S-95198A505 1/4"-20 x 5/8" 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 from -20° to 400°F, preventing leaks in extreme thermal cycling environments.
• Exceptional corrosion resistance from 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial and outdoor applications.
• High tensile strength of 100,000 psi provides reliable fastening under heavy mechanical loads, reducing the risk of fastener failure.
• Precision Class 3A thread fit ensures smooth assembly and secure engagement with mating components, minimizing cross-threading and rework.
• Pressure resistance up to 1500 psi makes these screws ideal for hydraulic, pneumatic, and high-pressure fluid systems requiring dependable sealing.
• Standard hex socket drive allows for high torque application with common tools, facilitating quick installation and maintenance.
• Multi-standard compliance including ASME B18.3, ISO 4762, and DIN 912 guarantees interchangeability and global engineering acceptance.

Professional Applications & Engineering Value

These socket head cap screws with Viton® sealing are engineered to address critical challenges in industrial applications where fluid containment and environmental resistance are paramount. The 18-8 stainless steel material provides excellent corrosion resistance, while the integrated fluoroelastomer O-ring creates a reliable seal against oils, chemicals, and extreme temperatures from -20° to 400°F. The UNC coarse thread with Class 3A fit ensures precise engagement in threaded holes, reducing installation time and preventing galling. Ideal for high-pressure systems up to 1500 psi, these sealed socket screws deliver consistent performance in hydraulic equipment, pneumatic cylinders, processing machinery, and automotive assemblies where vibration resistance and leak prevention are critical.

Specification Summary & Compliance

This 1/4"-20 x 5/8" socket head cap screw features Class 3A thread fit with UNC coarse threads and right-hand direction. Manufacturing complies with ASME B18.3, ISO 4762, and DIN 912 standards for dimensional accuracy and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for hazardous substances. Additional specifications include a 3/16" hex drive, 3/8" head diameter, and fully threaded design for consistent fastening performance.