100:1 reduction, 260 N.m continuous — the duty envelope
The GBX1201000554F is a 120 mm-diameter planetary gearbox with straight-cut teeth, delivering a 100:1 reduction ratio. At 100 rpm input the continuous output torque is 260 N.m (2301.2 lbf.in) at 30 °C, with a peak capability of 416 N.m (3681.9 lbf.in) — the gap between continuous and maximum defines the overload duty cycle you can sustain without exceeding the 30000-hour service life target. Efficiency is listed at 94 %, meaning 6 % of the transmitted power converts to heat inside the housing. For a 260 N.m load at 100 rpm (about 2.7 kW input), that's roughly 160 W of thermal loss that the black anodized aluminium housing must dissipate — relevant if the gearbox is enclosed in a non-ventilated machine frame.
Backlash, bearing loads, and noise floor
Maximum torsional backlash is 14 arcmin — this is the lost motion between input and output when reversing direction. For positioning applications (indexing tables, pick-and-place axes) this sets the repeatability floor; a lower-backlash gearbox would be needed if the system requires sub-arcminute positioning. The output shaft carries a maximum axial force of 2100 N and a maximum radial force of 1500 N at 100 rpm over the 30000-hour life, with higher loads permissible for shorter durations (2800 N axial, 2000 N radial at 10000 hours). These limits govern how much overhung load or thrust the output bearing can tolerate before life is reduced — a chain sprocket or belt pulley mounted on the shaft must be sized to stay within these radial force limits. Noise level is 65 dB at 1 m under no-load conditions — this is the acoustic baseline from gear mesh and bearing noise. Under load the level will rise; the straight-tooth geometry is inherently noisier than helical gearing at the same power level.
Obsolete — sourcing through independent channels
The part is sourced through independent surplus and broker channels; quantities are lot-specific and confirmed at time of RFQ. No pin-compatible or dimensionally identical replacement is documented by the manufacturer — any substitution requires a mechanical re-evaluation of the mounting interface and output shaft dimensions. The gearbox is lubricated for life and sealed to IP54 at the shaft output — splash-resistant but not suitable for washdown environments. The housing is black anodized aluminium, shaft material is C45 steel. Operating ambient range is -25 to 90 °C.