leaf spring pin, truck spring pin 1.surface:black,zp,phosphated 2.grade:8. ... 3.material:carbon steel 140#, 45#, 40Cr leaf spring pin, spring pin, truck spring pin1.surface:black,zinc plated,phosphated2.grade:8. ... :carbon steel 140#, 45#, 40CrSatisfactory services:We can produce spring pins as per your drawing or samples.We can supply package ... please feel free to contact me. high quality leaf spring pin