Understanding cantilever rack weight capacity is essential for safe operation and optimal storage. This guide explains the different capacity ratings, how they are calculated, and how to ensure you are operating within safe limits.
Arm Load Capacity
Arm load is the maximum weight a single horizontal arm can support. It is determined by the arm’s cross-section, length, material grade, and connection method. Longer arms have lower capacity because the bending moment increases with length. Always check the specific load chart for your rack model — a TC-2000 with 600mm arms holds 2,000 kg, but the same model with 1,500mm arms holds only 1,200 kg.
Bay Load Capacity
Bay load is the total weight allowed in one bay (the space between two uprights). It equals the sum of all arm loads in that bay. For a double-sided rack with 4 levels per side: bay load = 8 arms x load per arm. This total must not exceed the upright column’s structural capacity.
Upright Capacity
The upright column must support the combined weight of all arms and materials in its bay, plus transfer those loads safely to the floor through the base plate and anchor bolts. Upright capacity depends on column height, cross-section, steel grade, and bracing configuration.
Safety Factor
All published load ratings include a safety factor — typically 1.5x for Tcrack systems. This means a rack rated at 2,000 kg/arm has been tested to withstand at least 3,000 kg before permanent deformation. The safety factor accounts for dynamic forces during loading, impact loads, and material property variations. Never intentionally load to the safety factor limit.
How to Calculate Your Needs
Start with your heaviest single item or bundle. Add 10% for measurement uncertainty. This is your minimum arm capacity. Then calculate total inventory weight divided by number of arm positions to verify the system can hold your full inventory. Our engineers provide free load calculations — just send us your material list.
Common Mistakes
Overloading a single arm while other arms are empty (eccentric loading). Ignoring arm length derating (assuming max capacity at all lengths). Stacking materials beyond arm width (overhang creates leverage). Not accounting for material weight variations between batches. All of these can be avoided with proper planning and load chart awareness.
