The GBX1200251004F is a planetary gearbox with a 25:1 reduction ratio, meaning the input speed is divided by 25 while the output torque is multiplied by the same factor (minus friction losses). Continuous output torque is rated at 230 N.m at 100 rpm and 30 °C — this is the sustained load the gearbox can carry without overheating or exceeding the 30000-hour service life. Peak capability reaches 368 N.m under the same conditions, useful for acceleration or momentary overloads. Efficiency is listed at 94 %, which means about 6 % of input power is lost as heat — typical for a single-stage planetary with straight teeth.
Load capacity and stiffness — sizing the gearbox to the application
Maximum axial force on the output shaft is 2100 N for a 30000-hour life at 100 rpm, or 2800 N if you accept a shorter 10000-hour service interval. Maximum radial force (applied at mid-distance from the output shaft) is 1500 N for 30000 hours, or 2000 N for 10000 hours — these limits govern overhung loads from pulleys or sprockets. Torsional rigidity is 13 N.m/arcmin, which tells you how much the gearbox twists under load — lower is stiffer, important for positioning accuracy in servo axes. Maximum torsional backlash is 12 arc.min — this is the lost motion between input and output when reversing direction, a key spec for pick-and-place or indexing applications.
Environmental fit and mounting
The gearbox has an IP54 rating at the shaft output, meaning it is protected against dust ingress and splashing water — suitable for dry indoor environments but not washdown. The gearbox is lubricated for life, so no oil changes or regreasing intervals to schedule.
Sourcing reality — obsolete but available
The part is available through independent distribution channels; quantities are confirmed at RFQ and sourced against the BOM line.