S-95198A445 4-40 x 5/16" 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 that maintains integrity across extreme temperature ranges from -20° to 400° F
• Exceptional pressure resistance handling up to 1500 psi for demanding hydraulic and pneumatic applications
• High-strength construction with 18-8 stainless steel providing 100,000 psi tensile strength and corrosion resistance
• Precision thread engagement with Class 3A UNC coarse threads ensuring reliable fastening in high-vibration environments
• Optimized drive efficiency through standard hex socket design with 3/32" drive for secure installation and removal
• Industry-standard compliance meeting ASME B18.3, DIN 912, and ISO 4762 specifications for global acceptance
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

This 4-40 UNC thread socket head cap screw with Viton® O-ring technology addresses critical sealing challenges in high-pressure industrial systems. The 18-8 stainless steel construction combined with Class 3A thread fit provides exceptional resistance to vibration loosening and environmental degradation. Engineered for applications requiring reliable sealing performance under extreme conditions, this fastener is ideal for hydraulic manifolds, pneumatic cylinders, and processing equipment where temperature fluctuations and pressure variations would compromise standard fasteners. The fully threaded design ensures consistent clamping force distribution while the coarse UNC thread facilitates quick assembly in production environments.

Specification Summary & Compliance

This socket head cap screw features precise 4-40 UNC coarse threads with Class 3A fit for superior thread engagement. Manufactured to ASME B18.3, DIN 912, and ISO 4762 standards, ensuring dimensional accuracy and interchangeability. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for use in regulated industries worldwide. With a maximum hole diameter of 0.127" and fully threaded 5/16" length, this screw delivers reliable performance in precision applications.