Stringer vs Block Pallets: Which One Is Right for You?

Two Fundamental Pallet Designs

Every wooden pallet falls into one of two basic construction categories: stringer pallets and block pallets. The difference lies in the structural framework that supports the deck boards. Understanding this distinction is essential for selecting the right pallet type for your storage, shipping, and handling requirements.

Stringer pallets use two or three long boards, called stringers, running parallel along the length of the pallet to form the primary structural support. Deck boards are then nailed across the top and bottom of these stringers. Block pallets use solid wood blocks positioned at the four corners, at the midpoint of each side, and in the center, with stringerboards and deck boards spanning between the blocks.

Both designs have been in use for decades and each has distinct advantages. The choice between them often comes down to how pallets need to be accessed by material handling equipment, the weight and type of products being shipped, and the specific requirements of your supply chain partners.

Stringer Pallets: The North American Standard

Stringer pallets are by far the most common pallet type in North America. The standard 48x40 GMA pallet is a stringer pallet, which means the overwhelming majority of pallets you encounter in US warehouses and on US trucks are of this design. Their dominance is rooted in simplicity, material efficiency, and lower manufacturing cost.

A typical stringer pallet uses three stringers: one on each side and one in the center. The stringers are usually 2x4 or 3x4 lumber, while the deck boards are 1x-dimensional lumber of varying widths. This construction is straightforward, uses less wood than a block pallet, and is fast to assemble, which keeps the price competitive.

The primary limitation of stringer pallets is that they are inherently two-way entry in their basic form. Forklifts can fully engage the pallet only from the two open ends where the forks slide between the stringers. Partial four-way entry can be achieved by cutting notches into the stringers on the long sides, allowing a forklift to partially enter from those sides, but this is not true four-way access and can weaken the stringers.

Block Pallets: Superior Access and Strength

Block pallets are built around nine or more solid wood blocks that serve as both the vertical spacers and the primary load-bearing elements. These blocks create openings on all four sides of the pallet, providing true four-way forklift entry without any modifications or compromises to structural integrity.

The four-way entry capability is the single biggest advantage of block pallets. In warehouses and distribution centers where space is tight and pallets need to be accessed from any direction, block pallets offer significantly more flexibility. They are also compatible with all types of material handling equipment including forklifts, pallet jacks, and automated guided vehicles.

Block pallets generally have higher load capacities than comparable stringer pallets because the blocks distribute weight more evenly across the pallet's footprint. A typical block pallet can support 20 to 30 percent more weight in a static stacking scenario compared to a same-size stringer pallet. This makes block pallets the preferred choice for heavy products and high-rack storage applications.

The European market strongly favors block pallets. The EUR pallet, the dominant standard in European logistics, is a block pallet design. Companies that ship to European customers or participate in European pallet pooling programs will likely need to use block pallets.

Load Capacity and Structural Comparison

Static load capacity measures how much weight a pallet can support while sitting stationary on the floor or on a flat surface. Stringer pallets in the 48x40 GMA configuration typically handle 2,500 to 4,600 pounds in static load. Block pallets of the same dimensions can support 4,000 to 6,000 pounds or more due to the distributed block support system.

Dynamic load capacity, the weight a pallet can support while being lifted and moved by a forklift, is typically 60 to 70 percent of the static capacity for both designs. Racking capacity, the weight supported when the pallet spans across warehouse rack beams, is the most demanding scenario and is where block pallets show their greatest advantage.

In racking, the load is supported only by the edges of the pallet that rest on the beams. Block pallets, with their additional blocks at the midpoints and center, distribute the racking load more effectively than stringer pallets. For heavy products stored in selective or drive-in racking, block pallets provide a measurably higher safety margin.

Cost Considerations

Stringer pallets are less expensive to manufacture than block pallets. They use fewer components, require less labor to assemble, and consume less wood per unit. A new 48x40 stringer pallet typically costs $11 to $18, while a comparable block pallet runs $15 to $25 depending on quality and regional lumber costs.

The price difference is amplified in the recycled market. Recycled stringer pallets are abundant and inexpensive because they dominate the US market by volume. Recycled block pallets are less commonly available domestically, which means higher prices and potentially longer lead times.

However, the total cost of ownership should factor in durability and repairability. Block pallets tend to last longer because the blocks are more resistant to forklift damage than stringers. When a block is damaged, it can be replaced individually without scrapping the entire pallet. Over multiple use cycles, the longer lifespan of a block pallet can offset its higher initial cost.

Industry Preferences and Use Cases

The grocery and consumer packaged goods industry in North America overwhelmingly uses stringer pallets in the 48x40 GMA format. This is driven by decades of standardization, the massive installed base of compatible equipment, and the cost advantage of stringer construction. Switching to block pallets in this sector would require fundamental changes to infrastructure that no single company can justify.

The beverage industry often prefers block pallets due to the heavy weight of bottled and canned beverages and the need for four-way access in crowded warehouse environments. Block pallets are also common in the automotive, chemical, and pharmaceutical industries where load weights are high and handling flexibility is valued.

International shipping almost always calls for block pallets because of European and Asian market preferences. If your pallets need to function in overseas warehouses, block pallets will integrate seamlessly with the local material handling infrastructure. Pallet pooling companies like CHEP and PECO use block pallet designs for their rental fleets.

Making Your Decision

For most domestic US shipping applications, especially in retail and grocery supply chains, stringer pallets are the default choice. They are cheaper, more widely available, and compatible with the existing infrastructure of virtually every warehouse in the country.

Choose block pallets when you need true four-way forklift access, when load weights exceed the comfortable capacity of stringer pallets, when shipping to European or international markets, or when pallets will be used in automated systems that require consistent block-style entry points.

If you are unsure which type is right for your operation, consult with your pallet supplier. At Pallet Colorado, we carry both stringer and block pallets in new, recycled, and heat-treated configurations. We can evaluate your specific requirements and recommend the most cost-effective solution.