¢ 7.4 × 56.5 × 206.5 × 14.6 black plastic, used for motorcycle rear shock absorber, drawn from 60Si2Mn oil quenching spring wire, wound into warp, then completed and set by multi-channel processes, and done surface treatment according to the requirements of customers. (With some technical requirements)
Technical Requirements:
1) Total number of coils: 14.6
2) Number of active coils: 12.6
3) Free height: 206.5mm
4) Port deburring
5) Both ends of the surface were wore off, circumference is not less than 3/4
6) Shot blasted: pills ¢ 0.8mm ~ ¢ 1.2mm, intensity 0.2 ~ 0.45A, coverage of 80%
7) Surface treatment: black spray

http://www.Weiyuanspring.com/motorcycle-back-shock-absorber-spring/26