Planetary gearbox for precision motion — 25:1 reduction, 700 N.m continuous
The GBX1600250703F is a straight-tooth planetary gearbox from Schneider Electric's GBX series, sized for servo and stepper motor applications that need a 25:1 reduction ratio in a 160 mm diameter package. Continuous output torque is 700 N.m (6195.5 lbf.in) at 100 rpm and 30 °C, with a maximum intermittent torque of 1120 N.m (9912.8 lbf.in) under the same conditions — the margin matters for acceleration peaks and emergency stops. Efficiency is listed at 94 %, which is typical for a single-stage planetary with straight teeth; the 10 arc.min maximum torsional backlash suits positioning axes where repeatability matters more than absolute accuracy.
Load ratings and service life at 100 rpm
Rated service life is 30000 hours at 100 rpm and 30 °C ambient — the gearbox is lubricated for life, so no oil-change interval to schedule. Maximum radial force Fr is 4200 N applied at mid-shaft for the 30000-hour life, or 6000 N for a 10000-hour duty cycle; maximum axial force Fa is 6000 N for 30000 hours or 8000 N for 10000 hours. Torsional rigidity is 41 N.m/arcmin — this stiffness figure governs how much windup the load sees under torque, which matters for servo tuning and contouring accuracy.
Construction and environmental limits
Housing is black anodized aluminium, 160 mm external diameter; the output shaft is C45 steel. Shaft output seal is rated IP54 — suitable for dry indoor environments but not washdown; operating ambient range is -25 to 90 °C. Noise level at 1 m under no-load is 70 dB — a mid-range figure for this size class; the straight-tooth design is inherently noisier than helical, so acoustic enclosures may be needed in quiet zones.
Obsolete — sourcing through independent channels
The part is available through independent surplus and broker channels; quantities are lot-specific and confirmed at RFQ.