S-98070A128 1/4"-20 x 3/8" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated silicone O-ring provides reliable leak-proof sealing in demanding environments, preventing fluid and gas ingress.
• Exceptional Temperature Resistance: Withstands extreme conditions from -80° to 400° F, ensuring consistent performance in high-heat or cryogenic applications.
• High Tensile Strength & Pressure Handling: 70,000 psi tensile strength and 1500 psi maximum pressure rating deliver robust, failure-resistant fastening for critical assemblies.
• Enhanced Corrosion Resistance: 18-8 stainless steel construction with passivated finish offers excellent protection against rust and chemical degradation in harsh industrial settings.
• Precision Thread Fit & Easy Installation: Class 2A UNC coarse threads ensure smooth, accurate engagement and reduce cross-threading risks with standard Phillips No. 3 drive.
• Optimized Head Design for Flush Mounting: Undercut flat head profile allows countersunk installation up to 100° angle, providing a smooth surface finish and improved aesthetics.
• Regulatory Compliance & Material Safety: Meets RoHS 3 and REACH environmental standards, guaranteeing safe use in regulated industries without hazardous substances.

Professional Applications & Engineering Value

This 1/4"-20 UNC flat head Phillips screw with silicone O-ring sealing is engineered to address critical challenges in fluid systems, machinery, and enclosures where pressure integrity and environmental resistance are paramount. The 18-8 stainless steel material, combined with a passivated finish, ensures long-term durability against corrosion, while the fully threaded design and Class 2A thread fit provide secure, vibration-resistant fastening. Ideal for high-pressure applications such as hydraulic assemblies, pneumatic controls, and industrial equipment, this screw eliminates leaks and maintenance downtime. The undercut flat head allows seamless integration into countersunk holes, maintaining aerodynamic or flush surfaces in automotive, aerospace, and electronic housing projects where precision and reliability are non-negotiable.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with Class 2A thread fit for precise dimensional accuracy and compatibility. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability. Key specifications include a maximum hole diameter of 0.265", 100° countersink angle, and full threading for uniform load distribution.