S-90402A711 M5 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 an external-tooth lock washer that maintains clamping force under dynamic loads
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in harsh environments
• Reliable installation torque transfer via Phillips No. 2 drive that prevents cam-out during assembly
• Optimized thread engagement with coarse 0.8 mm pitch and Class 6g tolerance for quick assembly and secure fastening
• Maximum load distribution through pan head design with 9.5 mm diameter and integrated washer for superior surface contact
• Exceptional mechanical strength with 60,000 psi tensile strength and Rockwell B73 hardness for heavy-duty applications
• Full-threaded design ensures consistent holding power along the entire 8 mm length for maximum fastening security

Professional Applications & Engineering Value

These M5 metric screws with zinc-plated steel construction and external-tooth lock washers provide critical solutions for industrial applications where vibration-induced loosening compromises assembly integrity. The combination of coarse thread pitch (0.8 mm) and Class 6g thread fit ensures rapid installation while maintaining precise tolerances for machinery, electrical enclosures, and automotive components. The pan head profile with integrated lock washer creates a wide bearing surface that distributes clamping force effectively, preventing surface damage while the external teeth bite into mating surfaces to resist rotational forces. This design addresses common failure points in vibrating equipment, offering engineers a vibration-resistant fastening solution that maintains joint integrity through thermal cycling and mechanical stress.

Specification Summary & Compliance

Manufactured to ASME B18.13.1M specifications with Class 6g thread tolerance for precision fit. The fully threaded M5 x 0.8 mm coarse pitch design provides optimal thread engagement. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors. The zinc-plated steel construction meets corrosion resistance requirements while maintaining 60,000 psi tensile strength and Rockwell B73 hardness for demanding applications.