... for Track Shoe Bolt/ Plow Bolt 1.Mechanical Grade is 12.9,2.Case Hardening is HRC 38-42,3.High ... Technology, Professional Production4.Top Quality, Good Price, Quick ... high qualityAll the specification can be customized.MaterialStainless steel, carbon steel ,copper Surface TreatmentBluing, Phosphorization, according to your requirementUsed FieldsConstruction industry—excavator ...