The GBX1201001003F is a straight-tooth planetary gearbox with a 100:1 reduction ratio — that's one input revolution for every 100 output revolutions, sized for servo or stepper motor output shafts needing high torque multiplication in a compact 120 mm diameter package. Continuous output torque is 260 N.m at 100 rpm; maximum intermittent torque hits 416 N.m — the 60 % headroom handles acceleration peaks without oversizing the gearbox, but the 30,000-hour service life at rated load is the real constraint for continuous-duty axes. Torsional backlash is 14 arc-min maximum — acceptable for positioning conveyors or rotary tables where absolute precision isn't critical, but too loose for a CNC ball screw or indexing turret where you'd spec a low-backlash (<3 arc-min) planetary.
Lifecycle reality — obsolete, sourced through independent channels
Available through independent surplus and NOS (new old stock) distribution; quantities are lot-specific and confirmed at RFQ. The 94 % efficiency and 65 dB noise level at 1 m no-load are the original factory ratings — verify the input shaft interface and mounting flange dimensions against your existing BOM position before ordering.
Shaft loads and environmental sealing
Maximum axial force on the output shaft is 2100 N at 100 rpm for the full 30,000-hour life, or 2800 N if you accept a shorter 10,000-hour window. Radial force limits are 1500 N and 2000 N respectively, applied at mid-span of the output shaft — exceeding these bends the shaft and wears the bearings asymmetrically. Shaft output sealing is IP54 — splash protection, not washdown. The black anodized aluminium housing with C45 steel shaft is fine for dry indoor environments; for wet or dusty conditions you'd need a higher IP-rated gearbox or a bellows boot on the output.
Operating envelope and lubricant
Ambient operating range is -25 °C to +90 °C — the grease stays fluid down to -25 °C and doesn't degrade until above 90 °C. The unit is lubricated for life, so no oil changes or regreasing intervals on the PM schedule. Torsional rigidity is 12 N.m/arcmin — the shaft wind-up under rated load is about 22 arc-min at 260 N.m continuous, which is within the backlash budget for most open-loop positioning but matters if you're closing a position loop through the gear train.