Cast iron formwork tie nuts is an element used in monolithic construction for fasting,used together with formwork tie rods.The weight of our tie nuts is from 420-630g/pcs. Base diameter is 80/ 90/100mm, and tension force is about 185-200kn. Surface could be black or sliver/golden galvanzied. Welcome to visit our official website : http://www.constructionformworkaccessories.com