S-90608A303 4-40 x 3/8" 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 industrial environments and extended service life.
• Reliable high-pressure sealing up to 1500 psi, preventing leaks in critical fluid and gas systems with the integrated Buna-N O-Ring.
• Wide temperature tolerance from -40° to 225°F, ensuring consistent performance and seal integrity in fluctuating operational conditions.
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B85 hardness, providing high clamp load and resistance to stripping or shear.
• Precise Class 3A thread fit for secure, vibration-resistant assemblies and easier installation in demanding applications.
• Convenient installation and removal using a standard 3/32" hex key, allowing for efficient maintenance in confined spaces.
• Global compliance and interoperability, meeting ASME B18.3, DIN 912, and ISO 4762 standards for reliable sourcing and replacement.

Professional Applications & Engineering Value

This 316 Stainless Steel Socket Head Cap Screw is engineered to address common failure points in high-pressure sealing applications, such as hydraulic systems, pneumatic controls, and fluid processing equipment. The Buna-N O-Ring seal is integrally designed to maintain a tight barrier against leaks, even under dynamic pressure cycles and temperature swings from -40° to 225°F. Its fully threaded UNC coarse thread and Class 3A fit ensure uniform stress distribution and reduce the risk of loosening under vibration, while the corrosion-resistant 316 Stainless Steel material prevents degradation in corrosive or outdoor settings. This combination makes it a dependable choice for OEMs and maintenance teams needing durable, leak-proof fastening in machinery, valves, and industrial assemblies.

Specification Summary & Compliance

This fastener adheres to Class 3A thread tolerance for precise fit, with UNC coarse threads (4-40) and a right-hand thread direction. It conforms to ASME B18.3, DIN 912, and ISO 4762 manufacturing specifications, ensuring dimensional accuracy and interchangeability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.