S-95198A345 1/4"-28 x 3/4" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated Buna-N O-ring provides reliable leak prevention under pressures up to 1500 psi, ideal for hydraulic and pneumatic systems.
• Exceptional Corrosion Resistance: Made from 18-8 stainless steel for excellent durability in harsh environments and extended service life.
• High Tensile Strength: Withstands 100,000 psi tensile loads, ensuring secure fastening in high-stress applications.
• Precision Thread Fit: Class 3A fine thread (UNF 1/4"-28) offers tighter tolerances and improved vibration resistance compared to standard threads.
• Wide Temperature Compatibility: O-ring maintains sealing integrity across a broad -40° to 225° F temperature range.
• Optimized Drive Design: Hex socket head with 3/16" drive allows for high torque application and secure installation in confined spaces.
• Industry Standard Compliance: Manufactured to ASME B18.3, DIN 912, and ISO 4762 specifications for guaranteed interchangeability and quality.

Professional Applications & Engineering Value

This socket head cap screw delivers critical sealing solutions for industrial equipment where fluid containment is paramount. The 18-8 stainless steel construction provides inherent corrosion resistance, making it suitable for marine, chemical processing, and food processing applications. The Buna-N rubber O-ring creates a positive seal against oils, water, and many chemicals, while the fine UNF thread (1/4"-28) with Class 3A fit ensures superior clamping force and resistance to loosening under vibration. This combination directly addresses common failure points in machinery, pumps, and valve assemblies, reducing maintenance downtime and preventing costly leaks.

Specification Summary & Compliance

This fully threaded socket head cap screw features a 1/4"-28 UNF thread with a precision Class 3A thread fit and standard right-hand orientation. Manufacturing and dimensional compliance is confirmed with ASME B18.3, DIN 912, and ISO 4762 standards. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent international regulations for hazardous substances.