ST4.2-18 X 19 Hex Head Self-Drilling Screw Washer Faced 304 Stainless Steel DIN7504K (5000pcs/Pkg) Package:5000 This design combines the benefits

This design combines the benefits of a nut and a washer

preventing loosening due to vibration

These general-use flat washers are placed under the head of a bolt or nut to create a smooth bearing surface and distribute the load over a wider area

reliable connection

Keps lock nuts feature an integrated washer with small teeth that grip the surface to prevent loosening

ST4.2-18 X 19 Hex Head Self-Drilling Screw Washer Faced 304 Stainless Steel DIN7504K (5000pcs/Pkg) Package:5000 This design combines the benefitsFender washers have a larger outer diameter to improve load distribution on thin surfaces, such as sheet metal. This design helps prevent damage and enhances the stability of fastened connections.