S-90042A179 M4 x 40 mm ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ensuring long-term reliability in harsh environments.
• High-pressure sealing capability up to 1500 psi, thanks to the integrated silicone rubber O-ring that prevents leaks in critical applications.
• Wide temperature tolerance from -80° to 400° F, maintaining performance and seal integrity under extreme thermal conditions.
• Exceptional tensile strength of 100,000 psi and Rockwell B85 hardness, providing durable, high-load fastening for demanding industrial use.
• Precision Class 6g thread fit and coarse M4 x 0.7mm thread, enabling easy installation and secure, vibration-resistant connections.
• Partially threaded design with a 24 mm minimum thread length, offering optimal grip and alignment in assemblies without unnecessary threading.
• Compliance with major standards including ASME B18.3, DIN 912, and ISO 4762, ensuring interchangeability and quality assurance for global projects.

Professional Applications & Engineering Value

This M4 socket head cap screw is engineered to address common industrial challenges such as fluid leakage, vibration loosening, and material degradation. The 18-8 stainless steel provides excellent resistance to corrosion and oxidation, making it ideal for applications in chemical processing, marine equipment, and outdoor machinery. The silicone rubber O-ring creates a reliable seal against high-pressure fluids and gases, preventing system failures in hydraulic or pneumatic setups. With a partially threaded shank and Class 6g thread precision, it ensures quick, accurate installation in tight spaces, reducing assembly time and minimizing the risk of cross-threading. These features make it a top choice for sealing critical joints in automotive, aerospace, and manufacturing sectors where durability and leak-proof performance are paramount.

Specification Summary & Compliance

The screw features a metric thread with M4 x 0.7mm coarse pitch and Class 6g thread fit for precise dimensional accuracy. It is manufactured in accordance with ASME B18.3, DIN 912, and ISO 4762 standards, ensuring consistent quality and compatibility. Additionally, it is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for use in various industrial markets.