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 ... 12.93.material:45#, 40CrSatisfactory services:We can produce spring pins as per your drawing or samples.We can ...