S-90042A240 M3 x 25 mm ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Integrated Buna-N rubber O-ring ensures reliable leak-proof sealing in high-pressure environments up to 1500 psi, preventing fluid and gas ingress.
• Exceptional Corrosion Resistance: Made from 18-8 Stainless Steel, offering excellent durability against rust and chemical exposure in harsh industrial conditions.
• High Tensile Strength & Durability: Withstands 100,000 psi tensile stress and Rockwell B85 hardness for long-lasting, vibration-resistant fastening in heavy-duty applications.
• Precision Thread Fit & Easy Installation: Class 6g thread tolerance and 2.5 mm hex drive enable quick, accurate assembly with standard tools, reducing installation time.
• Wide Temperature Compatibility: O-ring functions reliably from -40° to 225° F, maintaining seal integrity in extreme thermal cycling environments.
• Global Standard Compliance: Meets ASME B18.3, DIN 912, and ISO 4762 specifications, ensuring interchangeability and quality assurance for international projects.
• Environmental & Regulatory Safety: RoHS 3 and REACH compliant, providing safe, sustainable fastening solutions without hazardous substances.

Professional Applications & Engineering Value

This M3 socket head cap screw with Buna-N rubber O-ring addresses critical sealing challenges in industrial equipment, hydraulic systems, and precision machinery. The 18-8 Stainless Steel construction resists corrosion from moisture, chemicals, and outdoor exposure, while the coarse thread (0.5 mm pitch) and partial threading enhance grip and reduce cross-threading risks. Engineers benefit from its ability to maintain 1500 psi pressure ratings in dynamic applications, such as pneumatic controls and fluid handling assemblies, where leak prevention is paramount. The hex socket drive allows for high-torque installation in confined spaces, streamlining maintenance and improving operational reliability in demanding sectors like automotive, aerospace, and manufacturing.

Specification Summary & Compliance

This metric socket head cap screw features M3 x 0.5 mm coarse threads with Class 6g tolerance for precise fit, a partially threaded design with 18 mm minimum thread length, and a 25 mm overall length. It conforms to ASME B18.3, DIN 912, and ISO 4762 manufacturing standards, ensuring dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and regulatory adherence for global supply chains.