S-90317A110 M3 x 4 mm ASME B18.13.1M Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance with an integrated internal-tooth lock washer that maintains clamp load in high-motion environments
• Excellent corrosion resistance provided by 18-8 stainless steel construction and a passivated finish for long service life
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Reliable fastening performance ensured by Class 6g thread fit and coarse M3 x 0.5mm threading for quick assembly
• Secure Phillips drive engagement with No. 1 drive size preventing cam-out during installation
• Full thread coverage along the 4mm length for maximum grip and load distribution
• Regulatory compliance meeting ASME B18.13.1M standards and environmental regulations for global industrial use

Professional Applications & Engineering Value

These M3 metric screws with internal-tooth lock washers provide critical vibration resistance in industrial machinery, electronic enclosures, and automotive assemblies where loosening under dynamic loads can cause equipment failure. The 18-8 stainless steel construction combined with passivated finish offers exceptional corrosion protection in harsh environments, while the fully threaded design ensures maximum engagement in thin materials. The coarse thread pitch (0.5mm) enables rapid installation without cross-threading, and the pan head profile with Phillips drive provides flush mounting with secure tool engagement. These engineering features make them ideal for applications requiring reliable, maintenance-free fastening solutions that withstand continuous vibration and environmental exposure.

Specification Summary & Compliance

This M3 x 0.5mm x 4mm screw features Class 6g thread tolerance for precision fit and is manufactured according to ASME B18.13.1M specifications. The assembly includes an internal-tooth lock washer (6.68mm OD, 0.43mm thickness) made from 410 stainless steel with passivated finish. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and global market acceptance for industrial applications.