CEN/SS M18 - Metal wire products

This standard specifies the calculation and design of cold coiled cylindrical helical torsion springs with  a linear characteristic, made from round wire and bar of constant diameter with values according to table 1. NOTE Quality Standards for cold coiled torsion springs will be developed later.

This standard specifies the calculation and design of cylindrical helical compression springs with a linear characteristic, made from round wire and bar of constant diameter with values according to table 1, and in respect of which the principal loading is applied in the direction of the spring axis. NOTE Quality Standards for compression spings will be developed later.

This standard specifies the calculation and design of cold and hot coiled helical cylindrical helical extension springs made from round wire and bar with values according to table 1, loaded in the direction of the spring axis and operating at normal ambient temperatures. NOTE 1 In cases of substantially higher or lower working temperature, it is advisable to seek the manufacturer's advice.    NOTE 2 Quality Standards for cold coiled extension springs will be developed later.