Insulation class Class B 130 C Insulation resistance 100MΩminimum under normal temperature and humidity, when measured by a 500VDC megger between the motor coils and casing Insulation voltage Sufficient to withstand 1.0kv, 60Hz applied between the motor coils and casing for 1 minute, under normal temperature and humidity Temperature Ambient temperature - 10C ~ + 50C Ambient Humidity 85% or less Gas medium No corrosive gas and dust, can not directly contact water and oils(expect special airproof motor) Temperature rise Resistance Method is 80 oC or less (at standstill, two phase energized) Shaft Runout 0.05mm(T. I. R) at top of output shaft Axial Play 0.025mm Max. Of 1.12 1b. (5N) Redial Play 0.075mm Max. Of 2.2 1b. (10N)