S-90317A711 M3 x 20 mm ASME B18.13.1M Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance through the integrated external-tooth lock washer that prevents loosening under dynamic loads
• Excellent corrosion resistance thanks to 18-8 stainless steel construction with passivated finish for harsh environments
• Reliable installation and removal with Phillips No. 1 drive that provides secure tool engagement
• Enhanced load distribution from the pan head design that reduces surface pressure and material stress
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Secure fastening performance ensured by Class 6g thread fit and fully threaded design for maximum grip length
• Industry compliance assurance meeting ASME B18.13.1M specifications for consistent quality and performance

Professional Applications & Engineering Value

This M3 pan head screw with external-tooth lock washer addresses critical industrial challenges where vibration-induced loosening compromises assembly integrity. The combination of 18-8 stainless steel material and passivated finish provides exceptional corrosion resistance for outdoor equipment, marine components, and chemical processing applications. The external-tooth lock washer creates permanent bite into mating surfaces, maintaining clamp force in high-vibration environments like automotive subsystems, machinery, and electrical enclosures. With its fully threaded metric coarse thread design and Class 6g tolerance, this fastener delivers reliable engagement across varied material thicknesses while the pan head profile offers optimal driver access in confined spaces. These industrial screws are engineered to prevent costly maintenance and downtime in critical assemblies.

Specification Summary & Compliance

This metric fastener features precise M3 x 0.5mm coarse threads with Class 6g thread fit per ISO standards, ensuring consistent engagement across applications. The 20mm fully threaded length provides maximum holding power while maintaining dimensional accuracy. Manufacturing complies with ASME B18.13.1M specifications for mechanical fasteners. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming the absence of restricted substances for global industrial use.