This research was designed and built by jack bolts metric size M16 phase pit. 2 mm.To investigate the relationship between. Bending moment of lifting the car compared to the height of the jack. The relationship between the tensile strength and yield strength compared to the height of the jack.From the results, it was found that the bending moment in the raised directly proportional to the height of the jack. The maximum bending moment the wheels hanging from the floor 41.20 N.M and the tensile strength and yield strength varied with height of the jack in the 26-29 cm height and the tensile strength and yield strength Start with constant height of the jack 30 cm. Due to the angle of pieces per link is changed little.65 N / mm2 position in contact with Jack start point supports used in lifting the car. And the efficiency increased with height of the jack. Trends of the reduced efficiency. When the phase of the jack is high.163%
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