Every catalog says “heavy duty.” Load class is the part that actually tells you it will hold.
"Heavy duty" is a marketing term. Load class is an engineering one — it describes how a cover, grate, or curb performs under repeated point loading from forklifts and pallet jacks. A thick cover with the wrong support spacing can still fail faster than a properly designed thinner one.
Material gauge and thickness — the starting point, but not the whole answer
Support bracket spacing beneath the cover or grate
Cover and grate design — slot width, rib pattern, and weld points
Anchoring into the slab, so the whole assembly moves as one unit under load
Forklift-rated hardware costs more, and a foot-traffic-only room may not need the same load class as a loading dock. We'd rather spec the room correctly than sell you a rating you don't need.
Tell us what's moving across the floor — forklifts, pallet jacks, foot traffic only — and we'll recommend the right rating, not the most expensive one.