S-90402A703 M3 x 8 mm ASME B18.13.1M Steel Pan Head Phillips Screws with External-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated external-tooth lock washer that maintains secure fastening in high-motion environments
• Enhanced durability and corrosion protection through zinc-plated steel construction, extending service life in industrial settings
• Reliable torque transmission with Phillips No. 1 drive design for efficient installation and reduced cam-out risk
• Consistent thread engagement thanks to Class 6g coarse threading and fully threaded design for maximum grip strength
• High mechanical strength with 60,000 psi tensile strength and Rockwell B73 hardness for demanding applications
• Secure rounded pan head profile providing a low-profile, flush finish while distributing clamping force effectively
• Immediate compliance readiness meeting ASME B18.13.1M, RoHS 3, and REACH standards for global market acceptance

Professional Applications & Engineering Value

These M3 metric screws with zinc-plated steel construction and integrated external-tooth lock washer address critical vibration-induced loosening in industrial machinery, electronic enclosures, and automotive assemblies. The coarse thread design (0.5mm pitch) ensures rapid installation and reliable performance in materials where fine threads might strip, while the fully threaded configuration provides maximum thread engagement along the entire 8mm length. The Phillips drive system offers familiar, efficient installation with standard tools, reducing assembly time in production environments. The combination of 60,000 psi tensile strength and Rockwell B73 hardness ensures these rounded head screws maintain integrity under mechanical stress, making them ideal for applications requiring repeated disassembly and reassembly without performance degradation.

Specification Summary & Compliance

This M3 x 0.5mm x 8mm screw features Class 6g thread fit tolerance for precise engagement and complies with ASME B18.13.1M manufacturing specifications. The external-tooth lock washer (5.84mm OD, 0.45mm thickness) provides positive locking action, while the zinc-plated steel construction ensures corrosion resistance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting international standards for hazardous substance restrictions.