S-95198A342 1/4"-28 x 3/8" 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, preventing leaks in pressurized systems up to 1500 psi.
• Exceptional Corrosion Resistance: Made from 18-8 Stainless Steel, offering excellent durability and resistance to rust in harsh environments.
• High-Strength Fastening: With a tensile strength of 100,000 psi and Rockwell B85 hardness, it ensures a secure, long-lasting hold under high stress.
• Precision Thread Fit: Class 3A UNF fine threads provide a tighter, more vibration-resistant connection for critical assemblies.
• Wide Temperature Compatibility: O-ring functions effectively from -40°F to 225°F, suitable for diverse operational conditions.
• Easy Installation with Hex Drive: Standard socket head with 3/16" hex drive allows for simple, high-torque installation in confined spaces.
• Full Thread Engagement: Fully threaded design maximizes grip and distributes load evenly along the entire 3/8" length.

Professional Applications & Engineering Value

This Socket Head Cap Screw is engineered to address critical challenges in precision industrial applications where leakage and component failure are major concerns. The combination of 18-8 Stainless Steel and a Buna-N rubber O-ring provides a robust sealing solution that withstands pressures up to 1500 psi, making it ideal for hydraulic systems, pneumatic equipment, and fluid handling assemblies. The Class 3A UNF fine thread ensures a precise, vibration-resistant fit, reducing the risk of loosening in dynamic environments. Its fully threaded design and high tensile strength offer reliable performance in machinery, automotive, and aerospace sectors, where durability and sealing integrity are paramount for operational safety and efficiency.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF fine thread with a Class 3A fit for high precision and strength. It complies with ASME B18.3, DIN 912, and ISO 4762 standards, ensuring consistent quality and interchangeability. The product is also RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for hazardous substances.