The welding of Friction Stir Welding (FSW) is one of the welding method of Solid State Welding (SSW). The rotation and design tool is parameter that very important in welding of FSW. The characteristics of physical and mechanical properties in advancing and retreating side in the welding result of FSW shows differences. This research conducted for balancing the properties between advancing and retreating side with two side of welding. The material of aluminum plate 1xxx thickness 5mm cuts by the size of 100mm x 60mm. The welding process of FSW of two side conducted in different side using variation rotate speed tools 950, 1500, and 2300 rpm by feed rate 20mm/minute constantly. Then, the welding result tested by tensile testing using Ultimate Tensile Machine, hardness test with a micro Vickers, observation of the macro and micro structure by optical microscope. The result of this study showed that wormholes defects in the welding result in all varian of rotate speed tool were observed. Whereas, on the observation of micro grain shape on the stir zone has a smallest and densest granular crystal compared with other areas. The hardness testing result showing spesimens being welded with rotate speed tool of 950 rpm has hardness that closest to raw material about 34 VHN and the lowest hardness testing is in the specimen of rotate speed tool of 1500 rpm about 28.5 VHN. The result of tensile testing has average of ultimate strength for two side of FSW by using rotate speed tool 950 rpm is 85.24 MPa or 76.21 % from raw material that has value of tensile strength 111.86 MPa, rotate speed tool of 1500 rpm is 37.55 MPa and 2300 rpm about 52 MPa. The low rotate speed in the welding of FSW produces heat input that not too high, so the form and amount of grain the expansion is not much different with the raw material. Then, it results high tensile strength approach the raw material directly proportional to the high hardness value also.