S-95198A132 4-40 x 3/4" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated silicone rubber O-ring ensures reliable sealing up to 1500 psi, preventing leaks in high-pressure applications.
• Exceptional Corrosion Resistance: Made from 18-8 Stainless Steel, offering excellent durability in harsh environments and extended service life.
• High Tensile Strength: Withstands up to 100,000 psi tensile load, providing robust fastening for demanding mechanical assemblies.
• Wide Temperature Tolerance: O-ring functions reliably from -80° to 400°F, maintaining seal integrity under extreme thermal conditions.
• Precision Thread Fit: Class 3A UNC coarse threads ensure tight, secure engagement and reduce the risk of cross-threading during installation.
• Easy Installation & Accessibility: Hex socket drive (3/32") allows for straightforward tightening in confined spaces with standard tools.
• Full Thread Engagement: Fully threaded design maximizes grip and distribution of clamping force along the entire screw length.

Professional Applications & Engineering Value

This 4-40 UNC Thread Socket Head Cap Screw is engineered to address critical sealing and durability challenges in industrial settings. The 18-8 Stainless Steel construction resists corrosion, making it ideal for use in chemical processing, marine, and outdoor equipment where moisture and corrosive agents are present. The inclusion of a silicone rubber O-ring provides a dependable seal against fluids and gases, crucial in hydraulic systems, pneumatic controls, and pressurized enclosures rated up to 1500 psi. Its Class 3A thread fit and coarse UNC thread design ensure quick assembly and high vibration resistance, reducing maintenance needs in machinery, automotive components, and heavy-duty fastening applications. By combining material resilience with precision engineering, this screw minimizes downtime and enhances the reliability of your assemblies.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 3A precision fit, ensuring dimensional accuracy and consistent performance. It is manufactured in compliance with ASME B18.3, DIN 912, and ISO 4762 standards, guaranteeing interchangeability and quality. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances.