Anyone comparing rackable vs lockable pallets is usually trying to work out which one is safe to load onto pallet racking. It is a fair question, because the two terms get used loosely across the industry, and getting it wrong can mean a sagging beam, a damaged load, or worse.
A rackable pallet means a pallet whose manufacturer has specified a safe load for the relevant racking support arrangement, which may involve beams, rails, mesh decks or other approved supports. Lockable pallet is not a universal technical classification, so before you use one, confirm with the supplier whether they mean a nestable, stackable or interlocking pallet, and check its specific racking rating.
Below, we break down what separates rackable pallets from these other designs, when each one belongs in a warehouse, and how to check the right pallet is being used for a given racking system.
What is a rackable pallet?
A rackable pallet is engineered to bridge the gap between two rack beams without collapsing or sagging under its rated load. The deck and stringers (or bottom boards) are reinforced so the weight is distributed evenly across the unsupported span, rather than resting on solid ground or a shelf.
This matters because in many selective-racking arrangements, the pallet is supported by front and rear beams only, but the exact support conditions depend on the racking design and any fitted decks or supports. Everything spanning the open section has to hold itself up. A pallet that isn't built for this can flex, deform, or fail under load.
Manufacturers should state the conditions for any racking load rating, including the support arrangement, pallet orientation, load distribution and any relevant beam spacing or rail configuration. Do not rely on a generic beam-span range; obtain the actual dimensions and rated conditions from the racking and pallet suppliers. If a supplier can't tell you the rated load and support conditions, treat that as a red flag before you put it on a rack.
What is a lockable pallet, and how is it different?
Where a supplier uses the term 'lockable pallet', it may refer to a pallet with features intended to help align, nest or interlock during stacking or transport, usually for storage or transport rather than for sitting on rack beams. Confirm the actual construction and stacking function in the manufacturer's documentation; the term alone does not establish how the pallet performs.
Supplier terminology varies. Nestable, stackable and interlocking should not be treated as synonyms: check the pallet's construction, stacking limits, entry requirements and any beam- or drive-in-racking rating in the manufacturer's documentation.
This is a different engineering problem to rackable pallets. Lockable pallets are optimised for vertical stacking stability and space-saving storage, not for spanning open air between two beams. Many plastic pallets used for export or floor storage fall into this category.
It’s important to remember that lockable does not automatically mean rackable. A pallet can be excellent at stacking securely and still sag or fail if placed unsupported across rack beams it was never rated for.
Rackable vs lockable pallets: the key differences
Once you know what each term means on its own, the differences are easier to spot side by side. The table below breaks down how rackable and lockable pallets compare across purpose, load support, materials, and typical use case.
Note that CHEP pallets and Loscam pallets are designed primarily for pooled transport and general handling. Some models are rack-rated, but you should always confirm this with the pallet supplier rather than assuming, since not every pallet in a pooling scheme carries the same rating.
CHEP's own handling guides, for example, warn against racking pallets across their width and specify that pallets should only be racked the way the guide sets out.
How to tell if your pallet is rack-rated
There's no single label to check, so it usually comes down to a few quick verification steps before a pallet goes anywhere near a beam.
Check the manufacturer's specifications
Ask your supplier for the pallet's load rating and beam span, not just its overall capacity. A pallet's static load rating on a solid floor may be different from its rating when supported by beams or rails, so do not substitute one rating for the other.
Look for a rack safety label or stamp
Many rackable plastic pallets and heavy-duty timber pallets carry a stamped rating on the deck or block. If there's no label and no paperwork from the supplier, don't assume it's safe to rack.
Match the pallet to your beam span, not just your racking type
Two selective racking bays can have different beam spans depending on how the racking configuration was set up. A pallet rated for one support spacing may sag if placed across a wider spacing, even within the same warehouse. Use the exact support dimensions and conditions specified by the pallet and racking suppliers.
What happens if you use the wrong pallet on racking?
Using an unrated pallet on racking puts both your stock and your team at risk. Excessive deflection (the pallet bowing under load) can be a warning sign, but pallet failure may also occur suddenly because of impact, damage, defects, concentrated loading, incorrect positioning or overload.
Deflection and sag
Over time, a pallet that isn't built for its beam span will start to sag in the middle. Left unchecked, this deflection gets worse with every load cycle, and it puts uneven stress on the rack beams themselves.
Structural damage and overload
Overloading a pallet, or placing a rated pallet on a span it wasn't built for, can cause permanent deformation of the deck or stringers. Permanent deformation or other damage may reduce the pallet's remaining capacity — remove the pallet from service and have it assessed or replaced in accordance with the supplier's instructions.
Safety and compliance risks
A single rack collapse can cost an Australian warehouse a significant sum in damaged stock, equipment, and workers' compensation, on top of the human cost. Australian steel storage racking should be designed, operated and maintained in accordance with the applicable manufacturer's instructions, workplace-health-and-safety requirements and relevant parts of the AS 4084 series, including AS 4084.1:2023 for design and AS 4084.2:2023 for operation and maintenance (confirm the applicable requirements for your state or territory). WorkSafe Victoria notes that damaged or overloaded racking can be hazardous, and racking can collapse onto employees stacking pallets, causing serious injury or death.
Using the wrong pallet type is one of the more overlooked contributors to that risk, alongside forklift impact and poor housekeeping.
It's also worth noting how much of this damage comes down to handling rather than the pallet or rack itself. WorkSafe Victoria's forklift incident data shows that more than half of the 142 accepted forklift-incident claims in 2022 were made by forklift operators. This supports the need for safe systems of work and operator training, but it does not by itself establish the cause of each incident.
