Wood Stringer Pallets

What Are Wood Stringer Pallets?

Wood stringer pallets are the most widely used pallet type in North America, accounting for approximately 80% of all pallets manufactured in the United States. They derive their name from the "stringers" — the long, parallel boards running between the top and bottom deck boards that provide structural support and create the spacing needed for forklift entry.

A standard stringer pallet uses either two or three stringers (three being the most common configuration) made from 2x4 or 3x4 lumber, with deck boards nailed or stapled across the top and often the bottom as well. This simple yet effective design has made the stringer pallet the workhorse of American logistics for over 80 years.

Construction and Design Details

The typical wood stringer pallet consists of several key components. The top deck boards are the load-bearing surface where goods are placed, typically made from hardwood or softwood lumber ranging from 5/8" to 3/4" thick and 3.5" to 5.5" wide. These are secured to the stringers using helically threaded nails, ring shank nails, or pneumatically driven staples.

The stringers themselves are the main structural members, usually measuring 1.5" x 3.5" (2x4 nominal) for lighter loads or 2.5" x 3.5" (3x4 nominal) for heavier applications. Some stringer pallets feature notched stringers — semicircular cutouts in the side stringers that allow partial four-way fork entry, though this does reduce the overall strength compared to un-notched designs.

Bottom deck boards (also called bottom runners or bottom lead boards) provide stability and distribute weight when the pallet is resting on a surface. Some economy pallets may omit bottom boards entirely (known as single-face pallets), while heavy-duty versions may have full bottom decks.

Manufacturing Process

Manufacturing wood stringer pallets is a relatively straightforward process. Lumber is first cut to the required dimensions using gang rip saws and cut-off saws. The components are then assembled using pneumatic nailers on manual, semi-automatic, or fully automatic nailing machines. A skilled crew using a semi-automatic nailing system can produce 300-500 pallets per shift, while fully automated lines can produce 1,000+ pallets per hour.

The lumber used for stringer pallets comes from a variety of species. Softwoods like southern yellow pine, spruce, and fir are popular for their low cost and light weight, while hardwoods like oak, maple, and poplar are chosen when greater strength and durability are required. Many pallet manufacturers use a mix of species depending on availability and customer requirements.

ISPM-15 and Heat Treatment

For international shipping, wood stringer pallets must comply with ISPM-15 (International Standards for Phytosanitary Measures No. 15), which requires the wood to be heat treated to a core temperature of 56°C (132.8°F) for at least 30 continuous minutes, or alternatively treated with methyl bromide fumigation (though this option is being phased out in many countries). Compliant pallets are stamped with the IPPC mark indicating the treatment method and country of origin.

Industries and Use Cases

Wood stringer pallets serve virtually every industry in the domestic supply chain. In the food and beverage sector, they transport everything from canned goods to bottled water. In retail, major chains like Walmart and Home Depot receive millions of stringer pallets annually through their distribution networks. The pharmaceutical industry uses them for transporting non-temperature-sensitive products, while the construction industry relies on them for moving building materials, hardware, and tools.

The agricultural sector is another major user, with stringer pallets moving produce, grain, feed, and fertilizer across the country. Manufacturers of consumer goods, electronics, automotive parts, and industrial equipment all depend on stringer pallets for their daily shipping operations.

Cost Considerations

New wood stringer pallets typically cost between $7 and $15 per unit, depending on the size, lumber species, and construction quality. The standard 48x40 GMA stringer pallet in softwood might cost $7-$10, while a heavy-duty hardwood version could run $12-$15. Recycled or reconditioned stringer pallets are available for $4-$8, making them an extremely cost-effective option for budget-conscious shippers.

When factoring in the total cost of ownership, stringer pallets are difficult to beat for one-way or limited-use applications. However, for closed-loop systems where pallets make many trips, the cost of repairs and the shorter lifespan compared to block or plastic pallets may make alternatives more economical over time.

Repair and Refurbishment

One of the greatest advantages of wood stringer pallets is their repairability. Broken deck boards can be replaced individually, split stringers can be reinforced with companion boards, and loose nails can be re-driven. A typical repair costs $1-$3 per pallet, making it far cheaper than purchasing new. The pallet recycling industry in the United States repairs and resells over 400 million pallets annually, keeping costs low and waste minimal.

Environmental Impact and Sustainability

Wood stringer pallets have a favorable environmental profile. Wood is a renewable, carbon-sequestering material, and the pallet industry is one of the largest recyclers in the world. At end of life, pallets that can no longer be repaired are ground into mulch, animal bedding, composting material, or biomass fuel. Studies by Virginia Tech have shown that the recycling rate for wood pallets in the U.S. exceeds 95%, making them one of the most recycled products in the country.

Many pallet manufacturers source their lumber from sustainably managed forests, and certifications like FSC (Forest Stewardship Council), PEFC (Programme for the Endorsement of Forest Certification), and SFI (Sustainable Forestry Initiative) provide third-party verification of responsible sourcing practices.