... spring pin, leaf spring pin, king pin 1.surface:black oxide, zinc plated, phosphated 2.grade:10.9,12.9 3.material:carbon stee truck spring pin, nissan spring pin ... , 3.5 inch king pin, shackle pin 1.surface:black oxide, zinc plated ... 93.material:45#, 40Cr Satisfactory services:We can produce spring pins as per your drawing or samples.We can ...