Pairing the right pallet with proper operator training is a sensible complement to a compliant racking system, not a substitute for it.
Which racking systems need rackable pallets?
Not every storage system puts the same demands on a pallet. Here's how the main types compare.
Selective racking
In selective pallet-racking systems, the pallet may be supported by front and rear beams, mesh decks, pallet supports or other approved components. Confirm the pallet's rating for the actual support arrangement and load before it goes on selective racking.
Drive-in and high-density racking
Drive-in and other high-density systems support pallets according to the specific rail, guide and pallet configuration, so the demands on the pallet can differ from selective racking. SafeWork SA points out that for uneven loads supported at only two or three points, you should check with the racking supplier to confirm the racking can support the load safely — the same principle applies to confirming the pallet itself. Always confirm with the racking and pallet suppliers that the pallet's bottom structure, orientation, dimensions and rated load are compatible with the exact system in use.
Cold storage racking
Cold storage adds another variable, since HDPE plastic pallets and timber can both behave differently at low temperatures, and the size and direction of any change depends on the material and design. When specifying pallets for a cold store, confirm the manufacturer's rated capacity at the warehouse's actual operating temperature and loading duration, and ask whether the rating changes during repeated temperature cycling.
Choosing between rackable and lockable pallets for your warehouse
A quick way to work through the decision:
- Going onto racking. Choose a rackable pallet with a published rating that matches your beam span.
- Stacking on the floor or loading for export. A lockable pallet with secure nesting feet is usually the better fit.
- Running a mixed operation. Some pallets are rated for both, but confirm this in writing with your supplier rather than assuming.
-
Handling equipment matters too. Confirm that the pallet's entry openings and dimensions are compatible with the forklift or pallet jack, aisle width and handling procedure — four-way entry may improve flexibility, but it is not a substitute for checking equipment compatibility.
For anyone unsure which category their current pallets fall into, a supplier who can talk through the load rating and beam span for the specific racking setup will save a lot of guesswork.
Getting the right pallet for your racking
A pallet-racking mismatch is one possible cause of racking problems. At Top Pallets, we talk suppliers through the difference between rackable and lockable pallets before they order. Confirm the pallet, load and racking specifications for your beam span and how your warehouse actually operates day-to-day, rather than assuming a pallet will fit.
Whether the project involves selective racking, drive-in racking, or a cold storage system, it is worth confirming the load rating and beam span in writing rather than assuming a pallet will fit. Confirming these details with the pallet and racking suppliers before use can help reduce the risk of incompatible equipment and damaged stock.
Frequently asked questions
How do I calculate the maximum weight a rackable pallet can hold on warehouse beams?
Do not calculate the maximum load by multiplying a rating by beam span — pallet ratings are test- or engineering-specific and don't scale linearly. Use the pallet manufacturer's published rating for the exact support arrangement, orientation, load distribution and operating conditions, and separately confirm that the unit load, beam level and bay remain within the racking supplier's safe working loads.
Why do plastic pallets sag when placed on selective racking systems?
Plastic-pallet deflection depends on the pallet's material, geometry, ribbing or reinforcement, load, support arrangement, temperature and duration of loading, not on internal steel reinforcement alone. Use a model with a manufacturer-published rating for the exact racking application; do not rely on the material name alone.
Can I stack lockable export pallets inside high-density drive-in racking?
Do not place a nestable, stackable or interlocking export pallet in drive-in racking unless the pallet manufacturer and racking supplier confirm that its dimensions, bottom structure, orientation and rated load suit the specific rails and support conditions. Some designs may be suitable for a particular system; others will not be, so check before use rather than assuming.
What causes wooden pallets to fail during cold storage operations?
Cold-storage conditions can affect pallet performance, but the outcome depends on the pallet material, moisture exposure, design, load and temperature range — freezing does not automatically make timber brittle or unsafe. Use a pallet whose manufacturer provides a rating for the actual operating conditions, and confirm whether the rating changes at low temperature or during repeated temperature cycling.
How do forklift operators prevent accidental pallet damage in narrow aisles?
Operators prevent damage by mastering precise mast alignment and avoiding high-speed impacts with rack uprights. Operators should receive site-specific training and supervision covering load limits, alignment, clearances, pedestrian controls and the correct placement and retrieval method, and employers should verify competence and investigate impacts or near misses. Proper equipment handling directly protects both inventory and employee safety.
Are pooled timber pallets like CHEP safe for standard pallet racking?
Pooled timber pallets are primarily engineered for transport pooling rather than guaranteed overhead rack safety. Some pooled pallet models have published racking ratings and others may have different restrictions. Check the exact pallet model, orientation, load, support arrangement and current specification with the pooling provider before use.
What is the safest way to store mixed inventory across different rack spans?
Inventory safety relies on matching individual pallet load limits to the exact dimensions of each storage bay. Since beam lengths vary across facilities, a pallet safe on a short span may fail on a wider one. Labelling bays clearly helps warehouse staff verify compatibility instantly.
How often should warehouse managers review pallet load ratings against safety compliance?
Review pallet and racking ratings whenever the pallet type, load, temperature, racking configuration or handling equipment changes, and during routine inspections. For standard selective racking, WorkSafe Victoria's guidance recommends a formal inspection by a competent person every 12 months; confirm the applicable state or territory requirements and manufacturer instructions. Regular safety audits protect workers from hazardous workplace collapses.