S-95198A411 1/2"-20 x 1 1/4" 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 creates a reliable seal against fluids and gases, preventing leaks in pressurized systems up to 1500 psi.
• Exceptional Corrosion Resistance: 18-8 stainless steel construction ensures long-term durability and performance in harsh, corrosive environments.
• High-Strength Reliability: With a tensile strength of 100,000 psi and Rockwell B85 hardness, this screw withstands extreme mechanical stresses and vibrations.
• Precision Thread Fit: Class 3A thread fit provides tighter tolerances for secure, vibration-resistant fastening in critical assemblies.
• Wide Temperature Tolerance: O-ring maintains sealing integrity across a broad temperature range from -40° to 225° F, suitable for diverse operating conditions.
• Optimized Drive Engagement: 3/8" hex socket drive allows for high-torque installation and a clean, low-profile head design.
• Broad Industry Compliance: Meets ASME B18.3, DIN 912, and ISO 4762 standards, ensuring interchangeability and quality for global engineering projects.

Professional Applications & Engineering Value

This 1/2"-20 UNF socket head cap screw is engineered to solve critical sealing and integrity challenges in high-pressure and precision industrial applications. The combination of 18-8 stainless steel and a Buna-N rubber O-ring provides a robust sealing solution that prevents fluid and gas leaks in hydraulic systems, pneumatic cylinders, and pump housings. The fine UNF thread and Class 3A fit offer superior resistance to loosening under vibration, making it ideal for machinery, automotive assemblies, and processing equipment where reliability is non-negotiable. Its fully threaded design ensures maximum grip and clamp load distribution, while the socket head allows for easy installation in confined spaces, delivering long-term performance and reducing maintenance downtime.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and a 1/2"-20 UNF fine thread. It is manufactured in compliance with ASME B18.3, DIN 912, and ISO 4762 specifications. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for use in various international markets.