12:1 planetary reduction — torque and service life anchors
The GBX1200120551F is a straight-tooth planetary gearbox with a 12:1 reduction ratio, delivering a maximum output torque of 416 N.m (3681.9 lbf.in) and a continuous output torque of 260 N.m (2301.2 lbf.in), both rated at 100 rpm and 86 °F (30 °C). Service life is specified at 30000 hours at the rated 100 rpm and 30 °C — this sets the maintenance interval for the lubricated-for-life sealed unit. The 94 % efficiency figure defines the mechanical loss floor for the drivetrain thermal budget; at 260 N.m output, roughly 16.6 N.m of input torque is lost as heat within the gearbox.
Shaft loading limits and environmental sealing
Maximum axial force Fa is 2100 N at 100 rpm for the 30000-hour service life, or 2800 N for a 10000-hour duty cycle — both at 30 °C. Maximum radial force Fr is 1500 N (30000 h) or 2000 N (10000 h), with force applied at mid-distance from the output shaft. The shaft output carries an IP54 degree of protection, meaning the gearbox resists dust ingress and splashing water at the output seal — suitable for washdown environments but not immersion. Housing is black anodized aluminium with a C 45 steel shaft, giving corrosion resistance in the housing while maintaining shaft hardness for coupling fit.
Lifecycle status — obsolete, no direct successor
Per the manufacturer's lifecycle record, the GBX1200120551F is classified as Obsolete. The gearbox is available through independent distribution channels; quantities are confirmed at RFQ. For audit and tender purposes, the datasheet specifies a torsional backlash of 12 arc.min maximum and a torsional rigidity of 13 N.m/arcmin. No pin-compatible or parametric replacement is documented in the GBX family — a functional replacement would require verifying the mounting interface, shaft diameter, and reduction ratio against the application's BOM.