A pallet block placed at the center of a block pallet for additional load support.
Detailed Definition
The center block sits under the middle of a block pallet, where the center lines of the pallet cross. In the common nine-block layout it is surrounded by four edge blocks and four corner blocks, and the middle stringer board runs across it. The center block supports the part of the deck that would otherwise sag most under a uniform load, and it ties the middle stringer board to the bottom deck. It is usually the same height as the other blocks so the pallet sits flat, though its length and width may differ by design.
What the center block does under load
When a pallet carries a load spread across its deck, the middle of the pallet is the farthest point from the edges and tends to deflect most. The center block gives that area a direct path to the floor or to the bottom deck. Its role grows when the pallet is lifted by forks or rests on rack beams, because the deck then spans between supports. A weak, split or missing center block lets the middle of the deck sag, which can crush cases, cause load shifts and reduce the pallet's rated capacity.
Inspecting and repairing center blocks
Center blocks are harder to see than corner blocks, so damage can be missed during quick sorting. Look for:
- Splits that run through the nailing area
- Nails pulled through or missing where the stringer board and bottom deck attach
- Composite blocks that are crumbling or swollen from water
- A block that is twisted or shorter than its neighbors
Replacement blocks should match the original height and material so the pallet stays flat and level during repair.
Related Glossary Terms
Frequently Asked Questions
Does every block pallet have a center block?
Most common block pallets, including the nine-block layout used for EUR pallets and many pooled pallets, have a center block. Some designs use different block counts or longer blocks, so the arrangement is not universal. Check the pallet drawing or specification. If a pallet you are buying lacks a center block, ask how the design supports the middle of the deck and what capacity it is rated for.
Can a pallet with a damaged center block still be used?
It depends on the damage and the load. A small surface split may not matter, but a split block, loose nails or a crushed composite block weakens support under the middle of the deck. For heavy loads, racking or automated handling, the safest choice is to repair the block before reuse. Many operations set sorting rules that send any pallet with a damaged block to repair rather than back into service.