What this gearbox delivers on a running line
The GBX1200030703F is a straight-tooth planetary gearbox with a 3:1 reduction ratio, meaning the output shaft turns one revolution for every three input revolutions while multiplying torque by roughly the same factor (minus efficiency losses). Continuous output torque is 115 N.m at 100 rpm and 30 °C ambient, with a maximum of 184 N.m available for peak loads — the continuous figure is the one to size against for steady-state conveyor or indexing duty. Efficiency is listed at 94 %, so about 6 % of the input power is lost as heat inside the housing — the black anodized aluminium body (120 mm diameter) acts as the heatsink, and the lubricated-for-life grease handles the thermal load without maintenance intervals.
Mechanical limits and service life
Rated service life is 30,000 hours at 100 rpm and 30 °C — that is about 3.4 years of continuous operation at that speed. The axial force limit is 2100 N and the radial force limit is 1500 N, both measured at the mid-point of the output shaft at 100 rpm for the full 30,000-hour life. Maximum torsional backlash is 8 arc-minutes — this is the angular play between input and output when reversing direction, which matters for positioning accuracy in pick-and-place or indexing applications. Ambient operating range is -25 to 90 °C, so it handles both cold starts in unheated enclosures and heat near motors or ovens. The shaft output seal is rated IP54, meaning dust-protected and splash-resistant — not submersible, but fine for most factory floor conditions.
Sourcing reality — obsolete, but available
This gearbox is available through independent surplus and broker channels. Quantities are lot-specific; we source and quote against your BOM.