The motor they listed apparently has 1.548 kg·cm of torque at 4.8 V.
(As Ian pointed out, on this website -- like too many other websites -- "kg·cm" is often misspelled as "Kg/cm").
It is apparently a NEMA 17 motor.
From the photo, it looks about half as long as a typical NEMA 17 motor,
so I'm not surprised it has about half the torque of a typical NEMA 17 motor.
A torque of 1.548 kg·cm is more than adequate for many robots --
1.4 kg·cm of torque is adequate for axis motors on a RepRap.
They use this unit only for the stepper motors and not for the DC
Every motor Several motors listed on that site, both stepper and DC motor ( a b ), are rated using the "Kg/cm" unit, which in every case is a misspelling of "kg·cm".
0.222 ... its absurdly low again.Most DC motors on the website
The "0.222 kg·cm" applies when driven at 0.4 V. That's a small fraction of its rated voltage, which is 6 V where the motor gives 1.869 kg·cm.
As far as I can tell, all the DC motors on that website include a gear box, which multiplies the torque.
It is unfair to compare motors by comparing only the torque at the output of a torque-multiplying gear box of one motor driven at its full rated voltage, to the torque of some other motor without a gearbox and when driven at a small fraction of its rated voltage.
On the other hand, I have to laugh when this website calls this a "High torque" motor when it is almost the lowest-torque NEMA 17 motor I've ever seen.
It reminds me of the "Schnell-Bahn" (literally "fast train"), which are the slowest trains still operating in Germany.
I shouldn't have said "every motor"; most of the motors are rated in "Kg-cm" or "kg-cm", which is close enough to "kg·cm".