S-98070A133 2-56 x 1/4" 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 critical applications.
• Excellent corrosion resistance due to 18-8 stainless steel construction and passivated finish, ensuring long-term durability in harsh environments.
• Reliable thread engagement with Class 2A thread fit and UNC coarse threading, providing secure fastening and vibration resistance.
• Flush mounting capability with flat undercut head design and 82° countersink angle, allowing for a smooth surface finish and reduced protrusion.
• Efficient installation using Phillips No. 1 drive, enabling quick and straightforward assembly with standard tools.
• Full threading along the 1/4" length ensures maximum grip and uniform stress distribution, enhancing joint integrity.
• Compliance with environmental standards including RoHS 3 and REACH, making it suitable for regulated industrial sectors.

Professional Applications & Engineering Value

This 2-56 UNC flat head Phillips screw is engineered to address common challenges in industrial sealing and fastening. Made from 18-8 stainless steel with a passivated finish, it resists corrosion and oxidation, ideal for environments exposed to moisture or chemicals. The integrated Buna-N rubber O-ring provides a reliable seal against fluids and gases, capable of withstanding pressures up to 1500 psi and temperatures from -40° to 225°F. Its flat undercut head and coarse UNC threads ensure a secure, flush fit in applications like machinery, automotive assemblies, and electronic enclosures, reducing maintenance needs and improving operational safety. This design is perfect for industrial fasteners requiring consistent performance under demanding conditions.

Specification Summary & Compliance

The screw features precise Class 2A thread fit with UNC coarse thread spacing and full threading for accurate installation. It adheres to standard dimensions, including a head diameter of 0.172" and length of 1/4", with an 82° countersink angle for optimal seating. Compliance is confirmed with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for industrial use.