Sep 05, 2019 · “It was the first six-axis robot with a [capacity] of 500 kilograms, which is still considered heavy payload today. Most people in our industry considered anything above 250 kilograms to be heavy payload 15 years ago. “Today’s IRB 8700 weighs 4,525 kilograms and has a maximum end-of-arm payload of 800 kilograms,” explains Williamson.