S-98070A142 4-40 x 5/8" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Reliable sealing performance with a Buna-N rubber O-ring that withstands pressures up to 1500 psi and temperatures from -40° to 225°F, ideal for harsh environments.
• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ensuring long-term durability in industrial settings.
• Precise thread engagement with Class 2A thread fit and UNC coarse threads, providing secure fastening and reduced risk of cross-threading.
• Efficient installation via Phillips No. 1 drive and undercut flat head design, allowing for flush mounting and easy torque application.
• Full threading along the 5/8" length ensures consistent grip and uniform load distribution in assemblies.
• Compliance with environmental standards, including RoHS 3 and REACH, making it suitable for regulated industries.
• Versatile application with a 100° countersink angle, enabling optimal seating in various materials up to a maximum hole diameter of 0.129".

Professional Applications & Engineering Value

This 4-40 UNC flat head Phillips screw is engineered to address critical sealing challenges in industrial and engineering environments. Constructed from 18-8 stainless steel with a passivated finish, it offers excellent resistance to corrosion and oxidation, extending service life in moist or chemically aggressive settings. The inclusion of a Buna-N rubber O-ring ensures a reliable seal against fluids and gases, capable of handling pressures up to 1500 psi, which is vital for applications in hydraulic systems, automotive assemblies, and electronic enclosures. The undercut flat head profile and coarse thread spacing facilitate quick, secure installations while maintaining a low-profile appearance. Ideal for use in machinery, plumbing, and aerospace components, this screw provides a robust solution for preventing leaks and maintaining structural integrity under varying thermal conditions from -40° to 225°F.

Specification Summary & Compliance

This screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy and compatibility. It is fully threaded and features a right-hand thread direction with coarse spacing for efficient fastening. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial markets. Manufactured to meet high-performance demands, it supports applications requiring a maximum hole diameter of 0.129" and a countersink angle of 100°.