●Material=Carbon spring steel. Hardess=HRC45~50. Finish=Black phosphate coaing (ACP) 
          ●Material=Stainless spring steel 
            Nite; Max. D shall be checked by a "Go" ring gage. Min. D shall be the average of the D1, D2, and D3 diameter. 
            For orderingplease write nominal dia and length as well. Example: "SPP 4X20" 
            ※marks are accordingto our company's specification.                                                                                                                                                                                                                                                                                             
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