S-95198A339 1/4"-20 x 1 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 O-ring provides reliable leak-proof sealing up to 1500 psi, ideal for hydraulic and pneumatic systems.
• Exceptional Corrosion Resistance: Made from 18-8 stainless steel, offering excellent durability in harsh environments and moisture-prone applications.
• High Tensile Strength: 100,000 psi tensile strength ensures reliable load-bearing capacity for heavy-duty mechanical assemblies.
• Precision Thread Fit: Class 3A UNC coarse threads deliver secure, vibration-resistant fastening with minimal risk of loosening.
• Wide Temperature Tolerance: O-ring maintains sealing integrity across a broad range from -40°F to 225°F, suitable for extreme operating conditions.
• Standard Socket Drive Compatibility: 3/16" hex drive allows for easy installation with common tools, reducing assembly time and effort.
• Full Thread Engagement: Fully threaded design maximizes grip length and distributes stress evenly for enhanced joint stability.

Professional Applications & Engineering Value

This Socket Head Cap Screw is engineered to address critical sealing and strength challenges in industrial applications. The 18-8 stainless steel construction provides inherent corrosion resistance, making it suitable for outdoor, marine, and chemical processing equipment where moisture and corrosive agents are present. The integrated Buna-N rubber O-ring ensures a tight seal against fluids and gases, preventing leaks in pressurized systems up to 1500 psi. With a Class 3A thread fit and UNC coarse threads, it offers quick assembly and high resistance to vibration loosening in machinery, automotive components, and precision instruments. The combination of 100,000 psi tensile strength and Rockwell B85 hardness ensures long-term reliability under dynamic loads, reducing maintenance needs and downtime.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread size with Class 3A precision fit and coarse thread spacing for optimal engagement. It complies with ASME B18.3, DIN 912, and ISO 4762 standards, ensuring dimensional accuracy and interchangeability. The product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for global industrial use.