Axial Expansion Joints are the simplest type of expansion joints using single bellow unit.Stainless steel expansion joints are compact requiring virtually no additional space beyond the length of bellows and weld ends or flanges for installation. Axial Expansion Joints have further advantage of not imposing a change in the direction of flow. Where small thermal movements are involved and where proper anchoring and guiding is possible, single axial bellows provide the most economical solution.