1.Excavator Single Bucket Bushing 2.Process:electrophoresis,flange 3.Material:45#,40cr 4. Color:black 5.Technology:tempering 1. Product:Komatsu Excavator Track Pin and Bushing 2.Product information: (1) track bushing:40cr whole quenched and tempered / Surface super audio processing (2)track pin 45# material tempering 40cr material whol quenched and tempered 40cr material superaudio frequency As ...