Bottom Stop: Bottom Stop (下止)
The component that joins the two tape ends at the lower end of a closed-end zipper and blocks the slider from leaving the chain. It carries repeated impact from the slider and resists lateral opening, so its strength is a key reliability indicator for trousers, bags and home textiles. Bottom stops are moulded from resin, stamped from metal or formed by a sewn bar, and must stay aligned with the tape centre line.