S-95198A513 1/4"-28 x 3/8" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated Viton® fluoroelastomer O-ring ensures a reliable seal in high-pressure environments up to 1500 psi, preventing leaks and contamination.
• Exceptional Corrosion Resistance: Made from 18-8 Stainless Steel, offering excellent resistance to rust and corrosion, ideal for harsh industrial settings.
• High Tensile Strength & Durability: With a 100,000 psi tensile strength and Rockwell B85 hardness, these screws provide long-lasting, secure fastening under heavy loads.
• Precision Thread Fit: Class 3A fine UNF threads ensure a tight, vibration-resistant fit, reducing the risk of loosening in dynamic applications.
• Wide Temperature Tolerance: The Viton® O-ring operates effectively from -20° to 400° F, making it suitable for applications with extreme temperature fluctuations.
• Easy Installation & High Torque Capability: The hex socket drive (3/16") allows for efficient installation with standard tools and provides high torque transfer without stripping.
• Full Thread Engagement: Fully threaded design maximizes grip and load distribution along the entire length for enhanced joint integrity.

Professional Applications & Engineering Value

This socket head cap screw is engineered to solve critical sealing and fastening challenges in demanding industrial environments. The combination of 18-8 stainless steel and a Viton® fluoroelastomer O-ring provides a robust solution for applications where fluid or gas containment is essential, such as in hydraulic systems, pneumatic equipment, and high-pressure pumps. The fine UNF thread (1/4"-28) and Class 3A fit offer superior resistance to vibration loosening, ensuring maintained clamp force in machinery subject to dynamic stresses. Its fully threaded construction and high tensile strength make it ideal for securing components in automotive, aerospace, and manufacturing assemblies, where reliability under high pressure (1500 psi) and variable temperatures is paramount. This screw delivers consistent performance, reducing maintenance needs and downtime.

Specification Summary & Compliance

This screw features precise Class 3A thread fit per UNF standards, ensuring dimensional accuracy and interchangeability. It is manufactured in compliance with ASME B18.3, DIN 912, and ISO 4762 specifications, guaranteeing consistency and reliability. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for use in global markets.