4H6的上偏差为+0.006，下偏差为0，公差值为0.0067H6的上偏差为+0.009，下偏差为0，公差值为0.009
4H6公差是0.008mm，7H6公差是0.009mm
4H6公差是0----+0.008mm，7H6是0-----+0.009mm.
