Racking load
Also called: rack load, racking capacity, edge racking capacity, rack weight
Racking load is the weight a pallet can safely carry while it spans the gap between rack beams with no support underneath. It is usually the lowest of a pallet's ratings and depends on the span, the direction racked and the number of beams.
In depth: Pallet racking and deflection: rack spans, direction and sag limits
In a rack, the pallet acts as a beam. The load sits on the deck, the deck and stringers or stringerboards bend across the open span, and only the ends rest on the rack beams.
Typical values
| Case | Racking rating |
|---|---|
| Plastic rackable pallets | About 1,500 to 4,400 lb (680 to 2,000 kg) |
| GMA-style 48 × 40 in wood, racked across length, 44 in span (one PDS example) | 1,558 lb (707 kg) |
| Same pallet, racked across width, 36 in span, 0.75 in deflection limit | 1,006 lb (456 kg) |
What drives it
- Direction: racked across length or across width.
- Span: the clear distance between supports. A wider span lowers capacity.
- Deflection limit: often about 2% of span. A tight limit can govern before strength does.
- Duration and temperature: creep matters for wood and even more for plastic.
On a spec sheet or RFQ
Give the rack type, the direction the pallet sits, the beam span or beam spacing, two- or three-beam support, and any deflection limit. PDS reports it as, for example, "Racked Across Length, 2 Beam Support, Span = 44.00".
Common confusions
A racking rating applies only at the tested span. Plastic makers call the common case "edge racking": the pallet spans its length and is supported on its short edges. A pallet on wire decking or a solid shelf is not racked in this sense; that is shelf support.
Related
- GuidesPallet racking and deflection: rack spans, direction and sag limitsIn a rack a pallet spans between two beams with nothing underneath, so it bends. Racked across the length (stringers span about 40 to 44 in on a 48 in pallet) is usually stiffer than across the width (deckboards span about 36 in). Common deflection limits are about 2% of span, or 0.5 in or less for automated storage.
- GlossaryRacked across lengthRacked across length is a support condition where the rack beams support the pallet's two ends and the pallet's length spans the open gap. On a stringer pallet the stringers carry the load across the span.
- GlossaryRacked across widthRacked across width is a support condition where the rack beams support the pallet's two long sides and the pallet's width spans the open gap. On a stringer pallet the deckboards, not the stringers, carry the load across the span.
- GlossaryDeflectionDeflection is the amount a pallet bends or sags under load, measured at the point of greatest movement. Racking limits are commonly about 2% of the span, and automated systems often require 0.5 in (13 mm) or less.
- GlossaryWhat is pallet racking?Pallet racking is a steel storage structure of upright frames and horizontal beams that holds loaded pallets in levels above the floor. The pallet usually spans the gap between two beams, so its racking load rating, not its floor rating, governs.
- TypesRackable plastic pallet: runners, reinforcement and racking ratingsA rackable plastic pallet is designed to sit in open-beam racking with nothing underneath. It has runners (3, 5 or 6) or a perimeter or cruciform base, often with steel reinforcement. Racking ratings for 48 × 40 in models are typically about 1,500–4,400 lb, valid only at the tested span and orientation.
More in Performance and engineering
- GlossaryConcentrated loadA concentrated load is a load that bears on one or a few small areas of the pallet deck instead of spreading over it, such as drums, machinery feet or a coil. It usually gives a much lower safe load than the same weight spread evenly.
- GlossaryCreepCreep is the gradual increase in a pallet's deflection while a load stays on it over time. Wood creeps, and plastic creeps much more, especially when warm, so racked pallets sag more after days or weeks than when first loaded.
- GlossaryDurabilityDurability is a pallet's ability to survive repeated handling, measured as the number of trips or handling cycles before it needs repair or is scrapped. It is driven by fastener quality, lead board width, member thickness and species density.
- GlossaryDynamic loadDynamic load is the weight a pallet can safely carry while it is being moved, supported on forklift tines, a pallet jack or a conveyor. It sits between the static rating and the racking rating.
- GlossaryLoad bridgingLoad bridging is the effect of a stiff unit load spanning across the pallet's weak points, so the packaged product carries part of the load and the pallet deflects and stresses less than it would under a flexible load of the same weight.
- GlossaryLoad capacityLoad capacity is the maximum weight a pallet can safely carry under a stated support condition. It is always quoted per condition: static (on the floor), dynamic (on forks or a pallet jack) and racking (spanning rack beams), and the racking figure is usually the lowest.
Last reviewed 2026-09-24. 250 words.