S-95198A351 5/16"-18 x 1/2" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated Buna-N rubber O-ring ensures reliable leak-proof sealing in demanding applications, preventing fluid or gas ingress.
• High Tensile Strength: With 100,000 psi tensile strength, this screw provides exceptional load-bearing capacity and resistance to mechanical stress in heavy-duty assemblies.
• Wide Temperature Resilience: O-ring functions effectively from -40° to 225°F, maintaining seal integrity across extreme industrial temperature ranges.
• Precision Thread Fit: Class 3A thread ensures tight, accurate engagement with mating parts, reducing the risk of loosening under vibration or pressure.
• Corrosion-Resistant Material: 18-8 Stainless Steel construction offers excellent resistance to rust and corrosion, extending service life in harsh environments.
• High-Pressure Capability: Withstands up to 1500 psi maximum pressure, ideal for hydraulic, pneumatic, and other high-pressure sealing systems.
• Secure Hex Drive Design: 1/4" hex drive allows for high-torque installation with standard tools, ensuring firm seating and easy maintenance.

Professional Applications & Engineering Value

This 5/16"-18 UNC Socket Head Cap Screw is engineered to address critical sealing challenges in industrial settings where fluid containment and pressure integrity are paramount. The Buna-N rubber O-ring integrated into the 18-8 Stainless Steel body creates a dependable seal that prevents leaks in applications such as hydraulic systems, compressors, and fluid handling equipment. Its coarse UNC thread and Class 3A fit provide precise, secure fastening that resists vibration-induced loosening, while the hex drive socket enables efficient installation in confined spaces. Ideal for machinery, automotive assemblies, and processing plants, this screw ensures long-term reliability by combining high tensile strength with temperature-resistant sealing, reducing maintenance needs and downtime in demanding operational environments.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with Class 3A precision fit for accurate thread engagement, and is manufactured to meet ASME B18.3, DIN 912, and ISO 4762 standards, ensuring dimensional consistency and interchangeability. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety requirements for industrial use.