Definition and frame
The GBX1600250844D is a planetary gearbox from the Schneider Electric GBX series, with straight-cut gearing in a 160 mm external-diameter housing. Its reduction ratio is 25:1, which sets the speed-step between the motor shaft and the output shaft and decides which servomotor or stepper pairing fits the application's mechanical needs. The unit is built around a C 45 steel output shaft seated in a black anodized aluminium housing, and is lubricated for life — meaning no field servicing of the gear oil or grease is expected across the rated service interval. The IP54 sealing rating applies at the shaft output only, so the gearbox is suited to industrial interiors where the shaft penetrates a guarded machine enclosure rather than a washdown or outdoor environment.
Torque, rigidity, and backlash envelope
Continuous output torque is rated at 700 N·m, with a maximum output torque of 1120 N·m for peak or acceleration duty. The torsional rigidity figure of 41 N·m/arcmin describes how much the output shaft twists under load before the gear stage springs back — a higher number means stiffer positioning, which matters for servo applications where elastic wind-up would show up as following error at the load. Maximum torsional backlash is 10 arc.min — the small clearance between meshing teeth that shows up as lost motion when reversing direction. Backlash at this level is acceptable for general positioning and conveyor-style loads; for high-precision indexing or print-register duties the buyer should compare against lower-backlash options in the same 160 mm GBX family.
Load and life envelope
The allowable axial force on the output shaft is 6000 N at 100 rpm over the full 30000 h rating at 30 °C, climbing to 8000 N if the design life is shortened to 10000 h. Radial load at mid-distance from the output shaft is 4200 N across the same 30000 h envelope, or 6000 N for a 10000 h design life. These are not generic 'maximum force' numbers — they are tied directly to the operating hours, so the buyer picks the duty life first and then checks that the shaft load fits the corresponding column. Service life is rated at 30000 h at 100 rpm and 30 °C ambient; ambient air temperature for operation is -25 to 90 °C. Operating continuously at higher shaft speeds, higher ambient temperatures, or shock-loaded duty cycles will shorten life well below that 30000 h figure and must be cross-checked against the application profile.
Efficiency, acoustics, inertia
Mechanical efficiency is 94 %, which is the share of input power that reaches the output shaft after gear-mesh losses — the remainder becomes heat. Noise level is 70 dB at 1 m under no-load conditions, which is the benchmark figure buyers use to compare gearboxes acoustically when sound limits are part of the machine's installation spec. Moment of inertia is 5.81 g·cm² at the input stage, a low figure that limits the torque demand during acceleration and lets the gearbox pair with servomotors whose drive sizing is sensitive to reflected inertia. The unit can be mounted in any position, simplifying mechanical packaging inside the driven machine.
Lifecycle and supply posture
Lifecycle status is active in the current Schneider Electric GBX series.