> it's just that it's a bit hard imagining all these Nms.

1Nm is the torque exerted by 1N acting on the end of a perfect pivot 1m long.

1N is the force exerted by gravity on a mass of about 102g

So imagine a (weightless) metre rule, with 102g hanging off the end of it - that's 1Nm

25Nm is 2.55kg hanging from the end of the metre ruler.

Whether that helps or not is another matter

Adrian.