How to read a pallet spec sheet: every field explained

A pallet spec sheet is the document that defines a pallet design precisely enough for any competent manufacturer to build it. In North America many are produced with the Pallet Design System (PDS), and buyers such as large retailers sometimes require one. Layouts vary by software and supplier, but the information is standard. This guide explains each field you will find and what to check.

#The four parts of a spec sheet

Drawings (top, bottom, side and end views) usually accompany the sheet and show positions, gaps, notches and nail locations.

#Identification fields

#Classification

The classification line summarizes the pallet in a fixed order: size, class, deck style, entry, use and manufacture. For example:

48.00 × 40.00, Stringer class, Double-face non-reversible, Partial 4-way, Reusable, New manufacture

Treatments usually follow: ISPM 15 heat treatment (HT) for export, and any conditioning such as kiln drying to a target moisture content.

#Component tables

Each component group has a small table of rows. Each row is a set of identical parts.

Top deck and bottom deck: number of boards, thickness, width, length. A GMA-style 48 × 40 top deck reads as two rows: 5 boards at 0.625 × 3.500 × 40.00 and 2 boards at 0.625 × 5.500 × 40.00. The deck type (new lumber, recycled, panel) and style (deckboards or panel) are listed too.

Stringers (stringer pallets): number, width, height, length. For example, 3 × 1.375 × 3.500 × 48.00.

Stringerboards and blocks (block pallets): number and size of each, plus block material and grain orientation.

Special features, listed under the component that receives them:

Deck spacing is either stated as a rule (for example "end boards flush, interior boards equally spaced") or shown by board positions on the drawing. On the GMA-style top deck, the leading edges are at 0, 8.75, 15.50, 22.25, 29.00, 35.75 and 42.50 in, giving equal 3.25 in gaps. See deckboard thickness and spacing.

#Dimensions are actual, not nominal

All dimensions on a professional spec are actual sizes at the time of manufacture, not lumber-yard nominal sizes. A deckboard listed at 0.625 in is 5/8 in thick, not a "1 × 4". The Uniform Standard for Wood Pallets sets manufacturing tolerances, for example about ±1/16 in on deckboard thickness and ±1/16 in on stringer width and height. See actual dimension.

#Volume (board feet)

Each component group shows its lumber volume, and the sheet shows a total. Board feet = thickness × width × length in inches ÷ 144, using actual sizes. The GMA-style example totals 13.5 board feet: 4.9 top, 3.7 bottom and 4.8 stringers. Notches are not deducted.

Board feet drive price, because most wood pallets are priced on lumber volume. They are not the lumber the mill buys: kerf, trim and culls are extra. The board feet calculator checks the arithmetic.

#Lumber

Species and grade drive strength and weight. See pallet wood species and pallet lumber grades.

#Fasteners

A fastener table lists one column per fastener type (block pallets often have three: deck mat, top-to-block, bottom-to-block).

See pallet nails and fasteners and MIBANT.

#The structural analysis

If the report includes an analysis, it restates the load assumptions, then lists results by support condition.

Read each safe load with its support condition. See pallet load capacity and racking and deflection.

#Other sections you may see

• Durability or service life: predicted trips before first repair and before replacement, for a stated handling severity.
• Physical properties: pallet weight at manufacture and at lower moisture contents, and expected shrinkage.
• Production order: cut list, board positions from each end, stringer positions and nails per joint, used on the plant floor.
• Unit load: box size, pattern and layers for a specific load.

#What to check before you approve a spec

1. Size and entry match your handling and racking.
2. Every board size and count matches what you asked for.
3. Lumber, grade and moisture meet your needs.
4. Nails are long enough and of adequate quality.
5. The analysis covers every support condition you use, with your actual load.
6. The revision is current.
7. The drawings agree with the tables: board positions, gaps, notch locations and nail patterns.

If anything is unclear, ask the supplier before approving a first article. Changes are cheap on paper and expensive after the first truckload.

Spec sheets from design software are usually copyrighted by their publisher, and some carry license watermarks. You own your requirements, though. The designer produces an independent spec sheet with a parts list and board feet that any manufacturer can quote from; open the 48 × 40 template to see one.