S-95198A442 4-40 x 1/8" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with Viton® fluoroelastomer O-rings that maintain integrity under extreme pressures up to 1500 psi and temperatures from -20° to 400°F.
• Exceptional corrosion resistance provided by 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments.
• High-strength durability with 100,000 psi tensile strength and Rockwell B85 hardness for reliable performance in demanding applications.
• Precision thread engagement with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance.
• Easy installation and removal using standard 3/32" hex drive, compatible with common tools for efficient maintenance.
• Broad regulatory compliance meeting ASME B18.3, DIN 912, and ISO 4762 standards for guaranteed quality and interchangeability.
• Environmental safety assurance through RoHS 3 and REACH compliance, making them suitable for regulated industries.

Professional Applications & Engineering Value

This socket head cap screw with integrated Viton® fluoroelastomer O-ring delivers critical sealing solutions for industrial equipment facing pressure and temperature challenges. The 18-8 stainless steel construction provides excellent corrosion resistance in chemical processing, marine, and food processing applications where moisture and corrosive agents are present. The Class 3A thread fit and UNC coarse threading ensure reliable engagement in vibration-prone assemblies, while the hex drive socket head design allows for high torque application in confined spaces. These sealing fasteners are engineered to prevent fluid and gas leakage in hydraulic systems, pneumatic equipment, and pump assemblies, offering maintenance-free operation and extended service life.

Specification Summary & Compliance

This 4-40 UNC thread socket head cap screw features precision Class 3A thread fit with coarse thread spacing for optimal engagement. Manufacturing complies with ASME B18.3, DIN 912, and ISO 4762 standards ensuring dimensional accuracy and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and safety requirements for industrial use.