THE USAGE OF POWER SPRING The products are widely used in the high-
tension switching organisms like closing-opening mechanisms,operating mechanisms
and grounding mechanisms, THE MATERIAL OF POWER SPRING The frequently used
materials include 50CrA4,51CrMoV4 and 60Si2CrVA in accordance with the satndards
like DIN17221 and GB/T1222 Executive standards, GB/T23934 JIS B2704,etc.