3:1 planetary reduction, 40 mm frame
The GBX0400031403F is a straight-tooth planetary gearbox in a 40 mm diameter black anodized aluminium housing, delivering a 3:1 reduction ratio. That ratio means the output shaft turns once for every three input revolutions — a common step-down for servo or stepper applications where the motor runs at higher speed and the load needs torque multiplication. Rated efficiency hits 94 %, so only about 6 % of the input power is lost to friction and windage inside the gear train. For a 100 W motor, that's 94 W delivered to the load — the thermal rise stays low enough that the housing stays cool to the touch in most duty cycles.
Load limits and service life at 100 rpm
The gearbox is rated for 30000 hours of service life at 100 rpm and 86 °F (30 °C) ambient — that's about 3.4 years of continuous operation at that speed. The lubricant is sealed for life, so no maintenance interval for grease changes; the unit runs until the bearings or gears wear out. Maximum axial force on the output shaft is 200 N at 100 rpm for a 10000-hour life target, dropping to 160 N if you need the full 30000-hour envelope. Radial force follows the same derating curve: 200 N at mid-shaft for 10000 hours, 160 N for 30000 hours. These limits govern how the load couples to the shaft — an overhung pulley or sprocket that exceeds the radial rating will shorten bearing life fast. Torsional rigidity is 1 N·m/arcmin — meaning 1 N·m of torque twists the output shaft by one arc-minute. For positioning applications, that stiffness combined with the 24 arc.min maximum backlash sets the repeatability floor: under a 10 N·m load, expect about 34 arc.min of total angular error (backlash plus windup).
Obsolete — sourcing through independent channels
Available through independent surplus and broker channels. No stock-holding claim — each procurement is verified against current availability before quoting.