S-95198A503 1/4"-20 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 creates a reliable seal capable of withstanding pressures up to 1500 psi and a wide temperature range from -20° to 400° F, preventing leaks in demanding environments.
• Exceptional Corrosion Resistance: Manufactured from 18-8 Stainless Steel, this screw offers excellent resistance to rust and corrosion, ensuring long-term durability and reliability in harsh conditions.
• High Tensile Strength & Durability: With a 100,000 psi tensile strength and Rockwell B85 hardness, this fastener provides robust mechanical performance and resistance to wear and deformation under high stress.
• Precision Thread Fit for Secure Fastening: Features a Class 3A UNC coarse thread, ensuring a tight, secure fit with excellent vibration resistance and ease of assembly in various industrial applications.
• Reliable Drive & Installation: The standard hex socket head with a 3/16" drive size allows for high torque application and secure installation in confined spaces, reducing the risk of stripping.
• Full Thread Engagement: Being fully threaded along its 3/8" length, it provides maximum grip and holding power across the entire engagement area.
• Global Standards Compliance: Meets ASME B18.3, DIN 912, and ISO 4762 specifications, ensuring dimensional accuracy, interchangeability, and quality assurance for global engineering projects.

Professional Applications & Engineering Value

This Socket Head Cap Screw is engineered to solve critical sealing and fastening challenges in high-pressure and temperature-sensitive environments. The core of its value lies in the combination of 18-8 Stainless Steel for corrosion resistance and the Viton® O-Ring, which together create a durable seal against fluids and gases. This makes it ideal for applications in hydraulic systems, pneumatic equipment, automotive assemblies, and processing machinery where leak prevention is paramount. The Class 3A UNC coarse thread ensures a precise, vibration-resistant fit, reducing maintenance needs and downtime. Its compact socket head design with a hex drive facilitates installation in tight spaces, enhancing assembly efficiency. Fully compliant with major international standards, this screw delivers reliable performance and longevity, making it a trusted component for industrial fastening solutions that demand both mechanical strength and environmental sealing.

Specification Summary & Compliance

This screw adheres to strict dimensional tolerances as per ASME B18.3, DIN 912, and ISO 4762 standards, with a precise Class 3A thread fit for the 1/4"-20 UNC coarse thread. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in various industries. The manufacturing process follows these specifications to guarantee consistency, reliability, and performance in professional applications.