Product Name: Cap Nut.
Material: Carbon steel.
Standard: GB.
Finish: Nickel plated and black.
Size: M3 to M12.
These cap nuts feature a round head and internal metric thread with a blind hole. They protect threaded ends from rust, damage, and dirt. Compatible with standard screws including cylinder, round head, countersunk, hex, and machine screws. Suitable for dry, damp, and outdoor environments. Used in mechanical, automotive, wood construction, and furniture industries.