S-98070A177 1/4"-20 x 3/8" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with integrated Buna-N rubber O-ring, rated for pressures up to 1500 psi and temperatures from -40° to 225°F, preventing leaks in demanding environments
• Exceptional corrosion resistance thanks to 18-8 Stainless Steel construction and passivated finish, ensuring long-term reliability in harsh or moist conditions
• High tensile strength of 70,000 psi provides reliable fastening integrity under mechanical stress, reducing the risk of fastener failure
• Precise Class 2A thread fit with UNC coarse threading ensures easy installation and secure engagement, minimizing cross-threading and assembly time
• Undercut flat head design allows for flush mounting and improved aesthetics, while the Phillips No. 3 drive offers common tool compatibility
• Full threading along the 3/8" length enables consistent grip and adjustment flexibility across the entire fastener
• Compliance with RoHS 3 and REACH regulations guarantees environmental safety and meets international standards for industrial use

Professional Applications & Engineering Value

This 1/4"-20 UNC Flat Head Phillips Sealing Screw is engineered to address critical sealing and corrosion challenges in industrial assemblies. The combination of 18-8 Stainless Steel and a passivated finish provides robust resistance to oxidation and chemical exposure, making it ideal for applications in machinery, fluid handling systems, and outdoor equipment. The integrated Buna-N rubber O-ring creates a reliable seal against high-pressure fluids and gases, preventing leaks that can lead to system failures or contamination. Its undercut flat head and Phillips drive facilitate quick, flush installations in countersunk holes, while the coarse UNC threads ensure strong holding power in various materials. This screw is a trusted solution for engineers seeking durability, regulatory compliance, and performance in demanding environments.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with Class 2A fit for precise dimensional accuracy and ease of assembly. It is fully threaded and manufactured from 18-8 Stainless Steel with a passivated surface treatment. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial fastener applications.