This Single Wheel Gripneck Castor is designed for indoor use on furniture etc and is secured using the mating socket, Part Number CTF019 (available separately).
W= safe working load (kg).
H = overall height.
To calculate the safe working load for each castor take the weight of load in kilograms and divide by the number of castors minus one, e.g. 100kg divide by 3 (4 wheels minus 1) = 33kg. So each castor should accommodate a safe working load of 33.3kg or greater.