The YKK Group (YKK, Waikeikei Gurūpu) is a Japanese group of manufacturing companies. As the world's largest zipper/zip manufacturer, YKK Group is most famous for making zippers; however, it also manufactures other fastening products, architectural products and industrial machinery.The initials YKK stand for Yoshida Kōgyō Kabushikigaisha (Japanese: 吉田工業株式会社), meaning "Yoshida Manufacturing Shareholding Company".