Abstract: The chain boards of a metal filings conveyer are respectively formed with a rectangular base plate having two short sides respectively bent inward to form a side plate. The base plate has two broadsides respectively provided along a lengthwise axis with plural pivotal tubes arranged in stagger, and the pivotal tube abutting upon the side plate is cut short to form a notch for the chain board for facilitating the base plate to be compressed and bent to form the side plates. A filling collar with a central insert hole is positioned in the notch of the chain board to fill up the notch for preventing metal filings from dropping into a location between two chain boards and protecting the chain boards from being worn off by the metal filings.