Number of gear stages 2
Gear ratio i 12
Nominal output torque T2N [Nm] 120.0
Max. output torque T2max [Nm] 192.0
Emergency switch-off torque T2stop [Nm] 240
Idle torque [Nm] at 20°C and 3000 rpm 0.35
Max. average drive speed n1N50% [rpm] at 50% T2N and S1 4000
Max. average drive speed n1N100% [rpm] at 100% T2N and S1 3550
Max. drive speed n1max [rpm] 7000
Max. backlash Jt [arcmin] 9
Reduced backlash Jt [arcmin] less than 0
Torsional rigidity Ct21 [Nm/arcmin] 6.5
Tilting rigidity C2K [Nm/arcmin] 0.0
Max. breakdown torque M2Kmax [Nm] 0.0
Max. radial force Frmax [N] for 30,000 h 4800
Max. radial force Frmax [N] for 20,000 h 5500
Max. axial force Famax [N] for 30,000 h 5700
Max. axial force Famax [N] for 20,000 h 6400
Operating noise LPA [dB(A)] 60
Efficiency at full load ŋ [%] 94
Min. operating temperature BTempmin [°C] -25
Max. operating temperature BTempmax [°C] 90
Mounting orientation Any
Degree of protection IP 65
Weight m [kg] 3.40
Moment of inertia J1 [kgcm2] 0.722
Material number:
Coaxial PG, i = 012, 2-stage, IP65
Documentation Version (Date) Download
8GP55 motor mounting instructions PDF / 435 KB
Datasheet 8GP55-060 PDF / 147 KB
Datasheet 8GP55-080 PDF / 148 KB
Datasheet 8GP55-120 PDF / 147 KB
General Version (Date) Download
System overview planetary gearboxes PDF / 3 MB

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