120 mm planetary box — torque and backlash at the shaft
The GBX1200200552F is a straight-tooth planetary gearbox from Schneider Electric's GBX family, sized for servo and stepper motor applications where a 120 mm housing diameter fits the mechanical envelope. It delivers a continuous output torque of 260 N.m at 100 rpm and a maximum output torque of 416 N.m under the same conditions, making it a match for indexing tables, linear actuators, and conveyor drives that need a 20:1 reduction step. The 12 arc-min maximum torsional backlash places it in the precision class for general positioning — not zero-backlash, but tight enough for most pick-and-place and rotary indexing duties where a few arc-minutes of lost motion is tolerable.
Torque, life, and the 94 % efficiency number
Rated 94 % efficiency per stage at full load — the straight-tooth design trades a few points of efficiency against cost compared to helical planetary boxes, but stays competitive for speed ranges under 100 rpm where the continuous torque rating applies. Service life is specified at 30,000 hours at 100 rpm and 30 °C ambient — the lubricated-for-life fill means no maintenance intervals for oil changes, but the life clock ticks faster if the output torque exceeds the continuous 260 N.m figure regularly. Maximum axial force Fa of 2100 N and radial force Fr of 1500 N at the 30,000-hour rating (both at 100 rpm, mid-span on the output shaft) define the overhung load budget — a belt drive or pinion pushing past these numbers shortens the bearing life before the gear teeth wear out. Shaft output carries an IP54 protection rating — fine for dry factory floor air, but not for washdown or direct coolant spray. The housing is black anodized aluminium, the shaft material is C45 steel.
Obsolete — sourcing from the surplus channel
Available through independent surplus and broker channels. Quantities are lot-specific; we quote each RFQ against current market availability. No pin-compatible direct replacement exists from Schneider — a functional substitute would require checking the mounting flange, shaft diameter, and ratio against the current GBX family or a third-party equivalent.