S-95198A585 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 with Viton® fluoroelastomer O-ring for reliable leak prevention in high-pressure and extreme temperature applications (-20° to 400°F)
• Exceptional corrosion resistance provided by 18-8 stainless steel construction, ensuring long-term durability in harsh industrial environments
• Precise thread engagement with Class 3A fine threads (UNF 1/2"-20) for secure fastening and vibration resistance in critical assemblies
• High tensile strength rated at 100,000 psi with Rockwell B85 hardness, delivering reliable performance under heavy mechanical loads
• Optimized drive efficiency through 3/8" hex socket design allowing high torque application and secure installation in confined spaces
• Maximum pressure containment capability up to 1500 psi, making it ideal for hydraulic, pneumatic, and fluid handling systems
• Full thread coverage along the 1-1/4" length provides consistent clamping force and flexibility in various material thicknesses

Professional Applications & Engineering Value

This socket head cap screw delivers critical engineering solutions where sealing integrity and structural reliability are paramount. The combination of 18-8 stainless steel material and Viton® fluoroelastomer O-ring addresses common failure points in industrial equipment exposed to chemicals, temperature fluctuations, and pressure variations. The Class 3A thread fit with UNF fine threading ensures precise alignment and prevents loosening in vibrating machinery, while the hex socket drive facilitates installation in space-constrained applications. These socket head cap screws are engineered for demanding applications in hydraulic systems, processing equipment, automotive assemblies, and precision machinery where leak-proof fastening and corrosion resistance are essential for operational safety and reduced maintenance cycles.

Specification Summary & Compliance

This fastener maintains Class 3A thread precision with UNF 1/2"-20 fine threading and complies with ASME B18.3, DIN 912, and ISO 4762 manufacturing specifications. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations, ensuring environmental safety and material transparency. With maximum hole diameter compatibility of 0.531" and full threading along the 1-1/4" length, it delivers consistent performance across industrial applications requiring standardized metric and imperial fastener solutions.