Heavy Duty Tables 20,000# Capacity  
We build our Heavy Duty series tables by combining heavy wall tubing with our exclusive Cinch-Lockā„¢ welded corner design. Mark was asked to test this 30" high bench by adding particleboard until it fell down. He came back with this photo, but couldn't add any more particleboard, as he had reached the ceiling.

The strength of this bench is achieved by the use of heavy electro-welded tubing and our exclusive Cinch-Tite corner assembly system.  (We found that angle iron and channel iron twisted when heavily loaded).
Eventually he ran out of height . . .  
At slightly over 20,000 pounds.