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truck brake drum OE NO: 0310669110 suit for BPW truck or trailor Vehicle type: heavy duty vehicle brake drumDetail features:                                      1.Chemical  specification ItemstandardsBrake drumC3.1--3.43.25Si1.9--2.31.9Mn0.6--0.90.8P0.15 MAX0.08S0.12MAX0.092.Physical propertitiesItem standardsBrake drumTensile strength 245 N/m? MIN264Hardness HB187--241 HB231microstructureA 85% MIN+B5%MAXA 90% MIN+B 3%MAXDynamic balance Disc260 g-cm    MAXDynamic balance Drum1300 g-cm MAX500  3.ApperanceThe drum and disc’s surface checked and free of chills,shrink,porosity,slag,inclusions,c