SeaKing Stores › M4 A2 stainless hex full nut - EACH M4 A2 stainless hex full nut - EACH £0.10 M4 thread size. A2 stainless steel hexagon full nut. Sold individually; quantity 10 means ten loose nuts. Supplier reference: A2FNM04. Add To Cart Added! M4 thread size. A2 stainless steel hexagon full nut. Sold individually; quantity 10 means ten loose nuts. Supplier reference: A2FNM04.