S-98070A510 4-40 x 5/8" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated silicone O-ring creates reliable seals against fluids and gases, rated for pressures up to 6000 psi
• Exceptional Temperature Resilience: Silicone O-ring maintains integrity across extreme temperatures from -80° to 400° F
• Enhanced Corrosion Resistance: 18-8 stainless steel construction with passivated finish provides excellent protection against rust and chemical degradation
• Precision Thread Engagement: Class 2A thread fit ensures consistent, reliable fastening with reduced risk of cross-threading
• Optimized Head Design: Undercut flat head profile allows for flush mounting while maximizing sealing surface contact
• Industry-Compliant Manufacturing: Meets RoHS 3 and REACH regulations for safe use in regulated industrial environments
• Versatile Drive Compatibility: Phillips No. 1 drive enables efficient installation with standard industrial tools

Professional Applications & Engineering Value

These 4-40 UNC flat head Phillips screws with integrated silicone O-rings solve critical sealing challenges in demanding industrial applications. The combination of 18-8 stainless steel construction and passivated finish ensures long-term corrosion resistance in harsh environments, while the undercut flat head design provides optimal sealing surface contact. Engineered for hydraulic systems, pneumatic equipment, and fluid handling applications, these fully threaded fasteners deliver reliable performance where pressure integrity is paramount. The coarse UNC threading with Class 2A fit enables quick installation and secure fastening, making them ideal for assembly lines requiring both speed and sealing reliability. Their ability to withstand extreme temperature fluctuations from -80° to 400° F makes them suitable for automotive, aerospace, and industrial machinery applications where thermal cycling is common.

Specification Summary & Compliance

This 4-40 UNC flat head screw features precise Class 2A thread fit with coarse threading and full threading along the 5/8" length. Manufactured from 18-8 stainless steel with passivated finish for enhanced corrosion protection. The screw incorporates a silicone rubber O-ring rated for -80° to 400° F temperature range and maximum pressure of 6000 psi. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial applications requiring reliable sealing solutions.