... ,10.9,12.9 3.material:carbon steel 140#, 45#, 40Cr leaf spring pin, spring pin, truck spring pin1.surface:black,zinc plated,phosphated2 ... .grade:8.8,10.9,12.93.material:carbon steel 140 ... #, 45#, 40Cr Satisfactory services:We can produce spring pins as per your drawing or ...