863 1/4"-28 x 1/2" Sealing Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance – Integrated Fluoroelastomer O-ring ensures reliable sealing up to 6000 psi, preventing leaks in high-pressure systems.
• Exceptional Corrosion Resistance – 18-8 Stainless Steel with passivated finish offers long-term durability in harsh or humid environments.
• High Tensile Strength – Withstands up to 70,000 psi tensile load, providing secure fastening in demanding mechanical assemblies.
• Precision Thread Fit – Class 2A thread fit and UNF fine threading ensure smooth installation and vibration resistance.
• Wide Temperature Tolerance – O-ring functions effectively from -20°F to 400°F, suitable for varied thermal conditions.
• Ease of Installation – Phillips No. 3 drive and rounded pan head design allow for quick, tool-friendly assembly.
• Regulatory Compliance – Meets RoHS 3 and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 1/4"-28 UNF Rounded Head Phillips Screw is engineered for applications requiring dependable sealing under extreme pressure and temperature fluctuations. The 18-8 Stainless Steel construction, combined with a passivated finish, resists corrosion in industrial settings such as hydraulic systems, pumps, and fluid handling equipment. The Fluoroelastomer O-ring maintains integrity across a broad temperature range (-20° to 400°F), preventing failure in thermal cycling environments. With a maximum pressure rating of 6000 psi and fully threaded design, it ensures uniform clamping force and eliminates leakage points, making it ideal for OEM and MRO uses where reliability is critical.

Specification Summary & Compliance

This fastener features a 1/4"-28 UNF fine thread with Class 2A thread fit for precise engagement and dimensional accuracy. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances. The screw is fully threaded, with a rounded pan head and Phillips drive for standard tool compatibility, and is rated for use in holes up to 0.269" diameter.