1speeding test: 180° c, 39000RPM 3min, diameter, Max, between changes 0.015 for poor 0.003 Max 2fails to note tolerances size deviation according to the limit GB1804 - m. 4 insulation resistance: use ZhaoOuBiao 500V and reversing measuring insulation resistance between the collar, normal 500MOmin, hot 150 ° c, baked 30 points 50MOmin measuring insulation resistance 5 the hook