S-90608A302 4-40 x 5/16" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh chemical and marine environments.
• Reliable high-pressure sealing up to 1500 psi, thanks to the integrated Buna-N rubber O-ring that prevents leaks in critical applications.
• Exceptional tensile strength of 100,000 psi ensures durability and load-bearing capability in demanding mechanical assemblies.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant fastening in precision equipment.
• Wide temperature tolerance from -40° to 225°F, maintaining performance and seal integrity in extreme operating conditions.
• Easy installation and removal with a standard hex drive (3/32"), allowing for efficient assembly with common tools.
• Full regulatory compliance with ASME B18.3, DIN 912, ISO 4762, RoHS 3, and REACH, ensuring safety and international acceptance.

Professional Applications & Engineering Value

This 316 Stainless Steel Socket Head Cap Screw is engineered to address common industrial challenges such as fluid leakage, corrosion, and mechanical failure in high-stress environments. The Buna-N rubber O-ring provides an effective seal against liquids and gases, making it ideal for pneumatic systems, hydraulic assemblies, and precision machinery where pressure integrity is critical. The coarse UNC thread and Class 3A fit ensure quick, secure installation with minimal risk of cross-threading, while the fully threaded design offers consistent clamping force. Its Rockwell B85 hardness and high tensile strength resist wear and deformation, extending service life in applications like automotive, aerospace, and chemical processing equipment.

Specification Summary & Compliance

This screw features a 4-40 UNC thread with Class 3A fit for precise dimensional accuracy, and is manufactured in accordance with ASME B18.3, DIN 912, and ISO 4762 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.