... spring pin 1.surface:black,zp,phosphated 2.grade:8.8,10.9,12.9 3.material:carbon steel140#,45# high strength ... king pin, isuzu king pin, leaf spring pin, hino king pins1.surface:black ... steel 140#, 45#, 40CrSatisfactory services:We can produce spring pins as per your drawing or samples.We can ... , please feel free to contact me. high strength king pin