S-90042A261 M4 x 40 mm ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with integrated Buna-N rubber O-ring to prevent fluid and gas leaks under pressures up to 1500 psi
• Exceptional corrosion resistance due to 18-8 stainless steel construction, ideal for harsh or humid industrial environments
• High mechanical strength with 100,000 psi tensile strength and Rockwell B85 hardness for reliable load-bearing in demanding applications
• Precise Class 6g thread fit ensures smooth assembly and secure fastening with metric coarse (0.7mm pitch) threading
• Wide temperature tolerance from -40° to 225° F, maintaining seal integrity and fastener performance across varied operating conditions
• Secure hex socket drive (3mm) allows high torque application without slippage, reducing installation time and tool wear
• Partial threading design provides unthreaded shank for precise clamping and alignment in assembled components

Professional Applications & Engineering Value

Engineered for critical sealing applications, this M4 socket head cap screw solves common industrial challenges where fluid containment and vibration resistance are paramount. The 18-8 stainless steel body resists chemical exposure and oxidation, while the Buna-N rubber O-ring creates a reliable seal in hydraulic systems, pneumatic equipment, and machinery subjected to pressure fluctuations up to 1500 psi. The partially threaded configuration ensures maximum grip strength when securing housings, pumps, or fluid power components, preventing joint failure. With metric coarse threading (0.7mm pitch) and Class 6g tolerance, these screws enable rapid assembly in automotive, manufacturing, and processing equipment—reducing maintenance downtime and improving operational safety.

Specification Summary & Compliance

This socket head cap screw meets dimensional requirements per ASME B18.3, DIN 912, and ISO 4762 standards, with Class 6g thread fit ensuring interchangeability and precision. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material traceability. The screw features a 3mm hex drive, 7mm head diameter, and 40mm total length with 24mm minimum thread length, designed for maximum hole diameter of 4.546mm in sealed assemblies.