Planetary gearbox, 12:1 reduction, 20 N.m continuous
The GBX0400121002F is a straight-tooth planetary gearbox in a 40 mm diameter black anodised aluminium housing, with a 12:1 reduction ratio and a continuous output torque of 20 N.m at 100 rpm. Maximum output torque reaches 32 N.m at 100 rpm, and the unit is lubricated for life — no maintenance schedule for oil changes in the field.
Torque, efficiency, and noise — what the ratings mean
94 % efficiency means the gearbox loses only 6 % of input power to friction and heat — relevant for sizing the upstream motor and managing thermal rise in a confined enclosure. Noise level is 55 dB at 1 m under no-load — roughly the hum of a quiet office printer — so the unit can run in a lab or assembly area without acoustic treatment. Torsional rigidity is 1.1 N.m/arcmin, which limits angular deflection under load; the maximum torsional backlash is 28 arc.min, so this is not a zero-backlash servo gearbox but works for positioning with moderate precision.
Environmental limits and shaft loads
IP54 at the shaft output means the gearbox is protected against dust ingress and splashing water — suitable for dry indoor machine builds, not washdown zones. Maximum axial force Fa is 200 N at 100 rpm for a 10,000-hour life at 30 °C; maximum radial force Fr is the same 200 N applied at mid-shaft. Both derate to 160 N for a 30,000-hour target.
Lifecycle — obsolete, sourced through independent channels
Available through independent surplus and broker channels; quantities are lot-specific and confirmed at RFQ.