plow bolt and nut 1.material: 35CrMo, 40Cr 2.HRC 38-42 ... Treament, Phosphating 4.good quality, best price, fast deliver plow bolt and nut: 1.Details:1. material: 40Cr, 35CrMo2) mechanical Grade ... ;3) process: Cold heading/hot forging 4) surface is treated with bluing, screw thread has two type description, one is the ...