Planetary gearbox — 12:1 reduction, 120 N.m continuous
The GBX0800121004F is a straight-tooth planetary gearbox from the Schneider Electric GBX series, sized for servo and stepper motor applications requiring a 12:1 reduction ratio. Continuous output torque is 120 N.m at 100 rpm and 30 °C, with a maximum intermittent torque of 192 N.m under the same conditions — the margin covers acceleration peaks in indexing or positioning cycles. Rated service life is 30,000 hours at 100 rpm and 30 °C, lubricated for life with no maintenance interval. The 94 % efficiency figure means 6 % of input power is lost to gear mesh friction — typical for a single-stage planetary with straight teeth and no helical overlap.
Load ratings and mechanical limits
Maximum axial force on the output shaft is 1200 N for a 10,000-hour life, derated to 900 N for the full 30,000-hour rating. Radial force limits are 950 N at 10,000 hours and 650 N at 30,000 hours, both measured with the force applied at mid-span on the output shaft. These values set the overhung load budget for belt drives or direct-coupled loads. Torsional backlash is 14 arc-min maximum — a standard precision grade for positioning axes where the load holds position after the motor stops. Torsional rigidity is 6.5 N.m/arcmin, which defines the wind-up under load; for a 120 N.m step, the shaft twists about 18 arc-min before the output moves. The housing is black anodized aluminium, 80 mm outer diameter, with the output shaft in C45 carbon steel. Shaft output seal is rated IP54, so the gearbox is splash-resistant but not submersible — mount with the shaft axis horizontal or pointing down to avoid pooling at the seal lip.
Lifecycle — obsolete, sourced through independent channels
Available through independent surplus and broker channels. Quantities are confirmed at RFQ — no stock-holding claim is made here.