Steel material boxes and warehouse cages are both metal turnover containers, but their side walls differ completely: the box is a closed bin welded from steel plate, the cage is a wire-mesh panel on a frame. Each suits a different range in load, spill control, ventilation and stacking, and they cannot substitute for each other.
A steel material box is brake-formed and welded from steel plate: closed walls, high strength, impact-resistant, suiting heavy castings, forgings, steel swarf and sharp blanks. The downsides are heavy self-weight, no ventilation and no visibility inside; single-layer load reaches 1–2 tons, but folding and stacking flexibility of empty boxes is weaker than warehouse cages.
The warehouse cage is a mesh structure: light self-weight, foldable, stackable to 4 layers, suiting medium-weight machined parts, standard parts and packaged goods. The mesh walls ventilate and transmit light for visual counting, but it leaks loose material and tiny parts, and sharp heavy items can cause local bulging.
The selection logic is simple: if a single part exceeds 500 kg, or material is sharp or fragmented, prioritize the steel material box; if a single part is 50–300 kg and you need frequent folding of empty cages and multi-layer stacking, choose the warehouse cage. Nanjing Tongnuo Warehouse Equipment Manufacturing Co., Ltd. makes both product lines and can give a combined plan by material weight and turnover frequency.
One-line distinction: closed, impact-resistant, for heavy parts — choose the box; open, foldable, multi-layer stacking — choose the cage. On one production line the two are often used together: heavy parts into the box, transit parts into the cage.