Metric hex nylon insert lock nuts, Stainless steel 316 (A-4), Coarse (standard) thread, 6mm

Nut size (A.K.A. diameter) is the size bolt that the nut is used with. The same is true of the thread pitch. Thus a 6mm x 1.0 nut fits a 6mm x 1.0 bolt.

Note: Stainless lock nuts may require extra care during installation to avoid galling (seizing up). More info.