The industry-standard warehouse cage warranty is one year from delivery, and some makers promise two years on standard items — but warranty does not mean every damage is replaced. Before ordering, write the warranty scope and exclusions into the contract, so that when a claim arises the two sides aren't arguing.
The warranty normally covers: manufacturing defects that appear under normal use, such as cracked welds, broken mesh welds, fractured folding hinges and cracked stacking-foot welds. On surface treatment, a powder-coat layer that flakes off in sheets without external impact, or widespread white rust on galvanizing before the zinc layer has failed, is also within the warranty.
Not covered: overloaded stacking, forklift impact, unauthorized smashing and rewelding, rust-through from outdoor rain without protection, and deformation caused by self-cutting and self-welding. Deformation caused by rough handling in transit is a logistics claim — the shipper pursues the carrier, not the maker's warranty.
Within the warranty period, the usual process is: photograph and report first; if the maker judges it a manufacturing defect, small parts (hinges, door latches, casters) are replaced free by post; if a whole cage cracks or deforms, the parties agree on resupply or a discounted refund; for large-scale problems a technician can be dispatched on site.
When buying, write into the contract the warranty start date, the criteria for judging defects, and who pays return freight. Nanjing Tongnuo Warehouse Equipment Manufacturing Co., Ltd. provides a one-year warranty on products leaving the factory, and ships with a warranty card spelling out the terms.