Originally Posted by Kajtek1
Metal stands fail without warning. They just split, or shear off the pin. Maybe UK has better laws, but in US the rating is misleading. The so-called 2-t stand is rated for 2-ton CAR. Meaning supporting 1/2 ton corner with some safety margins. To lift 1-ton axle you need at least 3-ton jack.
No matter what my car stands on, I always try to put the wheel, or wood planks under the sides. Have to admit that in emergencies the safety was not always priority, but I survived without accident so far.
The UK is no better, and it's as interesting point you raise about the ratings.
I have just checked my stands in their box. It states (in 6 European languages) max capacity: 2 tons per pair. Now my metric conversion tables do not recognise the ton. I can either have the long ton at 2240 pounds, or the short ton at 2000 pounds. At worst then, they are good for 4000lbs per pair.
[That spec surprises me as these European countries all use the metric system, so perhaps they reallly mean 2 tonnes, which = 2000Kg.]
The unladen weight of my CLK is 1700Kg (3747 pounds) three quarters of which I estimate is distributed over the front wheels. Say that is around 3000 pounds. Add a 50% safety factor, and you get a weight of 4500 pounds.
Unless my math is wrong, I don't think that these stands are safe enough for my car.