S-95198A504 1/4"-20 x 1/2" 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 reliable sealing in high-pressure applications up to 1500 psi, preventing leaks in critical assemblies.
• Exceptional Temperature Resistance: O-ring maintains integrity across a broad temperature range from -20°F to 400°F, ideal for environments with thermal fluctuations.
• High Tensile Strength & Durability: 18-8 Stainless Steel construction provides 100,000 psi tensile strength and Rockwell B85 hardness for long-lasting, corrosion-resistant performance.
• Precision Thread Fit: Class 3A UNC coarse threads offer superior engagement and vibration resistance, ensuring secure fastening in demanding conditions.
• Standardized Socket Drive: 3/16" hex drive with standard socket head profile allows for easy installation and high torque application with common tools.
• Full Thread Engagement: Fully threaded design maximizes grip and load distribution along the entire 1/2" length for enhanced structural integrity.
• Broad Industrial Compliance: Meets ASME B18.3, DIN 912, and ISO 4762 standards, ensuring interchangeability and reliability in global applications.

Professional Applications & Engineering Value

This socket head cap screw is engineered to address critical sealing and mechanical fastening challenges in industrial settings. The 18-8 stainless steel material provides excellent corrosion resistance, making it suitable for harsh environments, including chemical processing and marine applications. The Viton® O-ring is specifically selected for its ability to withstand extreme temperatures and high pressure, effectively preventing fluid or gas leaks in hydraulic systems, pumps, and compressed air equipment. The Class 3A UNC coarse thread ensures quick assembly and high resistance to loosening under vibration, which is essential in machinery and automotive assemblies. Fully threaded for maximum holding power, this screw delivers reliable performance in high-pressure sealing applications where failure is not an option, reducing maintenance needs and downtime.

Specification Summary & Compliance

This screw features precise Class 3A thread fit with UNC coarse threads (1/4"-20) and a length of 1/2", manufactured to ASME B18.3, DIN 912, and ISO 4762 specifications for dimensional accuracy and performance. 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 industrial and international markets.