The GBX0400031404F is a 40 mm diameter planetary gearbox with a 3:1 reduction ratio and straight-cut teeth, rated for 94 % efficiency and a maximum torsional backlash of 24 arc.min. That 94 % efficiency means about 6 % of the input power is lost as heat in the gear mesh — typical for a single-stage planetary with straight teeth, and the reason the housing is black anodized aluminium to radiate that heat. The 24 arc.min backlash is the total angular play between input and output when the direction reverses; for positioning applications that need tighter repeatability, a lower-backlash gearbox (e.g. 10 arc.min or less) would be the better fit.
Load ratings and service life — the real constraints
Rated service life is 30000 h at 100 rpm and 86 °F (30 °C), with the gearbox lubricated for life — no maintenance re-greasing interval. Maximum axial force on the output shaft is 200 N at 100 rpm for a 10000-hour life, dropping to 160 N for the full 30000-hour rating at the same speed and temperature. Maximum radial force is also 200 N at 100 rpm for 10000 hours, applied at mid-distance from the output shaft, and 160 N for 30000 hours — these are the numbers to check against the belt or chain pull in your drive train. Torsional rigidity is 1 N.m/arcmin — a measure of how much the gearbox twists under load; for a 11 N.m rated output (from the description), expect about 11 arcmin of wind-up at full torque.
Obsolete — sourcing reality for this gearbox
Available through independent surplus channels — quantities are lot-specific and confirmed at RFQ; condition is typically new-in-box or new-old-stock from cancelled orders or overstock.