Countersunk pin shaft chain

The utility model discloses a countersunk pin shaft chain. The countersunk pin shaft chain comprises chain plates, chain links and pin shafts, the chain plate is of a C-shaped structure and comprises a bottom plate and side plates arranged on the two sides of the bottom plate in parallel and perpendicular to the bottom plate. The corners of the two side edges and the bottom edge of each side plate are of a right-angle structure, and the corners of the two side edges and the top edge of each side plate are of an arc structure. Two pin holes are symmetrically formed in the front end and the rear end of each side plate, and clamping grooves are formed in the pin holes. Connecting holes are symmetrically formed in the front ends and the rear ends of the chain links; the chain links are arranged between two adjacent chain plates; the pin shafts penetrate through the pin holes and the connecting holes to movably connect the chain links with the chain plates; a brim is arranged at the top of the pin shaft; and the h