These cap nuts are made from 304 stainless steel with a natural surface finish and adhere to the GB standard. They feature a round head with internal metric threads and a blind hole, designed to protect threaded ends from rust, damage, and dirt. Compatible with standard screws including cylindrical, round head, countersunk, and hex types, they are suitable for dry, damp, and outdoor environments. Applications include mechanical industry, automobile and motorcycle manufacturing, wooden and steel structures, and furniture construction.