The standard pallet size in North America is 48x40 and has been for decades. This post will specifically shine a light on plastic pallets and six (6) sizes commonly sold in the US.
Source 4: The #1 Supplier of Warehouse & Material Handling
40 x 48 Nestable Heavy Duty Plastic FDA Pallet - Blue
Pallets and Industrial Packaging - Nelson Company Blog
Full Plan Download: Bar Height Adirondack Chair - Woodworking
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Transport Industry Blog - Pallets and Crates
Transport Industry Blog - Pallets and Crates
More Plastic Pallet Manufacturer Listings
Food Grade Plastic Industrial Pallet 48 x 40 - 8,800 lbs. Static
The Nelson Company (@TheNelsonCo) / X