Motor, DC. Reversible PM 18VDC, 100mA, 3500 RPM no load. Torque constant: 49.4 m/Nm/Amp. Dy. Res: 6.84 ohms. Motor Regulation: 28RPM/m-NmTorque: 126m-Nm 2.63Amp at stall. Maximum efficiency: 68%. Torque: 20m-Nm, speed: 2944RPM, current: 0.51Amp, output: 6.17 watts. Maximum power: Torque: 62m-Nm, speed: 1753RPM, current 1.37A. Output: 11.47 watt. Shaft Length: 11mm 0.435", shaft diameter: 3.1mm 0.125". Has an attached pulley: 10mm 0.39" inside diameter x 4.6mm 0.18" inside length. Motor: 38mm 1.495" D x 83mm 3.27" long overall. Rotation: clockwise when viewed from shaft output end with positive applied to positive. Weight: 8 oz. Note: PM = Permanent magnet.