A connector for a linear guideway is integrally formed by injection molding. The mold assembly of making the connector includes an upper mold, a lower mold and a pin. The variable cross section design of the pin enables the connector to have a plurality of ring-shaped portions with more than two different radial thicknesses, so that the distances between the respective rolling elements are different, and the frequencies of the respective rolling elements are also different, and as a result, the resonance sound pressure caused by the linear guideway and the machine are reduced. In addition, the variable cross section design of the pin reduces the manufacturing difficulty of making a relatively long connector.